Geological Society of America

1:00 PM

PRECAMBRIAN GREENSTONE SEQUENCES REPRESENT DIFFERENT OPHIOLITE TYPES

Harald Furnes, Univ of Bergen, Bergen, N/A and Yildirim Dilek, Miami University, Oxford, Ohio, OH and Maarten deWit, Port Elizabeth, South Africa, N/A

228495 (Technical Sessions)

1:15 PM

3.5 BILLION YEARS OF RESHAPING, DEPLETING AND RESTOCKING KAAPVAAL CRATON CRUST

Maarten J. de Wit, Nelson Mandela Metropolitan University, Port Elizabeth, N/A

227447 (Technical Sessions)

1:30 PM

3.5 GA DEEP-WATER FOSSIL HYDROTHERMAL FIELD AND SUBAERIAL DIAMICTITE ─ HOT ARCHEAN CRUST IN DEEP COOL OCEANS

Maarten J. de Wit, Nelson Mandela Metropolitan University, Port Elizabeth, N/A and Harald Furnes, University of Bergen, Bergen

228302 (Technical Sessions)

1:45 PM

SILICON ISOTOPE COMPOSITION OF ARCHEAN CHERTS FROM >3.7 GA TO 2.7 GA DETERMINED BY SECONDARY ION MASS SPECTROMETRY (SIMS)

Latisha Ashley Brengman, University of Tennessee, Knoxville, TN and Christopher Fedo, University of Tennessee, Knoxville, TN and Martin J. Whitehouse, Swedish Museum of Natural History, Stockholm, N/A

228944 (Technical Sessions)

2:00 PM

LOOKING FOR THE EARLY ARCHEAN ROCKS IN SOUTH AMERICA: U-PB DATING AND HF ISOTOPES IN ZIRCONS FROM THE NORTH SAO FRANCISCO CRATON, BRAZIL

Elton Luiz Dantas, Universidade de Brasilia, Brasilia, N/A and Benjamim Bley Brito Neves, Universidade de São Paulo, São Paulo, N/A and Reinhardt Fuck, Universidade de Brasilia, Brasilia, N/A

233101 (Technical Sessions)

2:15 PM

NEW DETRITAL ZIRCON AGE CONSTRAINTS ON THE PALEOPROTEROZOIC WOLHAARKOP-DRAKENSTEIN LATERITIC PALEOSOL, GAMAGARA KARST LATERITES AND THE LUCKNOW HEAVY CARBONATE CARBON ISOTOPE EXCURSION, GRIQUALAND WEST, SOUTH AFRICA

Nicolas J. Beukes, University of Johannesburg, Johannesburg and Richard da Silva, University of Johannesburg, Auckland Park, N/A and Daphne Dreyer, University of Johannesburg, Auckland Park, N/A and Herman van Niekerk, University of Johannesburg, Auckland Park, N/A and Clarisa Vorster, University of Johannesburg, Auckland Park, N/A and Dirk Frei, Stellenbosch University, Matieland, N/A

227809 (Technical Sessions)

2:45 PM

OXYATMOVERSION AT MILLENIAL RESOLUTION ACCOMPANIES YOUNGEST SIDERIAN SNOWBALL EARTH DEGLACIATION

Timothy D. Raub, University of St. Andrews, St. Andrews and Terry Y.S. Tang, University of St. Andrews, St. Andrews, N/A

233550 (Technical Sessions)

3:00 PM

FLUVIAL IRON FORMATION: A NEW PRECAMBRIAN BIOGEOCHEMICAL SEDIMENTARY SYSTEM, EARAHEEDY BASIN, WESTERN AUSTRALIA

Peir K. Pufahl, Acadia University, Wolfville, NS and Eric E. Hiatt, Univ of Wisconsin-Oshkosh, Oshkosh, WI and Franco Pirajno, Geological Survey of Western Australia, East Perth, N/A

228104 (Technical Sessions)

3:15 PM

HG CONCENTRATIONS AND MASS INDEPENDENT FRACTIONATION IN MID-PROTEROZOIC MARINE SHALES

Alyson M. Thibodeau, Dickinson College, Carlisle, PA and Bridget A. Bergquist, University of Toronto, Toronto, ON and Linda C. Kah, University of Tennessee, Knoxville, TN and Robert M. Hazen, Carnegie Institution of Washington, Washington DC and Shuhei Ono, Massachusetts Institute of Technology, Cambridge, MA and Sanghamitra Ghosh, University of Toronto, Toronto, ON

231198 (Technical Sessions)

3:30 PM

TRACKING THE CHEMOCLINE IN ANCIENT OCEANS: AN EXAMPLE FROM THE MESOPROTEROZOIC OF MAURITANIA

Geoffrey Gilleaudeau, George Mason University AOES, Fairfax, VA and Linda C. Kah, University of Tennessee, Knoxville, TN

222848 (Technical Sessions)

3:45 PM

CALCITIZED EVAPORITES AND THE EVOLUTION OF EARTH’S EARLY BIOSPHERE

Ashley R. Manning-Berg, University of Tennessee, Knoxville, TN and Linda C. Kah, University of Tennessee, Knoxville, TN

222847 (Technical Sessions)

269 Precambrian Geology

Presentations