2007 GSA Denver Annual Meeting (28–31 October 2007)

Session No. 1
Sunday, 28 October 2007: 8:00 AM-12:00 PM

Geochemistry

 

Liliana Lefticariu, Chair
Paper #
Start Time
1
8:00 AM
PER MIL 238U/235U VARIATIONS IN URANIUM ORES: EVIDENCE FOR ISOTOPIC FRACTIONATION BY NUCLEAR FIELD SHIFT?
BOPP IV, Charles John and LUNDSTROM, Craig, Geology, UIUC, 1301 W.Green St., 245NHB, Urbana, IL 61801, cbopp2@uiuc.edu, cbopp2@uiuc.edu
2
8:15 AM
APPLICATION OF X-RAY MICRO-COMPUTED TOMOGRAPHY IN (U-TH)/HE THERMOCHRONOLOGY
MCINNES, Brent I.A.1, EVANS, Noreen J.1, AUSTIN, Peter J.2, SQUELCH, Andrew3, MCDONALD, Bradley J.1 and WU, Qianhong4, (1)John deLaeter Centre for Mass Spectrometry, CSIRO Exploration and Mining, PO Box 1130, Bentley, WA, 6102, Australia, (2)Parker Centre for Integrated Hydrometallury Solutions, CSIRO Minerals, Waterford, 6151, Australia, (3)iVEC, CSIRO Exploration and Mining, PO Box 1130, Bentley, Perth, 6102, Australia, (4)Geology, Central South University, Zuojialong, Changsha, Hunan, 410083, China, Brent.McInnes@csiro.au, Brent.McInnes@csiro.au
3
8:30 AM
THE EFFECT OF GRAIN SIZE ON THE CLOSURE TEMPERATURE OF HE IN CALCITE: A CASE STUDY FROM THE MIOCENE BARSTOW FORMATION
COPELAND, Peter, Geoscience, University of Houston, 4800 Calhoun, Houston, TX 77204, RASBURY, Troy, Dept of Geosciences, Stony Brook University, Stony Brook, NY 11794 and WATSON, E. Bruce, Earth and Environmetal Sciences, Rensselaer Polytechnic Institute, Jonsson-Rowland Science Center 1W19, 110 8th Street, Troy, NY 12180-3590, copeland@uh.edu, copeland@uh.edu
4
8:45 AM
MODELING DIFFUSION PHENOMENA IN MINERALS: THE CASE OF HELIUM IN ZIRCON (U-TH)/HE THERMOCHRONOMETER
REICH, Martin, Department of Geology, School of Engineering and Science, University of Chile, Plaza Ercilla 803, Casilla 13518 Correo 21, Santiago, Chile, EWING, Rodney C., Department of Earth and Environmental Sciences, University of Michigan, C.C. Little Bldg, 1100 N. University Avenue, Ann Arbor, MI 48109-1005, EHLERS, Todd A., Geological Sciences, University of Michigan, 2534 C.C. Little Building, 1100 North University, Ann Arbor, MI 48109-1005 and BECKER, Udo, Department of Earth and Environmental Sciences, Univ of Michigan, 1100 North University Avenue, C.C.Little Building, Ann Arbor, MI 48109-1063, mreich@ing.uchile.cl, mreich@ing.uchile.cl
5
9:00 AM
RADIOLYTIC OXIDATION OF PYRITE BY GAMMA RADIATION
LEFTICARIU, Liliana, Department of Geology, Southern Illinois University, 1259 Lincoln Drive, Carbondale, IL 62901, PRATT, Lisa, IPTAI, Dept. of Geological Sciences, Indiana University, Bloomington, IN 47405, RIPLEY, Edward, Department of Geological Sciences, Indiana University, Bloomington, IN 47405 and LAVERNE, Jay, Radiation Laboratory, University of Notre Dame, Notre Dame, IN 47405, lefticariu@geo.siu.edu, lefticariu@geo.siu.edu
6
9:15 AM
THERMOBAROMETRY OF >4 GA ZIRCONS: TOWARDS A HADEAN GEOTHERM
HOPKINS, M.D., Earth and Space Sciences and IGPP, University of California, Los Angeles, Box 951567, Los Angeles, CA 90095 and HARRISON, T.M., Earth and Space Sciences and IGPP, University of California,Los Angeles, Box 951567, Los Angeles, CA 90095-1567, mdhop1@ucla.edu, mdhop1@ucla.edu
7
9:30 AM
CONCENTRATION AND CARBON ISOTOPE COMPOSITION OF FE(CO3)OH IN PEDOGENIC GOETHITE OF A MID-CRETACEOUS PALEOSOL IN SOUTHWESTERN MINNESOTA
FENG, Weimin, Department of Geological Sciences, University of Texas at Austin, Austin, TX 78712 and YAPP, Crayton, Dallas, TX 75275, weimin.feng@gmail.com, weimin.feng@gmail.com
 
