Session No. 6 Monday, April 30, 2001

1:25 PM-5:00 PM, Sheraton Old Town Hotel: Alvarado AB
S12. Mesoproterozoic Tectonics of the Southwestern United States
Karl Karlstrom and M.L. Williams, Presiding
Start Time
1:25 PM Introductory Remarks
1:30 PM TECTONIC "FINGERPRINT" FOR DEFORMATIONAL HISTORY IN THE COLORADO MINERAL BELT: TWO ~100 MA OROGENIC INTERVALS PUNCTUATED BY ~15 MA TECTONIC PULSES: MCCOY, Annie M., Earth and Planetary Sciences, University of New Mexico, Northrop Hall, Albuquerque, NM 87131, amccoy@unm.edu, SHAW, Colin A., Earth and Planetary Sciences, Univ of New Mexico, Northrop Hall, Albuquerque, NM 87131, KARLSTROM, Karl E., Earth & Planetary Sciences, Univ of New Mexico, Northrop Hall, Albuquerque, NM 87131, and WILLIAMS, Michael L., Department of Geosciences, Univ of Massachusetts, Morrill Science Center, 611 North Pleasant Street, Amherst, MA 01003-5820,
1:45 PM CA. 1.4 GA METAMORPHIC TEMPERATURES OF THE SOUTHWESTERN U.S. ESTIMATED FROM REGIONAL 40AR/39AR DATA: SHAW, Colin A., Earth & Planetary Sciences, Univ of New Mexico, Northrop Hall, 200 Yale Blvd. NE, Albuquerque, NM 87131, colins@unm.edu, KARLSTROM, K. E., Earth & Planetary Sciences, Univ of New Mexico, Northrop Hall, Albuquerque, NM 87131, and HEIZLER, M., New Mexico Bureau of Mines and Mineral Resources, New Mexico Tech, 801 Leroy Place, Socorro, NM 87801,
2:00 PM SYNCHRONOUS SHEARING AND MAGMATISM AT 1430 MA AND SUBSEQUENT MAGMATISM AT 1410 MA IN THE COLORADO PROVINCE: STEIN, Holly J., AIRIE Program, Department of Earth Rscs, Colorado State University, Fort Collins, CO 80523-1482, hstein@cnr.colostate.edu and SIMS, Paul K., US Geol Survey, MS 905, PO Box 25046, Denver, CO 80225-0046,
2:15 PM CONTRASTING LEVELS OF EXPOSURE OF MESOPROTEROZOIC PLUTONS IN THE WET MOUNTAINS, COLORADO: IMPLICATIONS FOR EMPLACEMENT UNDER DYNAMIC VS. SYNTECTONIC CONDITIONS: SIDDOWAY, Christine S., Geology Department, Colorado College, Colorado Springs, CO 80903, csiddoway@ColoradoCollege.edu.
2:30 PM IMPLICATIONS OF NEW AGE CONSTRAINTS ON THE STRUCTURAL AND PETROLOGIC EVOLUTION OF MIDDLE PROTEROZOIC ROCKS IN THE CENTRAL TUSAS MOUNTAINS OF NORTHERN NEW MEXICO: DAVIS, Peter B.1, WILLIAMS, Michael L.1, BOWRING, Samuel A.2, and RAMEZANI, Jahan2, (1) Department of Geosciences, Univ of Massachusetts, Amherst, MA 01003, davis@geo.umass.edu, (2) Earth, Atmospheric & Planetary Sciences, Massachusetts Institute of Technology
2:45 PM NEW GEOCHRONOLOGIC DATA FROM THE SANDIA PLUTON, NEW MEXICO: KIRBY, Eric1, HODGES, Kip V.1, BOWRING, Samuel A.2, and KARLSTROM, Karl E.3, (1) EAPS, MIT, Cambridge, MA 02139, ekirby@mit.edu, (2) EAPS, MIT, Cambridge, MA 02139, (3) Earth & Planetary Sciences, Univ of New Mexico, Northrop Hall, Albuquerque, NM 87131
3:00 PM Break
3:15 PM THERMAL AND HYDROTHERMAL HISTORY OF THE PRIEST PLUTON CONTACT AUREOLE, NEW MEXICO: APPLICATION OF OXYGEN AND HYDROGEN ISOTOPE METHODS: LARSON, Toti Erik and SHARP, Zachary D., Earth and Planetary Sciences, Univ of New Mexico, Northrop Hall, Albuquerque, NM 87131, larson@unm.edu
3:30 PM FABRIC REACTIVATION IN THE HUALAPAI MOUNTAINS, NW ARIZONA: FURTHER CONSTRAINTS ON 1.4 GA TECTONICS: NYMAN, Matthew, Earth and Planetary Science/Natural Science Program, Univ of New Mexico, Northrop Hall, Albuquerque, NM 87131, mwnyman@unm.edu.
3:45 PM SIGNIFICANCE OF RAPAKIVI GRANITES AND COMINGLED DIABASE ENCLAVES AND SYNPLUTONIC DIKES, LITTLE HATCHET MOUNTAINS, NEW MEXICO: MCLEMORE, Virginia T., New Mexico Bureau of Mines and Mineral Resources, New Mexico Institute of Mining and Technology, 801 Leroy Pl, Socorro, NM 87801, ginger@gis.nmt.edu, RAMO, O. Tapani, Univ Helsinki, PO Box 11, Helsinki, 00014, Finland, and KOSUNEN, Paula J., Messenivksenkatu 7 B 37, Helsinki, 00250, Finland,
4:00 PM Poster Summaries:Carrick,Philips,Moyles
4:15 PM MESOPROTEROZOIC TECTONIC EVOLUTION OF TEXAS PRIOR TO THE GRENVILLE OROGENY: MOSHER, Sharon1, CONNELLY, James1, GRIMES, Steve2, HOH, April1, and ZUMBRO, Justin1, (1) Univ Texas - Austin, Dept Geological Sciences, Austin, TX 78712, mosher@mail.utexas.edu, (2) Department of Earth Sciences, Memorial Univ of Newfoundland, St. John's, NF A1B-3X5, Canada
4:30 PM Discussion

Back to the Rocky Mountain (53rd) and South-Central (35th) Sections, GSA, Joint Annual Meeting (April 29–May 2, 2001)