GSA 2020 Connects Online

Session No. 242
Friday, 30 October 2020: 10:00 AM-2:00 PM

T54. Ice-Sheet and Sea-Ice Paleo-Reconstructions from the Arctic, Antarctica, and the Southern Ocean

GSA Marine and Coastal Geoscience Division; GSA Sedimentary Geology Division; GSA Quaternary Geology and Geomorphology Division

 

Sandra Passchier, Suzanne O'Connell, Victoria L. Peck and Kristen St. John, Advocates
Paper #
Start Time
10:00 AM
GEOCHEMICAL EVIDENCE FOR THE DISCHARGE OF METEORIC FLOW TO THE CHUKCHI SEA SUGGESTIVE OF A SUBSURFACE FLOW PULSE DURING THE EARLY HOLOCENE THERMAL MAXIMUM (EHTM) (Invited Presentation)
TORRES, Marta E.1, KIM, JiHoon2, HONG, Wei-Li3, RYU, Jong-Sik4, KANG, Moo-Hee2, HAN, Dukki5, NAM, Seung-Il6, KOH, Dong-Chan7, NIESSEN, Frank8, LEE, Dong-Hun9, JANG, Kwangchul6, RAE, James10 and CHEN, Meilian11, (1)College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, 104 CEOAS Admin Bldg, Corvallis, OR 97331, (2)Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, Korea, Republic of (South), (3)Department of Geological Sciences, Stockholm University, Svante Arrhenius väg 8, Stockholm, 11418, Sweden, (4)Department of Earth and Environmental Sciences, Pukyong National University, Busan, 48513, Korea, Republic of (South), (5)Jeju National University, Jeju Special Self-Governing Province, 63243, Korea, Republic of (South), (6)Division of Polar Paleoenvironment, Korea Polar Research Institute, Incheon, 21990, Korea, Republic of (South), (7)Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-no, Yuseong-gu, Daejeon, 34132, Korea, Republic of (South), (8)Geosciences, Alfred Wegener Institute, Columbusstrasse, Building D-1170, Bremerhaven, D-27568, Germany, (9)Hanyang University ERICA Campus, Ansan, 15588, Korea, Republic of (South), (10)School of Earth & Enviro Sciences, University of St Andrews, St Andrews, KY169AL, United Kingdom, (11)Environmental Program, Guangdong Technion-Israel Institute of Technology, Shantou, 515063, China
10:15 AM
DECIPHERING GLACIER ACTIVITY ON BAFFIN ISLAND DURING DEGLACIATION WITH RADIOCARBON ARCHIVES
PENDLETON, Simon L., Woods Hole Oceanographic Institute, Mail Stop #24, 266 Woods Hole Rd, Woods Hole, MA 02543, MILLER, Gifford H., INSTAAR and Dept Geological Sciences, University of Colorado Boulder, 4001 Discovery Drive, Boulder, CO 80309-0450, LIFTON, Nathaniel A., Depts. of Earth, Atmospheric, and Planetary Sciences, and Physics and Astronomy, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907, YOUNG, Nicolás E., Lamont-Doherty Earth Observatory, Columbia University, 219 Comer, 61 Route 9W - PO Box 1000, Palisades, NY 10964-8000, LEHMAN, Scott, Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado – Boulder, Boulder, CO 80309, ANDERSON, Robert, Department of Geological Sciences and INSTAAR, University of Colorado, UCB 450, 1560 30th Street, Boulder, CO 80309 and SOUTHON, John, Earth System Science, University of California, B321 Croul Hall, Irvine, CA 92697
10:30 AM
THE ASSOCIATION OF SUBGLACIAL MELTWATER ACTIVITY WITH ICE-SHEET RETREAT IN MARGUERITE BAY, ANTARCTICA
PROTHRO, Lindsay O., Department of Physical and Environmental Sciences, Texas A&M University Corpus Christi, 6300 Ocean Drive, Corpus Christi, TX 78412, ANDERSON, John B., Department of Earth Science, Rice University, 6100 Main Street MS 126, Houston, TX 77005, MAJEWSKI, Wojciech, Department of Environmental Paleobiology, Polish Academy of Sciences, Warsaw, Poland and YOKOYAMA, Yusuke, Ocean Research Institute/Department of Earth and Planetary Sciences, University of Tokyo, 1-15-1 Minamidai, Nakano-ku, Tokyo, 164-8639, Japan
10:45 AM
QUATERNARY DUST CLIMATE COUPLINGS IN ICEBERG ALLEY – FIRST RESULTS FROM IODP EXPEDITION 382
WEBER, Michael E.1, RAYMO, Maureen E.2, PECK, Victoria L.3, WILLIAMS, Trevor4 and EXPEDITION 382 SCIENTISTS, IODP4, (1)Steinmann-Institute, University of Bonn, Poppelsdorfer Schloss, Bonn, 53115, Germany, (2)Lamont-Doherty Earth Observatory, Columbia U., 61 ROUTE 9W, Palisades, NY 10964, (3)British Antarctic Survey, High Cross, Madingley Rd, Cambridge, CB30ET, United Kingdom, (4)International Ocean Discovery Program, Texas A&M University, College Station, TX 77845
