Session No. T1 Tuesday, June 26, 2001

10:00 AM-4:30 PM, Edinburgh International Conference Centre: Sidlaw
T1. Archean Earth and Contemporary Life: The Transition from an Anaerobic to an Aerobic Marine Ecosystem (Sponsored by NASA Astrobiology Institute)
Janet Siefert and Toby Tyrrell, Presiding
Start Time
10:00 AM A POSSIBLE EXPLANATION FOR THE GREAT OXIDATION EVENT BETWEEN CA. 2.3 AND 2.0 GA: HOLLAND, Heinrich D. and YANG, Wenbo, Earth and Planetary Sciences, Harvard Univ, 20 Oxford Street, Cambridge, MA 02138, holland@eps.harvard.edu
10:30 AM GEOCHEMICAL EVIDENCE FOR OXYGENATED ARCHEAN OCEANS: OHMOTO, Hiroshi1, YAMAGUCHI, Kosei E.1, WATANABE, Yumiko1, NARAOKA, Hiroshi2, KAKEGAWA, Takeshi3, and LASAGA, Antonio C.4, (1) Astrobiology Research Center & Dept. of Geosciences, The Pennsylvania State Univ, 435 Deike Bld, University Park, PA 16802, ohmoto@geosc.psu.edu, (2) Chemistry, Tokyo Metropolitan Univ, Tokyo, (3) Research Center for Environmental Geochemistry, Tohoku Univ, Sendai, Japan, (4) Geology & Geophysics, Yale Univ, New Haven, CT 06520
10:50 AM THE ARCHEAN ATMOSPHERE PRIOR TO THE RISE OF OXYGEN: KASTING, James F. and PAVLOV, Alexander A., Geosciences, Penn State University, 443 Deike, University Park, PA 16802, kasting@essc.psu.edu
11:10 AM BIOGENIC METHANE, HYDROGEN ESCAPE, AND THE IRREVERSIBLE OXIDATION OF EARLY EARTH: CATLING, David C.1, ZAHNLE, Kevin J.2, and MCKAY, Christopher P.2, (1) Space Science Division, NASA Ames Rsch Ctr/SETI Institute, Mail Stop 245-3, Moffett Field, CA 94035-1000, catling@humbabe.arc.nasa.gov, (2) Space Science Division, NASA Ames Rsch Ctr, Mail Stop 245-3, Moffett Field, CA 94035-1000
11:30 AM THE ARCHEAN-PROTEROZOIC TRANSITION: CARBON ISOTOPIC INDICATORS OF CHANGE: DES MARAIS, David J., NASA Astrobiology Institute, Mail Stop 239-4, Ames Research Center, Moffett Field, CA 94035-1000, ddesmarais@mail.arc.nasa.gov.
