2012 Program CORDILLERAN. GSA Section Meeting March Vol. 44, No. 3 Misión Hotel Juriquilla Querétaro, México

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1 2012 Program CORDILLERAN GSA Section Meeting March 2012 Vol. 44, No. 3 Misión Hotel Juriquilla Querétaro, México Sp e c t a c u l a r sk Ph o t o b i e s ov e r Q u e r y Mi c h é e l a n g e t a r o, Mé x i c o. l o Ma r ti n i.

2 108 th Annual Meeting Cordilleran Section of The Geological Society of America Hosted by Centro de Geociencias and Instituto de Geología Universidad Nacional Autónoma de México Cordilleran Section GSA Officers for 2012 Chair:.... Calvin G. Barnes Past Chair:.... Luca Ferrari Vice Chair:... Jonathan S. Miller Secretary-Treasurer:.... Rodney V. Metcalf Local Committee for the 2012 Meeting General Chair.... Luca Ferrari General Co-Chair... Teresa Orozco Esquivel Technical Program Chair....Dante Morán Zenteno Field Trips Chair.... Jorge Aranda Gómez Student Volunteers Coordinator.... Mariano Cerca Martínez Exhibits Chair....Claudia Mendoza Sponsorships/Donations....Elena Centeno García GSA Abstracts with Programs 50% Total Recovered Fiber 10% Post-Consumer

3 General Information Welcome to the 108 th annual meeting of the Cordilleran Section of The Geological Society of America, hosted by Centro de Geociencias and Instituto de Geología of the Universidad Nacional Autónoma de México. The meeting theme The Southern Cordillera and Beyond emphasizes the fact that geology does not stop at the U.S. border. Canada, the United States, and Mexico share the same tectonic plate and also face similar environmental and resource problems. In an effort to promote a more active communication among geologists from the three countries, the 108th meeting of the GSA Cordilleran Section is being held in Querétaro, central Mexico, at Hotel Misión Juriquilla. Querétaro lies at the crossroads of three main geologic provinces: the Neogene Trans-Mexican Volcanic Belt, the mid-tertiary Sierra Madre Occidental silicic large igneous province, and the Cretaceous-Paleocene Sierra Madre Oriental fold-thrust belt. The urban area occupies a continental basin bounded by the intersection of two late Tertiary extensional fault systems affecting late Miocene and early Pliocene volcanic rocks. Classic fossils sites with Hemphillian to Blancan vertebrate fauna are located only miles to the north. Mexico is a key region for understanding the geologic evolution of North America as well as an important tectonic element that interacted with South America and the Caribbean. The meeting will focus on the advances in the geology of the Southern Cordillera, including such topics as silicic magmatism, rifting of the Gulf of California and Gulf of Mexico, the Laramide fold and thrust belt, the Trans- Mexican Volcanic Belt and the Middle America subduction zone, and Caribbean interaction with North and South America. The meeting will also host a symposium on the Amalgamation and Breakup of Pangea (IGCP Project 597), along with an array of applied theme sessions on water management, soils subsidence and fracturing, ore geology, and geothermics. Venue Located in the geographic center of Mexico, Querétaro is a modern industrial city, built around a beautiful colonial center. The meeting is being held at Hotel Misión Juriquilla, which occupies the main building of an 18 th century hacienda and includes large patios, two restaurants, a pool, and a spa. The hotel is located just 15 km away from the historic downtown, which was declared a World Heritage Site by UNESCO, for the exceptional examples of baroque architecture and for having retained the geometric street plan of the Spanish conquerors side by side with the twisting alleys of the Indian quarters. Transportation and Directions Querétaro is located 140 miles northwest of Mexico City. The Querétaro International Airport has direct flights from Houston (Continental), Dallas (American), and Monterrey, Mexico (AeroMexico). Taxi fare from the Querétaro airport to Hotel Misión Juriquilla is ~US$25. A direct shuttle bus connects Mexico City International Airport to Querétaro s bus station for ~US$22 (see primeraplus.com.mx). Hotel Misión Juriquilla is located 15 km north of Querétaro city, off the Juriquilla exit of Highway 57. Taxi fare from Queretaro downtown to Hotel Misión Juriquilla is ~$US 8. Free bus transport between Querétaro downtown and Hotel Misión Juriquilla is provided during the meeting. In downtown, bus departs from the Alameda (at the corner of Corregidora and Constituyentes) following a route along Constituyentes Av., and 5 de Febrero Av. (see map). If you plan to use this bus transport, please contact Teresa Orozco, Bus time schedule: Downtown- Juriquilla- Juriquilla Downtown Wednesday, 28 4 p.m. 8:15 p.m. Thursday, 29 7:45 a.m. 6:45 p.m. Friday, 30 7:45 a.m. 6:45 p.m.*/ 8:45 p.m.** Saturday, 31 7:45 a.m. 1:15 p.m. * For people attending the Keynote Address, bus will stop at UNAM Campus before riding to Querétaro downtown. ** Bus will depart from UNAM Campus and will stop at Hotel Misión Juriquilla before riding to Querétaro downtown. Accommodations A block of rooms is reserved at a discounted rate at the Hotel Misión Juriquilla, Blvd. Villas del Mesón 56, Juriquilla, Querétaro. To qualify for special meeting rates, please identify yourself as a GSA attendee. Reservation can be made by phone +52 (442) , or online at Home.aspx?Preserve=1, using the promotional code GSA. Information about other hotels is available on the web site of the Querétaro Tourism Office: To avoid transport problems, we suggest staying in the meeting hotel or in Querétaro downtown, from where free bus transport will be offered GSA Cordilleran Section Meeting 29

4 Hotel Misión Juriquilla Plaza Amarras Commercial areas with restaurants Banks Villas del Mesón Plaza Juriquilla Route from Querétaro to San Luis Potosí Blvd. Juriquilla UNAM Campus Centro Académico y Cultural, UNAM MEX m 500 ft Juriquilla Lake Plaza Naútica 1. Registration 6. Mariposa 1 (upstairs) 2. Gobernador 6. Mariposa 2 3. Goyesco 1 7. Siglo XVIII 4. Juárez Juárez 3 8. Siglo XVIII annexe 9. Parián Plaza del Claustro 4 5 Chapel 2 1 Corridor Parking Plaza El Pueblito GSA Abstracts with Programs

5 Dining Hotel Misión Juriquilla houses two restaurants; the Aranjuez and the Mavericks. Also, a variety of restaurants and bars are located within walking distance from the hotel (see map). The Centro Académico Cultural at UNAM Campus (~1.5 km away) has an inexpensive dinning facility. Registration Registration is required to participate in any event at the meeting, including technical sessions, symposia, field trips, exhibits, special meetings, and planned social events. Registration badges must be worn for access to all activities, and guest registration is required for attendance at the welcoming reception, scheduled lunches, and field trips. A current student ID is required to obtain student registration rates. On-site registration and badge pick-up is located in corridor in front of Juárez 1 room, and is open at the following times: Wednesday, 28 March Thursday, 29 March Friday, 30 March Saturday, 31 March 2 7 p.m. 8 a.m. 6 p.m. 8 a.m. 6 p.m. 8 a.m. noon On-site Registration Fees (US dollars) Type Full Meeting One-Day Professional member... $190...$110 Professional member $120...n/a Professional non-member... $210...$170 Student member... $80...$55 Student non-member... $100 Guest... $80 Field Trip only... $35 Cancellations, Changes, and Refunds Requests for cancellations must have been received in writing at GSA Headquarters by 5 March No refunds will be made on cancellation notices received after this date. Refunds will be mailed from GSA after the meeting; refunds for fees paid by credit card will be credited to the card identified on the registration form. GSA cannot provide refunds for on-site registration, the Abstracts with Programs book, and event ticket sales. Student Volunteers All student volunteers are required to check in with the Student Volunteer Coordinator Mariano Cerca in the Speaker Ready Room (Gobernador Room) or at the GSA registration desk in the corridor in front of Juárez 1 room. Training for volunteer activity is included in the required six- hour shift and is taking place on Wednesday at noon in Mariposa 1 Room. Welcoming Reception The welcoming reception will be held Wednesday 28 March, 6-8 p.m. in the Parián at Plaza El Pueblito. Student posters and exhibit booths will be open from the first hour of the welcoming reception (5-9 p.m.). Hors d oeuvres and one complimentary drink at the opening reception are included with each registration. A cash bar will also be available. Exhibits Exhibits are located in the Juárez 1-2 Room, and are open at the following times: Wednesday, 28 March Thursday, 29 March Friday, 30 March Saturday, 31 March 5 7 p.m. (exhibits opening) 8:30 a.m. 6 p.m. 8:30 a.m. 6 p.m. 8:30 a.m. 1 p.m. Undergraduate and Graduate Student Presentation Awards To recognize exceptional work, the Cordilleran Section is offering awards for outstanding oral and poster presentation to both graduate and undergraduate students. Mentoring programs Sponsored by the GSA Foundation. For more information, contact Jennifer Nocerino at Roy J. Shlemon Mentor Program in Applied Geoscience. Thursday, 29 March 2012, 1 2:30 p.m. Room Siglo XVIII annexe. This program is designed to extend the mentoring reach of individual professionals from applied geology to undergraduates and graduate students attending GSA Section Meetings. Over free lunches, mentors and students discuss professional opportunities and challenges that await students after graduation. Every registered student receives a ticket to the Shlemon Luncheon along with his/her badge. Please arrive early as attendance is limited to the space available. The John Mann Mentors in Applied Hydrogeology Program. Friday, 30 March 2012, 1-2:30 p.m. Room Siglo XVIII annexe. The Mann Mentors in Applied Hydrogeology Program presents mentoring opportunities for undergraduate and graduate students as well as recent graduates with a declared interest in applied hydrogeology as a career to interact and network with practicing hydrogeology professionals. This relaxed but focused small-scale event features a free lunch for student(s) and mentors. Every student receives a ticket to the Mann Luncheon along with his/her badge. Please arrive early as attendance is limited to the space available. GSA Town Hall Meeting. Thursday, 29 March, 5:30 6:30 p.m. Room Siglo XVIII. All meeting attendees are invited to this event to discuss the the Society s future. Moderated by a member of the GSA Executive Board. Learn more about GSA and GSA s strategic plan at aboutus/index.htm. A cash bar is available GSA Cordilleran Section Meeting 31