9:45 AM
Break
8
10:00 AM
OXYGEN ISOTOPE DATA FROM HYDROTHERMALLY ALTERED ARCHEAN PLUTONS: CONSTRAINTS ON THE ISOTOPIC EVOLUTION OF THE HYDROSPHERE
BANERJEE, Sandeep, GREGORY, Robert T., RICHARDS, Ian and FERGUSON, Kurt, Geological Sciences, Southern Methodist University, 3225 Daniel Avenue, Dallas, TX 75275, sbanerje@smu.edu, sbanerje@smu.edu
9
10:15 AM
SEA SURFACE TEMPERATURE CHANGE FROM LATE ORDOVICIAN δ18O DATA, BROMIDE AND VIOLA SPRINGS FORMATIONS, OKLAHOMA, USA
ROSENAU, Nicholas A., Department of Earth Sciences, University of Arkansas at Little Rock, Little Rock, AR 72204, LESLIE, Stephen A., Department of Geology and Environmental Sciences, James Madison University, Harrisonburg, VA 22801 and HERRMANN, Achim D., Geology & Geophysics, Louisiana State University, Baton Rouge, LA 70803, nxrosenau@ualr.edu, nxrosenau@ualr.edu
10
10:30 AM
MOLECULAR SIGNATURES FOR CHANGES IN POPULATIONS OF NITROGEN-FIXING CYANOBACTERIA IN RESPONSE TO FLUCTUATIONS IN OXYGENATION LEVELS DURING THE EARLY APTIAN OCEANIC ANOXIC EVENT
BRASSELL, Simon C., Geological Sciences, Indiana Univ, 1001 East Tenth Street, Bloomington, IN 47405-1405 and DUMITRESCU, Mirela, ExxonMobil Exploration Company, 233 Benmar Drive, Houston, TX 77060, simon@indiana.edu, simon@indiana.edu
11
10:45 AM
d15N AND d18O OF NITRATE AND THE INFLUENCE OF ANTHROPOGENIC INPUTS ON THE SURFACE WATER NITRATE BUDGET IN ANCHORAGE, ALASKA, USA
SJOSTROM, Derek, Geology, Rocky Mountain College, 1511 Poly Drive, Billings, MT 59102 and MUNK, LeeAnn, Department of Geological Sciences, University of Alaska Anchorage, 3211 Providence Drive, Anchorage, AK 99508, derek.sjostrom@rocky.edu, derek.sjostrom@rocky.edu
12
11:00 AM
LATTICE BOLTZMANN SIMULATION OF OXYGEN- AND HYDROGEN-ISOTOPE FRACTIONATIONS DURING SNOW CRYSTAL FORMATION
LU, Guoping, Earth Sciences Division, Lawrence Berkeley National Laboratory, MS 90-1116, 1 Cyclotron Road, Berkeley, CA 94720 and DEPAOLO, Donald J., Earth Sciences Division, Lawrence Berkeley National Laboratory, Mailstop 90-1110, Berkeley, CA 94720, gplu@lbl.gov, gplu@lbl.gov
14
11:30 AM
REFINED GEOCHEMISTRY OF THE PAINTBRUSH GROUP TUFFS AT YUCCA MOUNTAIN, NEVADA
PETERMAN, Zell E., U.S. Geol Survey, MS 963 Box 25046 DFC, Denver, CO 80225 and SPENGLER, Richard, U.S. Geol Survey, Denver Federal Center, Denver, CO 80225, peterman@usgs.gov, peterman@usgs.gov
15
11:45 AM
EFFECTS OF TEMPERATURE ON THE COMPOSITION OF SOLUBLE SALTS IN DUST AT YUCCA MOUNTAIN, NEVADA
OLIVER, Thomas A., U.S. Geological Survey, Denver Federal Center, MS 963, Box 25046, Denver, CO 80225, taoliver@usgs.gov, taoliver@usgs.gov
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