11:50 AM CHARACTERIZING OXYGEN LEVELS IN THE PRECAMBRIAN OCEAN USING FE/AL AND MO/AL RATIOS IN SHALES: LYONS, Timothy W., Department of Geological Sciences, Univ of Missouri, Columbia, MO 65211, lyonst@missouri.edu and FORMOLO, Michael J., Department of Geological, Univ of Missouri, Columbia, MO 65211,
12:10 PM MIDDLE PROTEROZOIC OCEAN CHEMISTRY: CANFIELD, Donald Eugene1, SHEN, Yanan1, and KNOLL, Andy2, (1) Danish Center for Earth System Science (DCESS) and Institute of Biology, Odense Univ, SDU, Campusvej 55, Odense M, 5230, Denmark, dec@biology.ou.dk, (2) Botanical Museum, Harvard Univ, Cambridge, MA 02139
12:30 PM Lunch
1:50 PM THE 500 MA DELAY IN THE RISE OF ATMOSPHERIC O2 AND THE EVOLUTION OF COUPLED BIOGEOCHEMICAL CYCLES: FALKOWSKI, Paul G. and BERMAN-FRANK, Ilana, Dept of Geology, and Institute of Marine and Coastal Sciences, Rutgers Univ, New Brunswick, NJ 08901, falko@imcs.rutgers.edu
2:20 PM PHOSPHATE IN BIF'S: IMPLICATIONS FOR THE ARCHEAN BIOSPHERE: BJERRUM, Christian J., Danish Center for Earth System Science, Univ of Copenhagen, Juliane Maries Vej 30, Copenhagen OE, 2100, Denmark, cjb@dcess.ku.dk and CANFIELD, Donald E., Danish Center for Earth System Science, Univ of Southern Denmark, Campusvej 55, Odense M, 5230, Denmark,
2:40 PM METHANE-CONSUMING MICROBIAL CONSORTIA IDENTIFIED AND STUDIED USING A NOVEL COMBINATION OF FLUORESCENT IN-SITU HYBRIDIZATION AND ION MICROPROBE d13C ANALYSIS: HOUSE, Christopher H., Pennsylvania State Univ, 208 Deike Bldg, University Park, PA 16802-2711, chouse@geosc.psu.edu, ORPHAN, Victoria J., Monterey Bay Aquarium Research Institute, CA, MCKEEGAN, Kevin D., Department of Earth and Space Sciences, UCLA, Los Angeles, CA, and HINRICHS, Kai-Uwe, Department of Geology and Geophysics, Woods Hole Oceanographic Institution, 360 Woods Hole Road, Clark Bldg., MS # 22, Woods Hole, MA 02543,
3:00 PM Break
3:10 PM A GENOMIC TIMESCALE FOR THE RISE IN OXYGEN AND ORIGIN OF EUKARYOTES: HEDGES, S. Blair1, CHEN, Hsiong1, WANG, Daniel1, THOMPSON, Amanda S.1, KUMAR, Sudhir2, and WATANABE, Hidemi3, (1) Department of Biology and Astrobiology Research Center, Pennsylvania State Univ, 208 Mueller Lab, University Park, PA 16802, sbh1@psu.edu, (2) Biology, Arizona State Univ, P.O. Box 871501, Tempe, AZ 85287-1501, (3) Human Genome Research Group, RIKEN Genomic Sciences Ctr, Suehirochou 1-7-22, Tsurumi-ku, Yokohama, 230-0045, Japan
3:30 PM HOW OLD IS AEROBIC PHOTOSYNTHESIS? A FRESH LOOK AT THE FOSSIL EVIDENCE: BRASIER, Martin D., Earth Sciences, Univ of Oxford, Parks Road, Oxford, OX1 3PR, United Kingdom, martinb@earth.ox.ac.uk, GREEN, Owen R., Earth Sciences, Univ of Oxford, Parks Rd, Oxford, OX8 1HL, United Kingdom, STEELE, Andrew, Earth, Environmental and Physical Sciences, Univ of Portsmouth, Burnaby Road, Portsmouth, PO1 3QL, United Kingdom, and LINDSAY, John F., Research School of Earth Sciences, Australian National University, Canberra, ACT, 0200, Australia,
3:50 PM THE ROLE OF FERREDOXINS IN THE RISE OF OXYGEN: SIEFERT, Janet L., Statistics, Rice Univ, 6100 Main Street, Houston, TX 77251-1892, siefert@stat.rice.edu and KASTING, James F., Geosciences, Penn State Univ, 443 Deike, Penn State University, University Park, PA 16802,
4:10 PM CYANOBACTERIA: THEN AND NOW: FOX, George E.1, MARTIN, Kirt1, LUE, Yue1, SIEFERT, Janet L.2, WANG, Jia Chen1, and WIDGER, William R.1, (1) Biology and Biochemistry, Univ of Houston, 4800 Calhoun Road, Houston, TX 77204-5513, fox@uh.edu, (2) Statistics, Rice Univ, 6100 Main Street, Houston, 77251-1892

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