6 Cordilleran Section GSA Annual Business Meeting. Friday, 30 March, 5:30 6:30 p.m. Mariposa 2 room. All Cordilleran members are invited to meet the management board in this annual meeting where the new chair is appointed for the period. Technical Sessions The technical program consists of a symposium, theme sessions and general discipline sessions. Sessions are scheduled for oral and poster presentations beginning 8:30 a.m. Thursday, 29 March, and concluding at 12:50 a.m. Saturday, 31 March. All oral and poster sessions are in the Conference area of Hotel Misión Juriquilla. Most of the oral sessions consist of 20-minute presentations, which includes ~17 minutes for the presentation and 3 minutes for questions/discussion. Session chairs are requested to strictly adhere to the schedule and to limit speakers to the allotted times. In all sessions, only one laptop computer running Windows 7 with PowerPoint 2007 software, one projector, and one screen will be provided. Speakers will not be able to use their own computers for presentations. Posters are displayed according to this schedule for the date assigned: Wednesday from 5 to 6:30 p.m., Thursday or Friday from 8:30 a.m. to 6:30 p.m. Authors are present at their posters from 5 to 6:30 p.m. on Wednesday and from 4:30 to 6:30 p.m. on Thursday or Friday. Any posters remaining after 6:30 p.m. will be discarded. Poster presenters will have one 1.2 m x 1.8 m vertical display board. Electrical hookups will not be available for poster boards. Speaker Ready Room. Gobernador room is serving as the speaker ready room. Student volunteers are staffing the speaker ready room and providing assistance for uploading presentations. Each speaker should bring their PowerPoint presentation to the speaker ready room on either a CD-ROM disk or on a USB drive according to the schedule listed below. Speaker Ready Room Schedule Wednesday, 28 March 3 6 p.m. Thursday, 29 March 8 a.m. 5 p.m. Friday, 30 March 8 a.m. 5 p.m. Saturday, 31 March 8 a.m. 11 a.m. For morning sessions, please have your presentations loaded the afternoon before the talk by 5 p.m. For afternoon sessions, please have your presentations loaded by noon on the day of the talk. All speakers should double-check their presentations in the Speaker Ready Room, especially speakers who created their talks on a Macintosh and converted it to run on Windows. Cameras, Sound Equipment, and Smoking Policy GSA meeting policy prohibits the use of cameras or sound recording equipment at technical sessions. The Conference area of Hotel Misión Juriquilla is a smoke-free facility and the local committee has adopted a no-smoking policy for all meeting rooms, session rooms, eating areas and exhibit areas. Keynote Address Joaquín Ruiz, University of Arizona and Past President of GSA, Isotopic Studies of Hydrocarbon Systems. Auditorium of Centro Académico Cultural del Campus UNAM Juriquilla, 7 8 p.m. Hors d oeuvres and complimentary drinks will be served at the end, courtesy of UNAM. Symposium S1. Amalgamation and Breakup of Pangæa in the Americas. Co-sponsored by IGCP 597 (Origin and Evolution of Pangea) and IGCP 574 (Bending and bent orogens, continental ribbons). Brendan Murphy, St. Francis Xavier University, Jarda Dostal, Saint Mary s University, Damian Nance, University of Ohio, Theme sessions T1. Silicic Volcanism. Cathy Busby, Graham Andrews, both at University of California at Santa Barbara. T2. Ore deposits and Ore Genesis in the American Cordillera. Antoni Camprubi, Instituto de Geología, UNAM, T3. Convergent Margin of Western Pangea: Triassic- Jurassic Magmatism, Sedimentation and Tectonics from Colombia to Oregon. Timothy Lawton, New Mexico State University, Rafael Barboza-Gudiño, Universidad Autónoma de San Luis Potosí, México, Roberto Molina-Garza, Centro de Geociencias, UNAM, T5. Mechanisms of Arc Magma Generation along the Cordillera. Laura Mori, Instituto de Geología, UNAM, Peter Schaaf, Instituto de Geofísica, UNAM, Arturo Gómez Tuena, Centro de Geociencias, UNAM, geociencias.unam.mx. T6. Terrane Accretion, Flat Slab Subduction, and Convergence Rate Variations: What Caused the Cretaceous- Paleogene Shortening across the Mexican Cordillera? Michelangelo Martini, Instituto de Geología, UNAM, Mariano Cerca, Centro de Geociencias, UNAM, Martín Valencia, Instituto de Geología, UNAM, geologia.unam.mx; Elisa Fitz Díaz, University of Michigan, Ann Arbor, Gabriel Chavez-Cabello, Universidad de Nuevo León, Linares, Timothy Lawton, New Mexico State University, nmsu.edu. T8. Lithosphere Stretching and Magmatism Leading to the Gulf of California. Luca Ferrari, Centro de Geociencias, UNAM, Arturo Martin Barajas, CICESE, Joann Stock, California Institute of Technology, T9. What Fossil Ages and Distributions Tell Us about the History of the Ancient Gulf of California. Judy Terry Smith, Smithsonian Institution, National Museum of Natural History; Judith Smith, GSA Abstracts with Programs

7 Ana Luisa Carreño, Instituto de Geología, UNAM, Javier Helenes, CICESE, T10. The Caribbean Plate and its Geologic Connections with North and South America. Luigi Solari, Centro de Geociencias, UNAM, Uwe Martens and Jim Pindell, Tectonic Analysis Ltd., zoho.com. T11. Developments in Geophysical Investigations of Volcano Hydrothermal Systems: Exploration and Hazards. Jonathan M.G. Glen, Shaul Hurwitz, both at U.S. Geological Survey; Vyacheslav M. Zobin, Universidad de Colima, Robert A. Sohn, Woods Hole Oceanographic Institution, T12. Limnogeology Studies and Paleoenvironmental Records from Ancient and Modern Lakes. Beatriz Ortega, Margarita Caballero, geofísica.unam.mx, both at Instituto de Geofísíca, UNAM; Socorro Lozano, Instituto de Geología, UNAM, servidor.unam.mx. T13. Heterogeneous Geologic Formations: Modeling Spatial Variability. Eric Morales Casique, Instituto de Geología, UNAM, Martín Díaz Viera, Instituto Mexicano del Petróleo, T14. Ground Deformation Related to Anthropogenic Activities: Achievements in the Development of Geoscientific Information Systems for Improved Management of Natural Resources. Dora Carreón-Freyre, Mariano Cerca, geociencias.unam.mx, both at Centro de Geociencias, UNAM; Devin Galloway, US Geological Survey, usgs.gov; Penélope López-Quiroz, Centro de Investigación en Geografía y Geomática, T16. Undergraduate Research Posters. Co-Sponsored by the Council on Undergraduate Research (CUR). Kathleen D. Surpless, Trinity University, San Antonio, Texas, trinity.edu. T17. Environmetal Geochemistry. Mario Villalobos, Laura Beramendi, geologia.unam.mx; Francisco Romero, geologia.unam.mx; Priyadarsi Roy, Instituto de Geología, UNAM; Ofelia Morton, Instituto de Geofísica, UNAM, General Discipline Sessions Oral Structural Geology and Tectonics Poster sessions Structural Geology and Tectonics Geochemistry and Petrology of Igneous Rocks Geophysics and Seismology Stratigraphy and Sedimentology Paleontology Volcanology Field Trips 1. Late Paleozoic Early Mesozoic of the Acatlán and Ayu Complexes, Southern Mexico: Events on the Periphery of Pangæa Synchronous with Amalgamation and Breakup. Co-sponsored by IGCP 597: Amalgamation and Breakup of Pangea. Duncan Keppie Instituto de Geología, UNAM; Brendan Murphy, Gonzalo Galaz, Moritz Kirsch, and Maria Helbig. Sat. Tue., 31 March 3 April. US$588. Field trip starts in Querétaro and ends either at a Mexico City airport hotel (night of the 3 rd April plan to fly out on the 4 th April) or at Querétaro airport at noon on the 4 th April. This field trip in the Acatlán Complex of southern Mexico will examine the geological record of an orogen on the western periphery of Pangea: 1) Triassic-Jurassic deposition of a clastic sequence intruded by tholeiitic mafic dikes that underwent high-grade metamorphism and migmatization and exhumation on the western margin of Pangæa; 2) Late Carboniferous Early Permian synchronous arc magmatism and pull-apart basin sedimentation followed by Triassic thrusting on the western periphery of Pangæa; 3) A Devonian-Permian sequence synchronous with Carboniferous extrusion of high-pressure rocks into the upper plate above a subduction zone on the western periphery of Pangæa. 2. The Late Cretaceous Mexican Fold-and-Thrust Belt and its Possible Relation with the Accretion of the Guerrero Terrane. Michelangelo Martini geologia.unam.mx), Elisa Fitz, Timothy Lawton. Sun. Tue., 1 3 April. US$344. The fieldtrip will provide a comprehensive overview of the Mexican Fold-Thrust Belt (MFTB) in the Sierra Madre Oriental of central Mexico, and the possible suture belt of the Guerrero Terrane in the Sierra de Guanajuato. During the first two days we will visit the Sierra Gorda and Tolimán area in Querétaro state with spectacular landscapes, and excellent exposure of the MFTB structures. Aspects on the regional structure, syn-tectonic sedimentation, deformation style, shortening gradients, temperature and timing of deformation will be addressed during the first day of the field-trip. During the second day we will observe changes in the Cretaceous stratigraphy and structure as we move to the western edge of the MFTB in the Tolimán area. We will discuss the tectonic setting of the Tolimán rocks and of their secondary structures. During the third day of the trip we will move to the Guanajuato area, where we have the opportunity to observe the suture belt between the Guerrero and Sierra Madre terranes. This belt is a ~70 km-wide deformation zone, where continent-recycled meta-sedimentary rocks of the Sierra Madre terrane overthrust arc-recycled meta-sedimentary rocks of the Guerrero Terrane. Based on the fieldtrip geologic observations we can discuss the possibility that the Guerrero Terrane accretion triggered the Late Cretaceous MFTB of the Sierra Madre Oriental. 3. Environmental Geochemistry of the Pozos Mining District, Guanajuato, East-Central Mexico. Alejandro Carrillo Juventino Martínez, Gilles Levresse. Wed., 28 March. US$ GSA Cordilleran Section Meeting 33

