Geological Society of America

1:30 PM

U-PB APATITE AND SPHENE THERMOCHRONOLOGY DOCUMENTING MID-CRUSTAL TEMPERATURE GRADIENTS DURING ARCHEAN LITHOSPHERIC STABILIZATION, KAAPVAAL CRATON, SOUTHERN AFRICA

Blair Schoene, Massachusetts Institute of Technology, Cambridge, MA and Alexander Tye, Utah Tech University, St. George, UT and Samuel A. Bowring, Massachusetts Institute Technology, Cambridge, MA and Alyssa Abbey, California State University Long Beach, Long Beach, CA

57617 (Technical Sessions)

1:45 PM

FATE OF PB IN AN ARCHEAN ZIRCON

Satoshi Utsunomiya, Univ of Michigan, Ann Arbor, MI and Christopher S. Palenik, Univ of Michigan, Ann Arbor, MI and Rodney C. Ewing, Univ of Michigan, Ann Arbor, MI and John W. Valley, Univ of Wisconsin, Madison, WI and Aaron J. Cavosie, Univ of Wisconsin, Madison, WI and Simon A. Wilde, Curtin Univ, Bentley, N/A

63649 (Technical Sessions)

2:15 PM

ARCHEAN (2.7 GA) SEAWATER SALINITY – CONSTRAINTS FROM FLUID INCLUSION MICROTHERMOMETRY, BEN NEVIS AREA, ABITIBI GREENSTONE BELT, ONTARIO, CANADA

Lars Weiershäuser, Univ of Toronto, Toronto, ON and Ed T.C. Spooner, Univ of Toronto, Toronto, ON

59926 (Technical Sessions)

2:30 PM

DATING SEDIMENTARY SEQUENCES: IN SITU U/TH-PB MICROPROBE DATING OF EARLY DIAGENETIC MONAZITE AND AR-AR DATING OF MARCASITE NODULES: CASE STUDY FROM NEOPROTEROZOIC BLACK SHALES IN THE SOUTHWESTERN U.S

Michael L. Williams, Univ of Massachusetts, Amherst, MA and Laura J. Crossey, Univ. of New Mexico, Albuquerque, NM and Michael J. Jercinovic, Univ of Massachusetts, Amherst, MA and Laura Crossey, 1609 Stanford NE, Albuquerque, NM and Karl E. Karlstrom, Univ of New Mexico, Albuquerque, NM and Carol M. Dehler, Utah State Univ, Logan, UT and Matthew T. Heizler, New Mexico Tech, Socorro, NM and Samuel A. Bowring, Massachusetts Institute Technology, Cambridge, MA and Philippe Goncalves, UMASS, Amherst, MA

59737 (Technical Sessions)

2:45 PM

NEOPROTEROZOIC GLACIATIONS: NEW DATA FROM QURUQTAGH, EASTERN CHINESE TIANSHAN

Shuhai Xiao, Virginia Poltechnic Institute and State Univ, Blacksburg, VA and Huiming Bao, Louisiana State Univ, Baton Rouge, LA and Alan J. Kaufman, Univ of Maryland, College Park, MD and Chuanming Zhou, Chinese Academy of Sciences, Nanjing, N/A and Xunlai Yuan, Chinese Academy of Sciences, Nanjing, N/A

62057 (Technical Sessions)

3:00 PM

CHEMOSTRATIGRAPHY OF NEOPROTEROZOIC 'CAP' CARBONATES FROM THE VOLTA BASIN, WEST AFRICA

Susannah M. Porter, UC Santa Barbara, Santa Barbara, CA and Andrew H. Knoll, Harvard Univ, Cambridge, MA and Pascal Affaton, CEREGE, Aix-en-Provence, N/A

64404 (Technical Sessions)

3:15 PM

MICROBIAL CRUSTS AS THE EARLIEST LIFE ON LAND

Robert H. Dott, Univ of Wisconsin, Madison, WI and L. Gordon Medaris, Univ of Wisconsin, Madison, WI

63170 (Technical Sessions)