8 The participants will explore the Mining District of Mineral de Pozos and its environmental aspects (mine tailings deposited without any environmental concern whatsoever). This historical mining site is one of the oldest in Mexico, beginning in the 1600 s. The exploitation was focused on silver and gold in the sulfur-rich epithermal veins hosted by deformed Jurassic and Cretaceous sedimentary rocks. The site was abandoned by early 1940 s, with a Bonanza between 1892 and We will visit several ancient exploitation Haciendas, which look more as ghost places, than exploitation plants. Have your camera ready for shoots into the past from this, once very active and economical center of central-east Mexico. The field trip is one full day from 7 am to 7 pm.the field trip will include lunch, and will start, and end, at the lobby of Hotel Mision Juriquilla, Querétaro. 4. Sierra de Catorce: Remnants of the Ancient Western Equatorial Margin of Pangea in Central Mexico. José Rafael Barboza-Gudiño Universidad Autónoma de San Luis Potosí; Roberto S. Molina-Garza. Centro de Geociencias, UNAM; Timothy F. Lawton. New Mexico, Las Cruces. Sun. Tue., March. US$520. This field trip begins and ends in San Luis Potosí (~200 km north of Querétaro). Participants will explore turbiditic and wildflysh sequences of a triassic submarine fan system (Potosí Fan) or Upper Triassic Zacatecas Formation, and volcanic successions of the Lower Jurassic volcanic arc of western North America in north-central to northeastern Mexico ( Nazas Arc ). Both paleogeographic elements, outcropping in the Mesa Central province, are linked to the ancient western equatorial margin of Pangea during the early Mesozoic time. The trip will examine also the Middle to Upper Jurassic continental fining upward succession (La Joya Formation) and transgressive Upper Jurassic-Cretaceous cover exposed in the Sierra de Catorce uplift, including their stratigraphic and tectonic relations. Several stops will show sampling sites of new geochronologic data, which have implications for tectonic and paleogeographic reconstruction of central and northeastern Mexico. Field trip ends on March 27 in San Luis Potosí at 18, but participants have the option to stay in San Luis Potosí that night at own expense and travel on March 28 with the field trip leaders to Juriquilla with a stop at the spectacular La Joya Honda maar, arriving in time for the opening reception. No additional cost will be charged for this optional trip. 5. Late Pleistocene Rhyolitic Explosive Volcanism at Los Azufres Volcanic Field, Central Mexico. José Luis Arce, Instituto de Geología, UNAM, José Luis Macías Instituto de Geofísica, UNAM, geofisica.unam.mx). Sun. Tues., March. US$450. The Azufres Volcanic field, which lies in the Trans- Mexican Volcanic Belt, holds the second most important geothermal field in Mexico. This volcanic field is located within the remnants of a caldera structure. At depth, the Azufres volcanic field rests upon Miocene rocks (Sierra de Mil Cumbres), and Miocene-Pliocene volcanics (Sierra de Santa Inés). The oldest volcanic products of the volcanic field are 1.4 Ma old basalts, followed by a stratigraphic succession of andesites, dacites, and rhyolites forming domes, lava flows, stratovolcanoes, plateau lavas, and pyroclastic deposits with ages as young as 26 ka. In the fieldtrip we will examine the young rhyolitic pyroclastic sequences exposed in the southwestern sector of the Los Azufres volcanic field and discuss the relationship of this rhyolitic volcanism with the nearby volcanic structures (domes, stratovolcanoes). During the fieldtrip we will visit outcrops of pyroclastic deposits associated to Plinian and sub-plinian eruptions, and discuss the vent source, dynamics and magnitude of these eruptive events. In addition, we will observe the morphology of faults transecting the geothermal field and some kinematic indicators of fault movement. This field trip begins on March 25 in the morning at the International airport of Mexico City and ends at Hotel Misión Juriquilla, Querétaro (meeting headquarter) no later than 8 p.m. on March 27. Breakfast of the first day and lodging for the night of March 27 are not included in the fieldtrip fee. The nights of March 25 and 26 is spent in Ciudad Hidalgo. The driving distance from Mexico City to Ciudad Hidalgo, Michoacán is ~375 km (233 miles) (driving time ~4.5 hours), and from Ciudad Hidalgo to Juriquilla is 360 km (236 miles). 6. Ground Deformation Related to Anthropogenic Activities in Urbanized Areas of the Mexico Basin. Mariano Cerca and Dora Carreón, Centro de Geociencias, UNAM. Sun. Mon., 1 2 April. US$288. The modern Mexico megacity occupies almost all the surface of the Valley of Mexico and is exposed to natural and man-induced hazards affecting many aspects of urban development. In Mexico City, groundwater has been over-exploited for human consumption during the last fifty years, leading to a dramatic decline of piezometric levels and to the associated land and subsoil deformation. In this two-day fieldtrip we will examine regional land subsidence and the vulnerability to fracturing of the lacustrine soils of Mexico City. 7. Geology and Tectonics of the Southeastern Portion of the Sierra de Guanajuato. José Jorge Aranda-Gómez geociencias.unam.mx); Pablo Dávila-Harris; Luis Vassallo. Sun. Tue., March. Cost: US$380. Sierra de Guanajuato is located in central México in a region where several major geologic and tectonic provinces join. Rocks exposed in the Mesozoic basal complex are keys to understand the Guerrero terrane concept and the evolution of the southern part of the North America craton during the early Cretaceous. A Tertiary volcano-sedimentary succession, unconformably resting on top of the basal complex, includes one of the best documented continental red bed deposits in central México, which was accumulated immediately after the end of the Laramide orogeny and records the earliest pulses of extension in the region. Resting atop the red beds is a volcanic succession genetically related to the Oligocene activity of Sierra Madre Occidental volcanic province. World-class silver deposits that have been exploited for nearly four centuries are hosted in the Tertiary volcano-sedimentary succession, as well as in the rocks of the basal complex. The rocks of the basal complex and regional tectonic features are the focus of the first day of the field trip GSA Abstracts with Programs

9 and the last two days are devoted to the study of the nature and probable source of the volcanic rocks, which immediately preceded the ore deposition along two conspicuous sets of normal faults. 8. Recent Volcanism and Hazards at the Eastern Trans-Mexican Volcanic Belt. Gerardo Carrasco-Núñez Pablo Dávila-Harris, Nancy Riggs, Michael Ort, Brian Zimmer, Chris Willcox and Mike Branney. Sat. Mon., 31 March 2 Apr., US$270. In this field trip we will examine examples of recent (late Pleistocene and Holocene) volcanism in the eastern Trans-Mexican Volcanic Belt, where a diversity of volcanism and spectacular exposures can be seen. We will explore the complex pyroclastic succession and caldera-rim effusions of Los Humeros caldera volcano and geothermal field. We will also examine a very interesting vitrophyric rhyolite dome (Cerro Pizarro) and the structure and evolution of two contrasting maar volcanoes: Atexcac (a classic basaltic maar) and Cerro Pinto, a rhyolitic tuff ring-dome complex. 9. Geology and Geochronology of Tláloc, Telapón, and Iztaccíhuatl Volcanoes, Sierra Nevada, Central Mexico. José Luis Macías. Instituto de Geofísica, Unidad Morelia, UNAM, José Luis Arce, Instituto de Geología, UNAM; F. García, Instituto Politécnico Nacional, Paul W. Layer, University of Alaska at Fairbanks, G. Reyes- Agustín, Instituto Politécnico Nacional, F. López-Pizaña, Instituto Politécnico Nacional, H. Rueda, Posgrado de Ciencias de la Tierra, UNAM. Sun. Wed., 1 4 April. US$ 477. The field trip will focus on late Quaternary geology, morphology and geochronology of volcanoes of La Sierra Nevada volcanic range. This range includes, from south to north, the active Popocatépetl, Iztaccíhuatl, Telapón, and Tláloc volcanoes. The trip will highlight recent work, including mapping, stratigraphy, and geochronological data. The trip will include brief roadside stops, several short hikes to reach outcrops, and strenuous long hikes at altitudes over 4,000 m. Topics covered at fieldtrip stops are: 1) Evidence of late Pleistocene explosive activity at Tláloc volcano accompanied by effusive activity, 2) Effusive build-up of Telapón volcano and surrounding domes with episodes of dome destruction, 3) Major collapse of Los Pies cone at the southern edge of the Iztaccíhuatl volcanic complex and, 5) Popocatépetl s latest explosive episode which occurred in January 2001 and generated a 6-km long scoria flow deposit. This field trip begins at Hotel Misión, Juriquilla, Querétaro and ends at the Mexico City International airport. Participants on this field trip should eat breakfast (not included in the fieldtrip fee) before departing. The fieldtrip fee includes lunches for the four days, three breakfasts, and dinner for the third night. During the first day, the driving distance from Juriquilla, Querétaro to Tláloc volcano is about 280 km (~4 hours), and during the second day, the driving distance from Popocatépetl volcano to the Mexico City International airport is 75 km (~2 hours considering traffic). We plan to return to the Mexico City International airport around 6 pm GSA Cordilleran Section Meeting 35

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11 Schedule of Events Event Time Location Field Trips Sunday, 25 March Sierra de Catorce: Remnants of the ancient western equatorial margin of Pangea in central Mexico Late Pleistocene Rhyolitic Explosive Volcanism at Los Azufres Volcanic Field, Central Mexico Geology and Tectonics of the Southeastern Portion of the Sierra de Guanajuato Lobby of City Express Hotel in San Luis Potosí Fiesta Inn Hotel at Mexico City International Airport Hotel Misión Juriquilla Lobby Wednesday, 28 March Exhibit Set-up Juárez 1-2 Student volunteer training Mariposa 1 Speaker ready room Gobernador Registration open Corridor, in front of Juárez 1 Exhibit opening Juárez 1-2 Opening reception Parián (Plaza El Pueblito) Poster Session T16. Undergraduate Research * * Posters will remain displayed Wednesday and Thursday 17 18:30 Juárez 1-2 Field Trip Environmental Geochemistry of the Pozos Mining District, Guanajuato, East-Central Mexico 7 Hotel Misión Juriquilla Lobby Thursday 29 March Registration open 8 17 Corridor, in front of Juárez 1 Speaker Ready Room 8 17 Gobernador Exhibits open 8:30 18 Juárez 1-2 Roy J. Shlemon Mentor Program in Applied Geoscience 13 14:30 Siglo XVIII annexe Town Hall Meeting 17:30 18:30 Siglo XVIII Oral Sessions Morning S1. Amalgamation and Breakup of Pangea in the Americas 8:30 12:50 Juárez 3 T8. Lithosphere Stretching and Magmatism Leading to the Gulf of California 8:30 12:55 Siglo XVIII T17. Environmetal Geochemistry 8:30 12:55 Goyesco GSA Cordilleran Section Meeting 37

12 Event Time Location Afternoon S1. Amalgamation and Breakup of Pangea in the Americas II 14:30 16:30 Juárez 3 T9. What Fossil Ages and Distributions Tell Us about the History of the Ancient Gulf of California? 14:30 16:50 Siglo XVIII T17. Environmental Geochemistry II, Keynote 14:30 15:00 Goyesco 1 T13. Heterogeneous Geologic Formations: Modeling Spatial Variability 15:00 16:30 Goyesco 1 Poster Sessions ** S1. Amalgamation and Breakup of Pangea in the Americas 8:30 18:30 Juárez 1-2 T8. Lithosphere Stretching and Magmatism Leading to the Gulf of California T9. What Fossil Ages and Distributions Tell Us about the History of the Ancient Gulf of California? T11. Developments in Geophysical Investigations of Volcano Hydrothermal Systems: Exploration and Hazards 8:30 18:30 Juárez 1-2 8:30 18:30 Juárez 1-2 8:30 18:30 Juárez 1-2 T16. Undergraduate Research 8:30 18:30 Juárez 1-2 T17. Environmetal Geochemistry 8:30 18:30 Juárez 1-2 Geophysics/Seismology 8:30 18:30 Juárez 1-2 Stratigraphy and Sedimentology 8:30 18:30 Juárez 1-2 Palaentology 8:30 18:30 Juárez 1-2 Volcanology 8:30 18:30 Juárez 1-2 ** Authors are present at their posters from 16:30 to 18:30. Friday, 30 March Registration open 8 17 Corridor, in front of Juárez 1 Speaker Ready Room 8 17 Gobernador Exhibits open 8:30 18 Juárez 1-2 John Mann Mentors in Applied Hydrogeology Program :30 Siglo XVIII annexe Oral Sessions Morning T1. Silicic Volcanism I 8:30 12:50 Juárez 3 T3. Convergent Margin of Western Pangea: Triassic-Jurassic Magmatism, Sedimentation, and Tectonics from Colombia to Oregon T10. The Caribbean Plate and its Geologic Connections with North and South America T12. Limnogeology Studies and Paleoenvironmental Records from Ancient and Modern Lakes 8:30 12:50 Goyesco 1 8:30 12:50 Siglo XVIII 8:30 12:50 Mariposa GSA Abstracts with Programs

13 Event Time Location Afternoon T1. Silicic Volcanism II 14:30 16:30 Juárez 3 T14. Ground Deformation Related to Anthropogenic Activities: Achievements in the Development of Geoscience Information System for Improved Management of Natural Resources 14:30 16:50 Goyesco 1 Structural Geology/Tectonics 14:30 16:50 Siglo XVIII Poster Sessions ** T1. Silicic Volcanism 8:30 18:30 Juárez 1-2 T2. Ore Deposits and Ore Genesis in the American Cordillera 8:30 18:30 Juárez 1-2 T3. Convergent Margin of Western Pangea: Triassic-Jurassic Magmatism, Sedimentation, and Tectonics from Colombia to Oregon 8:30 18:30 Juárez 1-2 T5. Mechanisms of Arc Magma Generation along the Cordillera 8:30 18:30 Juárez 1-2 T6. Terrane Accretion, Flat Slab Subduction, and Convergence Rate Variations: What Caused the Cretaceous-Paleogene Shortening across the Mexican Cordillera? T10. The Caribbean Plate and its Geologic Connections with North and South America T12. Limnogeology Studies and Paleoenvironmental Records from Ancient and Modern Lakes 8:30 18:30 Juárez 1-2 8:30 18:30 Juárez 1-2 8:30 18:30 Juárez 1-2 Structural Geology/Tectonics 8:30 18:30 Juárez 1-2 Geochemistry and Petrology of igneous rocks 8:30 18:30 Juárez 1-2 ** Authors are present at their posters from 16:30 to 18:30. Keynote Address Joaquín Ruiz, Department of Gesciences, University of Arizona, Past President of GSA, Isotopic Studies of Hydrocarbon Systems Centro Académico Cultural (CAC), UNAM Campus saturday, 31 March Registration open 8 noon Corridor, in front of Juárez 1 Speaker Ready Room 8 13 Gobernador Exhibits open 8 13 Juárez 1-2 Exhibits take down Juárez 1-2 Oral Sessions Morning T2. Ore Deposits and Ore Genesis in the American Cordillera 8 12:50 Goyesco 1 T5. Mechanisms of Arc Magma Generation along the Cordillera 8 12:50 Juárez 3 T6. Terrane Accretion, Flat Slab Subduction, and Convergence Rate Variations: What Caused the Cretaceous-Paleogene Shortening across the Mexican Cordillera? 8 12:50 Siglo XVIII 2012 GSA Cordilleran Section Meeting 39

14 Event Time Location Field Trips Late Paleozoic Early Mesozoic of the Acatlán and Ayu Complexes, Southern Mexico: Events on the Periphery of Pangea Synchronous with Amalgamation and Breakup Recent Volcanism and Hazards at the Eastern Trans-Mexican Volcanic Belt 13:00 Hotel Misión Juriquilla Lobby 16:00 Hotel Misión Juriquilla Lobby Sunday, 1 April Field Trips Ground Deformation Related to Anthropogenic Activities in Urbanized areas of the Mexico Basin The Late Cretaceous Mexican Fold-and-Thrust Belt and its Possible Relation with the Accretion of the Guerrero Terrane Geology and Geochronology of Tlaloc, Telapon and Iztaccíhuatl Volcanoes, Sierra Nevada, Central Mexico 8 Hotel Misión Juriquilla Lobby 7:30 Hotel Misión Juriquilla Lobby 9 Hotel Misión Juriquilla Lobby Geosphere is the place to publish! Geosphere offers: rigorous peer review a flexible format free color rapid publication after acceptance a broad, international audience Submit your manuscript online at For submission details, visit Submissions welcomed from all geoscience disciplines GSA Abstracts with Programs

15 Technical Sessions Meeting policy prohibits the use of cameras or sound-recording equipment at technical sessions and poster sessions. A no-smoking policy has been established by the Programme Committee and will be followed in all meeting rooms for technical sessions. Notice In the interest of public information, The Geological Society of America provides a forum for the presentation of diverse opinions and positions. The opinions (views) expressed by speakers and exhibitors at these sessions are their own and do not necessarily represent the views or policies of The Geological Society of America. Note index system Numbers (3-4, 15-4) indicate session and order of presentation within that session. * denotes speaker WEDNESDAY, 28 MARCH 2012 SESSION NO. 1 evening Poster Technical Sessions T16. Undergraduate Research (Posters) (Council on Undergraduate Research (CUR)) 17:00, Hotel Misión Juriquilla, Juarez 1 and 2 Authors will be present from 17:00 to 18:30 Weds. and 16:30-18:30 Thurs Pérez- Crespo, Víctor Adrián*; Arroyo-Cabrales, Joaquín; Alva-Valdivia, Luis M.; Morales-Puente, Pedro; Cienfuegos-Alvarado, Edith; Otero, Francisco J.: INFERENCES FOR LATE PLEISTOCENE HORSES GENUS EQUUS SP. AT LATE PLEISTOCENE FROM SEVEN MEXICAN LOCALITIES Cooley, Sarah W.*; Domonoske, Alison F.; Moore, Erin N.; Shukla, Sagar S.: DEGRADATION OF MORAINE SLOPES WITH AGE IN QUATERNARY MORAINES OF EASTERN CALIFORNIA Morgan, Camille*; Jin, Annie; Medlin, Rachel; Kress, Tyler: BOULDER HARDNESS AS AN INDICATION OF RELATIVE AGE OF MORAINES IN EASTERN CALIFORNIA Sickmann, Zachary*; Surpless, Kathleen DeGraaff; Konetchy, Brant: PROVENANCE ANALYSIS OF THE WINTHROP FORMATION OF THE METHOW BASIN, NORTHERN WASHINGTON: EVIDENCE FOR MINOR POST-DEPOSITIONAL DISPLACEMENT Konetchy, Brant*; Surpless, Kathleen DeGraaff; Sickmann, Zachary: EVIDENCE FOR MINOR POST-DEPOSITIONAL DISPLACEMENT OF THE METHOW BASIN, NORTHERN WASHINGTON: DETAILED PROVENANCE ANALYSIS OF THE HARTS PASS FORMATION Dustin, Kelly Nicole*; Miller, Robert B.; Shea, Erin: INTRUSIVE RELATIONSHIPS AND DEFORMATION OF MAFIC AND TONALITIC ROCKS IN PART OF THE SEVEN FINGERED JACK PLUTON, NORTH CASCADES, WASHINGTON Grasso, Kyla A.*; Meigs, Andrew; Cladouhos, Trenton T.: ORIGIN OF FAULTS, FISSURES AND VOLCANIC VENT ALIGNMENTS AT A STRUCTURAL TRIPLE JUNCTION, NEWBERRY VOLCANO, CENTRAL OREGON Ferreira, Gabriela R.*; Dinklage, William S.: RHYOLITE VOLCANISM IN THE TRANS-MEXICAN VOLCANIC BELT WITH IMPLICATIONS FOR GROUNDWATER FLOW IN THE VILLAGE OF GARBANZO Sabbeth, Leah*; Stock, Joann M.: UPDATED ISOPACH MAP OF THE TUFF OF SAN FELIPE IN BAJA CALIFORNIA, Olivares-Escobar, Asael*; García Dobarganes-Bueno, Juan Esteban; Levresse, Gilles; Aranda-Rodríguez, Armando: FLUID INCLUSIONS ANALYSIS AT CHARCAS MINE, CHARCAS MINING DISTRICT, THURSDAY, 29 MARCH 2012 morning Oral Technical Sessions SESSION NO. 2 S1. Amalgamation and Breakup of Pangea in the Americas I (IGCP 597 (Origin and Evolution of Pangea) and IGCP 574 (Bending and Bent Orogens, Continental Ribbons)) 08:30, Hotel Misión Juriquilla, Juarez 3 J. Brendan Murphy, Jarda Dostal, and R. Damian Nance, Presiding :30 Murphy, J. Brendan*; Dostal, Jaroslav; Nance, R. Damian: J. DUNCAN KEPPIE: AN APPRECIATION AND A CELEBRATION :50 Ramos, Víctor A.*: PALEOZOIC TERRANES IN THE BASEMENT OF THE ANDES :30 Nance, R. Damian*; Murphy, J. Brendan; Pisarevsky, Sergei A.: POTENTIAL GEODYNAMIC RELATIONSHIPS BETWEEN THE DEVELOPMENT OF PERIPHERAL OROGENS ALONG THE NORTHERN MARGIN OF GONDWANA AND THE AMALGAMATION OF WEST GONDWANA 2012 GSA Cordilleran Section Meeting 41