3:30 PM

STRUCTURAL AND GEOCHRONOLOGIC EVIDENCE FOR MESOPROTEROZOIC (CA. 1570 MA) REACTIVATION OF THE CHEYENNE BELT SUTURE ZONE, SOUTHEASTERN WYOMING

Diana Strickland, Univ of Wyoming, Laramie, WY and Ernest Duebendorfer, Northern Arizona Univ, Flagstaff, AZ and Kevin Chamberlain, Univ of Wyoming, Laramie, WY and Matthew Heizler, New Mexico Bureau of Mines and Mineral Rscs, Socorro, NM

66488 (Technical Sessions)

3:45 PM

PALEOPROTEROZOIC HISTORY OF THE GREAT FALLS TECTONIC ZONE: RESULTS FROM AN INTEGRATED STUDY OF BASEMENT EXPOSURES IN THE LITTLE BELT MOUNTAINS, MONTANA

James J. Vogl, Univ of Florida, Gainesville, FL and Paul A. Mueller, Univ of Florida, Gainesville, FL and David A. Foster, Univ of Florida, Gainesville, FL and J.L. Wooden, U. S. Geol Survey, Menlo Park, CA

60490 (Technical Sessions)

4:00 PM

PROTEROZOIC METAMORPHISM IN THE TOBACCO ROOT MOUNTAINS, MONTANA: PTT PATH AND 207PB/206PB ION MICROPROBE AGES OF MONAZITE

John T. Cheney, Amherst College, Amherst, MA and John B. Brady, Smith College, Northampton, MA and Tekla A. Harms, Amherst, Amherst, MA and H. Robert Burger, Smith College, Northampton, MA

61600 (Technical Sessions)

4:15 PM

PROTOLITH AND TECTONIC SETTING FOR PRECAMBRIAN METAMORPHIC ROCKS, TOBACCO ROOT MOUNTAINS, MONTANA: AN INTEGRATED VIEW

John B. Brady, Smith College, Northampton, MA and H. Robert Burger, Smith College, Northampton, MA and John T. Cheney, Amherst College, Amherst, MA and Tekla A. Harms, Amherst College, Amherst, MA and David W. Mogk, Montana State Univ, Bozeman, MT and William H. Peck, Colgate Univ, Hamilton, NY

63011 (Technical Sessions)

4:30 PM

CHARACTER AND EVOLUTION OF THE 1.78-1.72 GA BIG SKY OROGENY IN THE TOBACCO ROOT MOUNTAINS, MONTANA

H. Robert Burger, Smith College, Northampton, MA and Tekla A. Harms, Amherst College, Amherst, MA and John T. Cheney, Amherst College, Amherst, MA and John B. Brady, Smith College, Northampton, MA

63038 (Technical Sessions)

4:45 PM

THE PALEOPROTEROZOIC GEOLOGY OF THE NORTHERN HUALAPAI MOUNTAINS, ARIZONA, AND ITS IMPLICATIONS FOR THE MOJAVE PROVINCE/TRANSITION ZONE BOUNDARY IN NORTHWESTERN ARIZONA

Benjamin R. Siwiec, Northern Arizona Univ, Flagstaff, AZ and Ernest M. Duebendorfer, Northern Arizona Univ, Flagstaff, AZ

63596 (Technical Sessions)

5:00 PM

ADDITIONAL EVIDENCE FOR A MAJOR ARCHEAN TERRANE BOUNDARY NEAR THE GRENVILLE FRONT IN ONTARIO

Robert Michael Easton, Ontario Geol Survey, Sudbury, ON and S.L. Kamo, Royal Ontario Museum, Toronto, ON

65278 (Technical Sessions)

5:15 PM

MULTIPLE PROTEROZOIC METAMORPHIC EVENTS IN THE GRENVILLE PROVINCE, NORTHWESTERN NEW YORK STATE: EVIDENCE FROM ION MICROPROBE (SHRIMP) ANALYSIS

M.M. Streepey, Florida State Univ, Tallahassee, FL and P.S. Dahl, Kent Univ, Kent, OH and J.L. Wooden, Stanford Univ, Stanford, CA

67618 (Technical Sessions)

239 Precambrian Geology

Presentations