16 SESSION NO :50 Braid, James A.; Quesada, Cecilio*; Murphy, J. Brendan; Mortensen, James K.: PRESENCE OF EXOTIC LAURUSSIAN CRUSTAL BLOCKS WITHIN, AND SOUTH OF, THE RHEIC SUTURE ZONE IN SW IBERIA :10 Gladney, Evan R.*: THE GIL MARQUEZ PLUTON, SOUTHERN IBERIA: MAGMATISM DURING CONTINENTAL COLLISION AND THE AMALGAMATION OF PANGEA 10:30 Break :50 Dahn, Dustin R.L.*; Braid, James A.; Murphy, J. Brendan: TECTONIC SIGNIFICANCE OF A MAFIC MÉLANGE IN THE PANGEAN SUTURE ZONE, SW IBERIA :10 Solari, Luigi*; Ortega-Gutiérrez, Fernando; Elias Herrera, Mariano; Ortega-Obregón, Carlos; Macías Romo, Consuelo; Reyes Salas, Margarita: DETRITAL PROVENANCE OF THE GRENVILLIAN OAXACAN COMPLEX, SOUTHERN : A ZIRCON PERSPECTIVE :30 Galaz-Escanilla, Gonzalo*; Keppie, J. Duncan; Murphy, J. Brendan; Lee, James K.W.; Ortega-Rivera, Amabel: HIGH PRESSURE KLIPPE ON THE ACTIVE WESTERN MARGEN OF PANGEA DURING INITIAL STAGES OF ITS AMALGAMATION :50 Ramos-Arias, Mario*; Ortega-Obregón, Carlos; Keppie, J. Duncan: GEOCHEMICAL, GEOCHRONOLOGICAL AND STRUCTURAL CONNECTIONS BETWEEN THE WESTERN AND CENTRAL HIGH PRESSURE BELTS IN ACATLÁN COMPLEX, SOUTHERN MÉXICO: ONE CYCLE OF METAMORPHIC PETROGENESIS AND EMPLACEMENT DURING LATE DEVONIAN-MISSISSIPPIAN SUBDUCTION- EXTRUSION ON THE WESTERN MARGIN OF PANGEA :10 Morales-Gámez, Miguel*; Keppie, J. Duncan; Dostal, Jaroslav; Lee, James K.W.; Ortega-Rivera, Amabel: PERMO- CARBONIFEROUS DEFORMATIONAL EVENTS IN THE XAYACATLÁN TYPE AREA, SOUTHERN ASSOCIATED WITH MISSISSIPPIAN EXTRUSION AND MIDDLE PERMIAN TRANSTENSIONAL ARC DEVELOPMENT ON THE WESTERN MARGIN OF PANGEA :30 Kirsch, Moritz*; Keppie, J. Duncan; Murphy, J. Brendan; Lee, James K.W.: EMPLACEMENT OF THE LATE CARBONIFEROUS PERMIAN ARC-RELATED TOTOLTEPEC PLUTON, ACATLÁN COMPLEX, SOUTHERN : SYNTECTONIC INTRUSION ALONG A MID-CRUSTAL TRANSPRESSIONAL SHEAR ZONE SESSION NO. 3 T8. Lithosphere Stretching and Magmatism Leading to the Gulf of California 08:30, Hotel Misión Juriquilla, Siglo XVIII Luca Ferrari, Arturo Martin-Barajas, and Joann Stock, Presiding 08:30 Introductory Remarks :35 Fletcher, John*: KEYNOTE: THE OPENING OF THE GULF OF CALIFORNIA: TEMPORAL VS SPATIAL VARIATIONS IN RIFT KINEMATICS :05 Martín, Arturo*; González-Escobar, Mario; Fletcher M, John; Pacheco, Martín: CONTINENTAL RUPTURE DELAYED BY SEDIMENTATION AND LOW-ANGLE NORMAL FAULTS IN THE NORTHERN GULF OF CALIFORNIA: ANALYSIS OF SEISMIC REFLECTION PROFILES IN THE TIBURON AND DELFIN BASINS :25 Darin, Michael H.*; Dorsey, Rebecca J.; Bennett, Scott E.K.; Oskin, Michael E.; Iriondo, Alex: LATE MIOCENE EXTENSION IN THE SIERRA BACHA, COASTAL SONORA, : IMPLICATIONS FOR THE KINEMATIC EVOLUTION OF THE PROTO-GULF OF CALIFORNIA :45 Bennett, Scott E.K.*; Oskin, Michael E.; Iriondo, Alex: PROGRESSIVE LOCALIZATION OF DEXTRAL SHEAR IN THE LATE PROTO-GULF OF CALIFORNIA :05 Olguin Villa, Angel Enrique*; Stock, Joann M.; Vidal Solano, Jesus R.: MAGNETIC STRATIGRAPHY OF PERALKALINE VOLCANISM IN SIERRA LIBRE, SONORA, 10:25 Break :45 Lonsdale, Peter*: KEYNOTE: THE HISTORY AND CAUSES OF THE RIFTING, SHEARING AND SPREADING THAT OPENED THE MOUTH OF THE GULF OF CALIFORNIA :15 Ferrari, Luca*; Orozco-Esquivel, Teresa; López Martínez, Margarita; Duque, Jose; Bryan, Scott; Cerca, Mariano: 25 MILLION YEARS TO BREAK A CONTINENT: EARLY TO MIDDLE MIOCENE RIFTING AND SYN-EXTENSIONAL MAGMATISM IN THE SOUTHERN GULF OF CALIFORNIA :35 Bennett, Scott E.K.*; Oskin, Michael E.; Dorsey, Rebecca J.; Darin, Michael H.: RECONSTRUCTING THE NORTHERN GULF OF CALIFORNIA-SALTON TROUGH OBLIQUE RIFT :55 Mark, Chris*; Gupta, Sanjeev; Carter, Andrew; Mark, Darren F.; Gautheron, Cécile; Martin-Barajas, Arturo: TEMPORAL CONSTRAINTS ON THE LANDSCAPE RESPONSE TO RIFTING IN THE LORETO REGION OF BAJA CALIFORNIA SUR, :15 Portillo-Pineda, Rodrigo*; Cerca, Mariano; Ferrari, Luca; Corti, Giacomo: ANALOGUE MODELS OF THE SOUTHERN PART OF THE GULF OF CALIFORNIA RIFT :35 Bryan, Scott*; Ferrari, Luca; Orozco-Esquivel, Teresa; López-Martínez, Margarita: PULLING APART THE MID TO LATE CENOZOIC MAGMATIC RECORD OF THE GULF OF CALIFORNIA: NO ROOM FOR THE COMONDÚ ARC SESSION NO. 4 T17. Environmental Geochemistry I 08:30, Hotel Misión Juriquilla, Goyesco 1 Mario Villalobos, Laura E. Beramendi-Orosco, Francisco Romero, Priyadarsi Roy, and Ofelia Morton, Presiding :30 Kirby, Matthew E.*; Feakins, Sarah J.; Fantozzi, Joanna; Lund, Steve P.; Hiner, Christine: KEYNOTE: MAKING SENSE OF THE LAST DEGLACIATION BETWEEN CLIMATOLOGICALLY DIVERSE REGIONS: A VIEW FROM LAKE ELSINORE IN THE COASTAL SOUTHWEST UNITED STATES TO THE INTERIOR SOUTHWEST UNITED STATES AND NORTHERN :00 Roy, Priyadarsi*; Quiroz, Jesús David; Chavez-Lara, Claudia; Lozano, Socorro; Perez, Ligia; Lozano, Rufino; Romero, Francisco: LATE PLEISTOCENE-HOLOCENE PALEO- PRECIPITATION RECORDS FROM THE DRYLANDS OF NORTHERN :20 Solleiro-Rebolledo, Elizabeth*; Sedov, Sergey; Cabadas, Héctor; Landa, Federico: GEOCHEMESTRY OF CALICHES OF NORTHEAST YUCATAN AS EVIDENCES OF SOIL DEVELOPMENT IN KARSTIC GEOSYSTEMS :40 Gutierrez, Melida*: SPATIAL VARIABILITY OF FE, MN, AND BA OF SEDIMENTS WITHIN THE CHIHUAHUAN DESERT, :00 Del Rio Salas, R.*; Meza-Figueroa, D.; Ruiz, J.; De la O-Villanueva, M.; Moreno-Rodríguez, V.; Valencia Moreno, M.; Gómez-Alvarez, A.; Grijalva, T.; Campillo, A.; Paz-Moreno, F.: TRACING OF POLLUTION SOURCES IN URBAN DUST AND SOILS FROM HERMOSILLO CITY (NORTHWESTERN ) USING PB ISOTOPES :20 Baumann, Francine*: ENVIRONMENTAL EXPOSURE TO CARCINOGENIC FIBERS DUE TO SERPENTINITE PAVED ROADS IN NEW CALEDONIA: LESSONS IN ENVIRONMENTAL EPIDEMIOLOGY AND IN PREVENTION 10:40 Break :50 Martínez-Villegas, Nadia*; Castañón-Sandoval, Alan; Ramos-Leal, José Alfredo; Briones-Gallardo, Roberto; Avalos-Borja, Miguel; Razo-Flores, Elías; Villalobos, Mario: ARSENIC MOBILITY CONTROL BY SOLID CALCIUM GSA Abstracts with Programs

17 SESSION NO. 7 ARSENATES: AN ALTERNATIVE MECHANISM OF RETENTION OF ARSENIC IN THE ENVIRONMENT :10 Hansen, Anne M.*; Mahé, Florence; Corzo-Juárez, Carlos: ASSESSING METALS RELEASE FROM SEDIMENTS IN LAKES AND RESERVOIRS :30 Villalobos, Mario*; Salazar-Camacho, Carlos; Antelo, Juan: THE IMPORTANCE OF THE MINERAL/WATER INTERFACE FOR CONTROLLING THE MOBILITY OF IONS: MACRO- AND MICROSCOPIC INVESTIGATIONS UNIFYING THE ADSORPTION BEHAVIOR OF THE FE OXYHYDROXIDES GOETHITE AND FERRIHYDRITE :50 Aguilar-Carrillo, Javier*; Clarke, Cathy E.; Roychoudhury, Alakendra N.: DRYING INDUCED ACIDITY AT THE MINERAL- WATER INTERFACE: ATR-FTIR SPECTROSCOPY :10 Aguirre-Gómez, Arturo; Guzmán-Rangel, Georgina*: EFFECT OF CHEMICAL-AGRONOMIC TREATMENTS ON THE EXTRACTABLE AND FREE CD, CU, PB AND ZN LEVELS SUITABLE FOR REMEDIATING MINE TAILINGS AND POLLUTED SOILS :30 Beramendi-Orosco, Laura E.*; Gonzalez-Hernandez, Galia: RADIOCARBON CONCENTRATION IN SHORT-LIVED HERBACEOUS PLANTS AS INDICATOR OF FOSSIL CO 2 EMISSIONS IN URBAN REGIONS 12:50 Concluding Remarks Poster Technical Sessions SESSION NO. 5 Geophysics/Seismology (Posters) Wamalwa, Antony Munika*; Mickus, Kevin; Serpa, Laura; Doser, Diane: ANALYSIS OF GRAVITY AND MAGNETOTELLURIC DATA FROM THE COSO GEOTHERMAL FIELD, SOUTHEAST CALIFORNIA Hussein, Musa; Mickus, Kevin*; Serpa, Laura: CURIE DEPTH ANALYSIS OF DEATH VALLEY AND SURROUNDING REGION, CALIFORNIA León Loya, Rodrigo Alejandro*; Gómez González, Juan Martín: INTRAPLATE MICRO-SEISMICITY IN THE CENTRAL PART OF THE SIERRA MADRE ORIENTAL, SESSION NO. 6 Paleontology (Posters) Beraldi-Campesi, Hugo*: 3D RECONSTRUCTION OF MELOSIRA HUEPACENSIS, A FRESHWATER CRETACEOUS DIATOM Riquelme, Francisco*; Stojanoff, Vivian; Tappero, Ryan; Bennett, Steve; Acerbo, Alvin; Northrup, Paul; Siddons, Peter; Moreno, Abel; Ruvalcaba-Sil, José Luis; Alvarado-Ortega, Jesús: SYNCHROTRON- BASED TECHNIQUES: THE MOLECULAR TAPHONOMY OF INSECTS TRAPPED IN AMBER FROM THE EARLY MIOCENE CHIAPAS LAGERSTÄTTE Jimenez-Hidalgo, Eduardo*; Campos-Camacho, Mario Alberto; Guerrero-Arenas, Rosalía; Cabrera-Perez, Lucia: THE LATE PLEISTOCENE EQUIDS FROM NORTHWESTERN OAXACA, SOUTHERN Guerrero-Arenas, Rosalía*; Jimenez-Hidalgo, Eduardo; García-Barrera, Pedro: A PRELIMINARY INTERPRETATION OF THE TAPHONOMY AND PALEOENVIRONMENTAL CONDITIONS OF A LATE PLEISTOCENE NON-MARINE INVERTEBRATE AND MICROVERTEBRATE ASSEMBLAGE IN OAXACA, SOUTHERN Omaña, Lourdes*; Buitron, Blanca E.; Pantoja-Alor, Jerjes: A FORAMINIFERA AND GASTROPOD ASSEMBLAGE FROM THE MAL PASO FORMATION IN THE CHUMBÍTARO REGION, GUERRERO, SOUTH : BIOSTRATIGRAPHICAL, PALEOECOLOGICAL AND PALEOBIOGEOGRAPHICAL SIGNIFICANCE Ramírez-Garza, Blanca Margarita*; González-Arreola, Celestina: BARREMIAN AMMONITE BIOSTRATIGRAPHY FROM THE SAN LUCAS FORMATION IN THE HUETAMO REGION, MICHOACÁN, Buitron, Blanca E.*: GASTROPODS, BIOSTRATIGRAPHY, AND PALEOGEOGRAPHY, LOWER CRETACEOUS, IN A RUDIST- BEARING FORMATION, JALISCO, Oviedo, Angelica*; Dávila, Elizabeth; Chacón, Enrique; Franco-Rubio, Miguel; Estrada, Jesus; Ortiz, Guillermo; Velasco, Gladys; Torres, Aidee; Zavala, Loreto: PALEONTOLOGY COLLECTION AT THE RAYENARI MUSEUM AROUND LAGUNA DE BUSTILLOS, CHIHUAHUA, Guerrero-Arenas, Rosalía*; Gonzalez-Rodriguez, Katia Adriana: STRATEGIES FOR TEACHING GEOLOGICAL AND PALEONTOLOGICAL PROCESSES AND EVENTS OCCURRED IN EARTH HISTORY SESSION NO. 7 Stratigraphy/Sedimentology (Posters) Morgan, George J.*; Morgan, J.R.: GARNET WASH FORMATION AND THE IMPERIAL GROUP: A NEW LOOK AT OLD PROBLEMS, COYOTE MOUNTAINS, WESTERN SALTON TROUGH, IMPERIAL COUNTY, SOUTHERN CALIFORNIA, USA Amaya-Martínez, Ricardo*; Premo, Wayne R.; Poole, Forrest G.: DEPOSITIONAL SETTING AND SOURCE OF DETRITAL ZIRCONS IN THE PERMIAN MINA MÉXICO FOREDEEP IN SONORA, Lindner, Philip*; Riggs, Nancy; González-León, Carlos M.: PROVENANCE STUDY OF LATEST PALEOZOIC TO MESOZOIC EL ANTIMONIO GROUP, SONORA,, AND IMPLICATIONS FOR TECTONIC EVOLUTION OF SOUTHWEST LAURENTIA Franco-Rubio, Miguel*; Oviedo, Angelica: STRATIGRAPHY OF THE CUCHILLO FORMATION IN CHIHUAHUA, MÉXICO Escalona-Alcázar, Felipe de Jesús*; García-Sandoval, Perla; Escobedo-Arellano, Bianney; Carrillo-Castillo, Carlos; Castillo-Félix, Brenda; Solari, Luigi; Núñez-Peña, Ernesto Patricio; García y Barragán, Juan Carlos; Bluhm-Gutiérrez, Jorge; Esparza-Martínez, Alicia: LITHOLOGIC AND STRUCTURAL CHARACTERISTICS OF THE PALEOCENE-EOCENE ZACATECAS CONGLOMERATE, CENTRAL Escobar, Elia*; Urrutia-Fucugauchi, Jaime: THE CARBONATE PALEOGENE SEQUENCE OF THE CHICXULUB IMPACT BASIN, YUCATAN PLATFORM YAXCOPOIL-1 BOREHOLE Stockton, David R.*: GLACIATION IN THE WHITE MOUNTAINS, COTTONWOOD PLATEAU ICE FIELD, INYO COUNTY, EASTERN CALIFORNIA Maloof, David*; Lopez, Roberto; Martinez, Fernando; Torres, Ricardo; Franco, Miguel: LITHOLOGICAL AND STRATIGRAPHICAL DATA WAREHOUSE INFORMATION SYSTEM 2012 GSA Cordilleran Section Meeting 43

18 SESSION NO. 8 SESSION NO. 8 Volcanology (Posters) Ort, Michael H.*; Unema, Joel A.; Larsen, Jessica F.; Schaefer, Janet R.: COMPLEX WATER-MAGMA INTERACTION DURING THE 2008 ERUPTION AT OKMOK VOLCANO, ALASKA Rodriguez-Sedano, L.A.*; Sarocchi, Damiano; Bartali, Roberto; Montenegro, Anibal: LAHAR DEPOSITS ON LA LUMBRE RAVINE RELATED TO THE GREAT 1913 PLINIAN ERUPTION OF VOLCAN DE COLIMA Caballero, Lizeth*; Sarocchi, Damiano; Borselli, Lorenzo: QUANTITATIVE CLAST SHAPE ANALYSIS APPLIED TO INTERNAL DYNAMICS OF DEBRIS FLOWS Zimmer, Brian*; Liutkus, Cynthia; Carmichael, Sarah; Richmond, Brian; Hewitt, Seth; Hatala, Kevin; Harcourt-Smith, William E.H.; Gordon, Adam; Mana, Sara; Brett, Jim: A SNAPSHOT IN TIME: DETERMINING THE AGE, ENVIRONMENT, AND SOCIAL STRUCTURES OF EARLY HOMO SAPIENS USING TRACE FOSSILS IN VOLCANICLASTIC ROCKS AT THE ENGARE SERO FOOTPRINT SITE, LAKE NATRON, TANZANIA Aguirre-Díaz, Gerardo J.*; Tristán-González, Margarito; Labarthe-Hernández, Guillermo; Aguillón-Robles, Alfredo; Nieto-Obregón, Jorge; López-Martínez, Margarita; Bellon, Hervé: THE PEÑA DE BERNAL NATURAL MONUMENT OF QUERETARO, SESSION NO. 9 S1. Amalgamation and Breakup of Pangea in the Americas (Posters) (IGCP 597 (Origin and Evolution of Pangea) and IGCP 574 (Bending and Bent Orogens, Continental Ribbons)) Estrada-Carmona, Juliana*; Weber, Bodo; Martens, Uwe K.; López-Martínez, Margarita: PETROGENESIS OF ORDOVICIAN MAGMATIC ROCKS IN THE SOUTHERN CHIAPAS MASSIF AND RELATIONS WITH THE EARLY PALEOZOIC MAGMATIC BELTS OF NORTHWESTERN GONDWANA SESSION NO. 10 T8. Lithosphere Stretching and Magmatism Leading to the Gulf of California (Posters) Skinner, Lisa A.*; Umhoefer, Paul J.; Kluesner, Jared W.; Nava, Richard: GIS PLATE TECTONIC RECONSTRUCTION OF THE SOUTHERN GULF OF CALIFORNIA OBLIQUE RIFT Skinner, Steven*; Stock, Joann; Martin-Barajas, Arturo: CHARACTERIZATION OF THE TUFF OF SAN FELIPE ON ISLA ANGEL DE LA GUARDA, BAJA CALIFORNIA, Figueroa-Albornoz, Leonardo*; Mortera-Gutierrez, Carlos A.; Escobar-Briones, Elva; Godfroy, Anne; Bandy, William L.; Ponce-Núñez, Francisco; Taran, Yuri A.; Bernard-Romero, Ruben A.: COLD SEEPS IN THE SONORA MARGIN BASIN AT GUAYMAS BASIN, GULF OF CALIFORNIA, Duque, Jose*; Ferrari, Luca; Orozco-Esquivel, Teresa; López Martínez, Margarita; Lonsdale, Peter: RAPID EXHUMATION OF EARLY TO MIDDLE MIOCENE INTRUSIVE ROCKS IN THE SOUTHERN GULF OF CALIFORNIA: THE EARLY STAGES OF CONTINENTAL BREAKUP SESSION NO. 11 T9. What Fossil Ages and Distributions Tell Us about the History of the Ancient Gulf of California (Posters) Leyva Valencia, Ignacio*; Cruz Hernández, Pedro; Lluch Cota, Daniel Bernardo; Rojas Posadas, Delia Irene; Rugh, N. Scott; Correa Ramírez, Miguel Mauricio: PHYLOGENETIC RELATIONSHIPS OF GEODUCK CLAMS PANOPEA GENEROSA AND P. GLOBOSA AND THEIR ANCIENT AND EXTANT DISTRIBUTION IN BAJA CALIFORNIA AND THE GULF OF CALIFORNIA Ramírez-Arriaga, Elia*; Prámparo, Mercedes B.; Guerstein, G. Raquel; Martínez-Hernández, Enrique; Galván-Escobedo, Iris G.; Corona-Esquivel, Rodolfo; Marmolejo-Rodríguez, A.J.: MARINE AND CONTINENTAL ASSEMBLAGES FROM SAN GREGORIO FORMATION (LATE OLIGOCENE EARLY MIOCENE), LA BOCANA REGION, BAJA CALIFORNIA SUR, SESSION NO. 12 T11. Developments in Geophysical Investigations of Volcano Hydrothermal Systems: Exploration and Hazards (Posters) Martínez Reyes, José*; Vera Romero, Ivan; Estrada Jaramillo, Meliton; Nuñez Gonzalez, José; Lopez Andrade, Xicotencatl; Roldan Ahumada, Ma. Claudia; Peña, Rafael: GEOTHERMAL PROSPECTION OF THE CIÉNEGA OF CHAPALA, MICHOACAN, MÉXICO Bouligand, Claire*; Glen, Jonathan; McPhee, Darcy K.: ESTIMATING THE GEOMETRY AND EXTENT OF ALTERATION IN HYDROTHERMAL AREAS OF YELLOWSTONE NATIONAL PARK BASED ON HIGH-RESOLUTION MAGNETIC SURVEYS Hurwitz, Shaul*; Vandemeulebrouck, Jean; Sohn, Robert A.; Rudolph, Maxwell L.; Johnston, Malcolm J.S.; Karlstrom, Leif: GEODETIC, SEISMIC AND ACOUSTIC MEASUREMENTS OF ERUPTIONS AT LONE STAR GEYSER, YELLOWSTONE NATIONAL PARK, USA SESSION NO. 13 T17. Environmental Geochemistry (Posters) Gutierrez, Melida; Mickus, Kevin; Johnson, Elias*: UTILITY OF GEOEYE IN ASSESSING RIPARIAN VEGETATION ALONG THE RIO CONCHOS, Charles-Polo, Marcela*; Roy, Priyadarsi; Sanchez, Jóse Luis; Lozano, Rufino; Pi-Puig, Teresa; Romero, Francisco: A LATE QUATERNARY GEOCHEMICAL RECORD FROM THE PALEOAKE LA SALADA, SOUTHERN CHIHUAHUA DESERT, MÉXICO Santhiya, G.; Lakshumanan, C.; Jonathan, M.P*; Roy, P.D: EVALUATION OF COASTAL BEACH SEDIMENTS IN CHENNAI COAST, SE COAST OF INDIA Tovar, Rosa E.*; Sedov, Sergey: STABLE CARBON ISOTOPE SIGNATURES FROM PALEOSOL HUMUS FOR RECONSTRUCTING LATE PLEISTOCENE ENVIRONMENTS OF AXAMILPA, PUEBLA Cruz-Ortiz, Norma L.*; Audifred-Valdes, Alicia I.; Carrillo-Chávez, Alejandro: HEAVY METALS DISTRIBUTION IN THE MACONI MINING ZONE, QUERETARO Morton-Bermea, Ofelia*; Hernández-Álvarez, Elizabeth; Amador-Muñoz, Omar; Villalobos-Pietrini, Rafael; Murillo-Tovar, Mario Alfonso; Hernández-Mena, Leonel; García-Arriola, GSA Abstracts with Programs

19 SESSION NO. 17 Maria Elena: HEAVY METAL CONCENTRATION OF PM2.5 IN THE ATMOSPHERIC ENVIRONMENT OF METROPOLITAN ZONE OF CITY Miranda-Aviles, Raul*; Puy-Alquiza, Maria Jesus; Pérez-Arvizu, Ofelia; Casillas-Jimenez, Gabriela: ANTHROPOGENIC METAL CONTENT AND SEDIMENTOLOGY OF OVERBANK SEDIMENTS FROM THE MINING DISTRICT OF GUANAJUATO, Salas-Megchun, Erik F.*; Ayala-De la Portilla, Elihu H.; Gerke, Tammie L.; Carrillo-Chávez, Alejandro; Levresse, Gilles: PRELIMINARY ENVIRONMENTAL GEOCHEMICAL EVALUATION OF THE MINE WASTE MATERIAL AT THE XICHU MINING DISTRICT, SIERRA GORDA NATURAL RESERVE, NORTHEAST GUANAJUATO STATE Pérez, Isabel*; Romero, Francisco: MAGNETIC SUSCEPTIBILITY AND ELECTRIC CONDUCTIVITY AS A PROXY OF SOIL HEAVY METAL POLUTION FROM MINING AND METALLURGICAL AREAS Israde-Alcántara, Isabel*; Verduzco Cedeño, Luis Alberto; Carrillo-Chávez, Alejandro: GEOLOGICAL CHARACTERIZATION AND ENVIRONMENTAL IMPLICATIONS OF THE MORELIA DUMP, 10 YEARS LATER afternoon Oral Technical Sessions SESSION NO. 14 S1. Amalgamation and Breakup of Pangea in the Americas II (IGCP 597 (Origin and Evolution of Pangea) and IGCP 574 (Bending and Bent Orogens, Continental Ribbons)) 14:30, Hotel Misión Juriquilla, Juarez 3 J. Brendan Murphy, Jarda Dostal, and R. Damian Nance, Presiding :30 Weber, Bodo*; Scherer, Erik E.; Martens, Uwe K.; Mezger, Klaus: PROVENANCE AND EVOLUTION OF LOWER PALEOZOIC ROCKS FROM YUCATAN: NEW ISOTOPIC (HF, ND) AND AGE EVIDENCE :50 Helbig, Maria*; Keppie, J. Duncan; Murphy, J. Brendan; Solari, Luigi: THE TRIASSIC JURASSIC AYÚ COMPLEX, SOUTHERN : DERIVATION FROM THE WESTERN MARGIN OF PANGEA-A :10 Ortega-Obregón, Carlos*; Solari, Luigi; Ortega-Gutiérrez, Fernando; Elias-Herrera, Mariano: ARC-RELATED INTRUSIONS IN THE OAXACAN COMPLEX: EVIDENCE FOR EARLY TO LATE PERMIAN PACIFIC PLATE SUBDUCTION BENEATH THE WEST CENTRAL MARGIN OF GONDWANA :30 Keppie, John Duncan*; Galaz-Escanilla, Gonzalo; Helbig, Maria; Kirsch, Moritz; Dostal, Jaroslav; Murphy, J. Brendan; Nance, R. Damian: MEXICAN MARGIN OF PANGÆA: LATE PALEOZOIC TECTONIC SWITCHING FOLLOWED BY EARLY MESOZOIC SHIFT FROM ISLAND TO CONTINENTAL ARC DURING PANGÆA BREAKUP :50 Keppie, D. Fraser*; Keppie, J. Duncan: AN ALTERNATIVE RECONSTRUCTION OF PANGEA A FOR MIDDLE AMERICA WITH BOTH THE CHORTIS AND YUCATAN BLOCKS IN THE GULF OF SESSION NO. 15 T9. What Fossil Ages and Distributions Tell Us about the History of the Ancient Gulf of California 14:30, Hotel Misión Juriquilla, Siglo XVIII Judith Smith, Ana Luisa Carreño, and Javier Helenes, Presiding :30 Helenes, Javier*; Carreño, A. Luisa: KEYNOTE: NEOGENE MICROPALEONTOLOGY AND EVOLUTION OF THE NORTHERN GULF OF CALIFORNIA :50 López-Pérez, Ramón Andrés*: THE GULF OF CALIFORNIA AND THE ORIGIN OF THE MODERN EASTERN PACIFIC CORAL FAUNA :10 Dolby, Greer A.*; Ellingson, Ryan; Day, Paul P.; Jacobs, David K.: HOW ORIGINATION OF MODERN FISH LINEAGES MAY REFLECT TIMING OF WHEN THE GULF OF CALIFORNIA OPENED: A NEW BIOLOGICAL APPROACH :30 Bennett, Scott E.K.*; Oskin, Michael E.; Dorsey, Rebecca J.; Iriondo, Alex: VOLCANIC ROCKS AND MICROFOSSILS CONFIRM A LATE MIOCENE AGE FOR MARINE STRATA ON ISLA TIBURON, GULF OF CALIFORNIA :50 Smith, Judith Terry*: TERTIARY-CARIBBEAN MOLLUSKS AND THE ANCIENT GULF OF CALIFORNIA :10 Vera, Diego*; González, Gerardo; Nava, Enrique: MARINE INVERTEBRATES PALEONTOLOGY OF THE SAN JUAN MEMBER (EL CIEN FORMATION), BAJA CALIFORNIA SUR, :30 Morales-Ortega, Priscila*; González-Barba, Gerardo; Nava-Sánchez, Enrique H.: PALEONTOLOGICAL CORRELATION OF MACROINVERTEBRATES IN THE BATEQUE AND TEPETATE FORMATIONS (PALEOCENE- EOCENE) IN WESTERN BAJA CALIFORNIA SUR, SESSION NO. 16 T13. Heterogeneous Geologic Formations: Modeling Spatial Variability 15:00, Hotel Misión Juriquilla, Goyesco 1 Eric Morales Casique and Martín Díaz Viera, Presiding :00 Franco-Estrada, Berenice*; Pinales-Munguía, Adán; Estrada-Gutiérrez, Guadalupe; Villalba, María de Lourdes; Franco-Rubio, Miguel: MATHEMATICAL MODELING OF CHIHUAHUA-SACRAMENTO, TABALAOPA-ALDAMA AND EL SAUZ-ENCINILLAS AQUIFERS USING VISUAL MODFLOW :20 Casar-Gonzalez, Ricardo*; Diaz-Viera, Martin Alberto; Mendez-Venegas, Javier; Hernandez-Maldonado, Victor; Checa-Rojas, Paola: THE ROLE OF GEOSTATISTICS IN GEOLOGICAL AND PETROPHYSICAL OIL RESERVOIR MODELING :40 Morales-Casique, Eric*; Medina, Priscila; Escolero-Fuentes, Oscar; Hernandez-Espriú, Antonio: MODELING SPATIAL DISTRIBUTION OF HYDROFACIES USING TRANSITION PROBABILITIES :00 Diaz-Viera, Martin Alberto*; Mendez-Venegas, Javier; Hernandez-Maldonado, Victor: SPATIAL STOCHASTIC MODELS AS A POWERFUL TOOL FOR UNCERTAINTY MODELING IN HETEROGENEOUS RESERVOIR FORMATIONS :20 Medina, Priscila*; Morales, Eric: GEOSTATISTICAL ANALYSIS OF LITHOFACIES IN THE AQUIFER OF CITY SESSION NO. 17 T17. Environmental Geochemistry II 14:30, Hotel Misión Juriquilla, Goyesco 1 Mario Villalobos, Laura E. Beramendi-Orosco, Francisco Romero, Priyadarsi Roy, and Ofelia Morton, Presiding :30 Hudson-Edwards, Karen A.*; Jamieson, Heather E.; Lottermoser, Bernd G.: KEYNOTE: MINE WASTES: PAST, PRESENT, FUTURE 2012 GSA Cordilleran Section Meeting 45

20 SESSION NO. 18 SESSION NO. 18 T1. Silicic Volcanism I FRIDAY, 30 MARCH 2012 morning Oral Technical Sessions 08:30, Hotel Misión Juriquilla, Juarez 3 Cathy J. Busby and Graham Andrews, Presiding :30 Arciniega-Ceballos, Alejandra*; Dawson, P.; Chouet, B.: SOURCE CHARACTERIZATION OF LP SEISMICITY AT POPOCATEPETL VOLCANO, :50 Borselli, Lorenzo*; Sarocchi, Damiano: FLANK COLLAPSE AND NEW RELATIVE INSTABILITY ANALYSIS TECHNIQUES APPLIED TO VOLCÁN DE COLIMA AND MT. ST. HELENS :10 Morgan, J.R.*; Morgan, George J.; Pecha, Mark: U/PB DATING OF TUFFS FROM THE ALVERSON VOLCANICS IN THE FOSSIL CANYON AND PAINTED GORGE AREAS OF THE COYOTE MOUNTAINS, WESTERN SALTON TROUGH, CALIFORNIA, USA :30 Glazner, Allen F.*; Bartley, John M.; Law, Bryan; Coleman, Drew S.: LADDER DIKES, CRAZY GEOCHEMISTRY, AND LIQUID IMMISCIBILITY(?) IN OTHERWISE SANE GRANODIORITES :50 Carrasco-Núñez, Gerardo*; Willcox, Christopher; Dávila-Harris, Pablo; Branney, Michael: EXPLOSIVE ERUPTION HISTORY AND STRUCTURE OF A LARGE SILICIC PIECEMEAL CALDERA: LOS HUMEROS, CENTRAL :10 Martiny, Barbara M.*; Morán-Zenteno, Dante J.; de Silva, Shanaka; Zuñiga-Lagunes, Lilibeth; Flores-Huerta, Diana; Solari, Luigi; Martínez-López, Margarita; Roberge, Julie; González-Torres, Enrique A.: PROGRESSIVE CONSTRUCTION OF A BATHOLITH UNDER THE TILZAPOTLA-TAXCO REGION, SOUTHERN, IN LATE EOCENE TIME 10:30 Break :50 McDowell, Fred W.*; McIntosh, William: KEYNOTE: TIMING OF INTENSE MAGMATIC EPISODES IN THE NORTHERN AND CENTRAL SIERRA MADRE OCCIDENTAL, WESTERN :20 Henry, Christopher D.*; McIntosh, William C.; McDowell, Fred W.; Lipman, Peter W.; Chapin, Charles E.: THE CENOZOIC IGNIMBRITE FLAREUP IN WESTERN NORTH AMERICA: DISTRIBUTION, TIMING, VOLUME, AND TECTONIC RELATIONS :40 Miller, Jonathan*; Ryan, Mark; Miller, Calvin; Claiborne, Lily Lowery; Johnson, Brent; Colombini, Lindy L.S.; Wooden, Joseph L.; Walker, Barry A. Jr.; Lidzbarski, Marsha: INSIGHTS INTO THE GROWTH OF SILICIC MAGMA SYSTEMS FROM THE GEOCHRONOLOGIC, ELEMENTAL, AND ISOTOPIC RECORD OF ZIRCON IN MIOCENE PLUTONS AND VOLCANIC ROCKS OF THE COLORADO RIVER EXTENSIONAL CORRIDOR, NEVADA :00 Miller, Calvin F.*; Padilla, Abraham De Jesus; Pamukcu, Ayla; Carley, Tamara L.; Claiborne, Lily L.; Flanagan, Daniel M.; Gualda, Guilherme A.R.; Wooden, Joseph L.; Miller, Jonathan; Lidzbarski, Marsha: REINVIGORATING STAGNANT SILICIC MAGMA SYSTEMS: VOLCANIC AND PLUTONIC VIEWS :20 Roberge, Julie*; de Silva, Shanaka; Viramonte, Jose G.; Arnosio, Marcelo; Beccio, Raúl: MAGMA DYNAMICS OF THE CERRO BLANCO VOLCANIC COMPLEX, ARGENTINA, BASED ON VOLATILES, MAJOR AND TRACE ELEMENTS IN MELT INCLUSIONS SESSION NO. 19 T3. Convergent Margin of Western Pangea: Triassic-Jurassic Magmatism, Sedimentation, and Tectonics from Colombia to Oregon 08:30, Hotel Misión Juriquilla, Goyesco 1 Timothy F. Lawton, José Rafael Barboza-Gudiño, and Roberto Molina-Garza, Presiding 08:30 Introductory Remarks :40 Franco-Rubio, Miguel*; Caballero-Miranda, Cecilia I.; Alva-Valdivia, Luis M.; Oviedo, Angelica; Urrutia-Fucugauchi, Jaime; Martínez-Reyes, Fernando; Torres-Knight, Ricardo; Riggs, Nancy R.; González-León, Carlos M.; López-Santillán, Roberto: PERMIAN MAGMATIC ARC RELATED TO THE OUACHITA SUTURE ZONE IN CHIHUAHUA, :00 Barboza, Rafael*; Zavala, Aurora: MEXICAN LATE PALEOZOIC-EARLY MESOZOIC REMNANT BASIN AT THE WESTERNMOST CULMINATION OF THE OUACHITA- MARATHON BELT :20 Riggs, Nancy R.*; Howell, Evan R.; Oberling, Zachary A.; Barth, Andrew P.; Walker, J. Douglas: ASSESSING SOURCES OF ZIRCONS IN UPPER TRIASSIC SEDIMENTARY STRATA AND THEIR RELATION TO THE CORDILLERAN MAGMATIC ARC :40 Bayona, Germán*; Cardona, Agustin; Vásquez, Mónica; Montes, Camilo: SUBDUCTION TO RIFT-RELATED EVOLUTION OF TRIASSIC AND JURASSIC ROCKS IN THE NORTHERN ANDES :00 Ortega-Flores, Berlaine*; Solari, Luigi; Ortega-Obregón, Carlos: DETRITAL ZIRCON U-PB GEOCHRONOLOGY OF THE TOLIMAN SEQUENCES, CENTRAL : POSSIBLE PROVENANCE SOURCES 10:20 Break :40 Lawton, Timothy F.*; Gilbert, John C.; Amato, Jeffrey M.: AGE OF THE JURASSIC ARC SYSTEM IN SOUTHERN ARIZONA :00 Molina Garza, Roberto*: ARE THERE TOO MANY RIFT BASINS IN? :20 Silva-Tamayo, Juan Carlos*; Cardona, Agustin; Bayona, Germán; Pardo, Andres; Sial, Alcides N.; Valencia, Victor; Montes, Camilo; Alvarez, Alejandtra; Jimenez, Harold: MULTI-PROXY AGE CONSTRAINS OF LOWER CRETACEOUS MARINE EXTENSION AND OCEANIC ANOXIA IN NORTHERN COLOMBIA: PALEOGEOGRAPHIC IMPLICATIONS :40 Zapata, Sebastian*; Cardona, Agustin; Bayona, Germán; Bustamante, Camilo; Mora, Andrés; Silva-Tamayo, Juan Carlos; Valencia, Victor: TRACING MAJOR CHANGES IN MIDDLE MESOZOIC PLATE CONVERGENCE IN THE NORTHERN ANDES: INSIGHTS FROM THE JURASSIC MAGMATIC RECORD OF SOUTHERN COLOMBIA :00 Pignotta, Geoffrey*; Ostrenga, Will; Nushart, Nathan: TIME TRANSGRESSIVE STRAIN RECORDED JURASSIC AND EARLY CRETACEOUS PLUTONS OF THE CENTRAL COAST PLUTONIC COMPLEX, BELLA COOLA, BRITISH COLUMBIA, CANADA :20 Castonguay, Samuel R.*; Miller, Marli Bryant: IMBRICATE THRUST FAULTS AND TIGHT FOLDS IN NEOPROTEROZOIC FORMATIONS OF THE VIRGIN SPRING-AMARGOSA CHAOS OF SOUTHERN DEATH VALLEY, CA GSA Abstracts with Programs

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