11:00 AM
THE SCOTIA SEA MAGNETIC SUSCEPTIBILITY RECORD: COUPLING OF THE DEEP OCEAN AND ATMOSPHERE?
BRACHFELD, Stefanie A.1, REILLY, Brendan2, TAUXE, Lisa2, WEBER, Michael E.3, RAYMO, Maureen E.4, PECK, Victoria L.5, WILLIAMS, Trevor6, BAILEY, Ian7, HEMMING, Sidney8, O'CONNELL, Suzanne9, RONGE, Thomas10, KENLEE, Bridget11, KAPLAN, Michael R.8, LICHT, Kathy12 and EXPEDITION 382 SCIENTISTS, IODP6, (1)Department of Earth & Environmental Studies, Montclair State University, Montclair, NJ 07043, (2)Scripps Institution of Oceanography, La Jolla, CA 92093-0220, (3)Steinmann-Institute, University of Bonn, Poppelsdorfer Schloss, Bonn, 53115, Germany, (4)Lamont-Doherty Earth Observatory, Columbia U., 61 ROUTE 9W, Palisades, NY 10964, (5)British Antarctic Survey, High Cross, Madingley Rd, Cambridge, CB30ET, United Kingdom, (6)International Ocean Discovery Program, Texas A&M University, College Station, TX 77845, (7)Camborne School of Mines, University of Exeter, Penryn Campus, Cornwall, TR10 9FE, United Kingdom, (8)Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, (9)Wesleyan University, 265 Church St, Middletown, CT 06459, (10)Department for Marine Geology, Alfred Wegener Institute, Bremerhaven, Germany, (11)Department of Earth Sciences, University of California, Riverside, Riverside, CA 92521, (12)Department of Earth Sciences, Indiana University-Purdue University Indianapolis, 723 West Michigan Street, SL 118, Indianapolis, IN 46202
11:15 AM
NEW MAGNETOSTRATIGRAPHIC INSIGHTS FROM ICEBERG ALLEY ON THE RHYTHMS OF ANTARCTIC CLIMATE DURING THE PLIO-PLEISTOCENE (Invited Presentation)
REILLY, Brendan1, TAUXE, Lisa2, BRACHFELD, Stefanie3, HATFIELD, Robert G.4, STONER, Joseph4, RAYMO, Maureen E.5, BAILEY, Ian6, HEMMING, Sidney7, WEBER, Michael E.8, WILLIAMS, Trevor9, GARCIA, Marga10, GUITARD, Michelle11, MARTOS, Yasmina12, PÉREZ, Lara13, ZHENG, Xufeng14, ARMBRECHT, Linda15, CARDILLO, Fabricio16, DU, Zhiheng17, FAUTH, Gerson18, GLUEDER, Anna19, GUTJAHR, Marcus20, HERNANDEZ-ALMEIDA, Ivan21, HOEM, Frida22, HWANG, Ji-Hwan23, IIZUKA, Mutsumi24, KATO, Yuji25, KENLEE, Bridget26, O'CONNELL, Suzanne27, PECK, Victoria L.28, RONGE, Thomas29, SEKI, Osamu30, TRIPATHI, Shubham31 and WARNOCK, Jonathan P.32, (1)Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093-0220, (2)Scripps Institution of Oceanography, La Jolla, CA 92093-0220, (3)Earth and Environmental Studies, Montclair State University, Montclair, NJ 07043, (4)College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, (5)Lamont-Doherty Earth Observatory, Columbia U., 61 ROUTE 9W, Palisades, NY 10964, (6)Camborne School of Mines, University of Exeter, Penryn Campus, Cornwall, TR10 9FE, United Kingdom, (7)Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, (8)Steinmann-Institute, University of Bonn, Poppelsdorfer Schloss, Bonn, 53115, Germany, (9)International Ocean Discovery program, Texas A&M University, College Station, TX 77843, (10)Oceanographic Center of Cadiz, Spanish Institute of Oceanography (IEO), Cádiz, 11006, Spain, (11)College of Marine Science, University of South Florida, St. Petersburg, FL 33701, (12)Department of Astronomy, University of Maryland College Park, College Park, MD 20742, (13)British Antarctic Survey, Cambridge, United Kingdom, (14)Chinese Academy of Sciences, China Sea Institute of Oceanology, 164 West Xingang Road, Guangzhou, 510301, China, (15)Australian Centre for Ancient DNA (ACAD), University of Adelaide, South Australia, Australia, (16)Departamento Oceanografía, Servicio de Hidrografía Naval, Buenos Aires, Argentina, (17)State Key Laboratory of Cryospheric Sciences, Chinese Academy of Sciences, Lanzhou Gansu, China, (18)University of Vale do Rio dos Sinos (UNISINOS), San Leopoldo, Brazil, (19)College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, (20)Helmholtz Centre for Ocean Research Kiel, Christian-Albrechts-University of Kiel, Kiel, Germany, (21)Federal Technical University-Centre, Zurich, Switzerland, (22)Utrecht University, Utrecht, Netherlands, (23)Korea Basic Science Institute, Chungbuk Cheongju, Korea, Republic of (South), (24)Tokyo City University, Tokyo, Japan, (25)Kochi University, Kochi, Japan, (26)Department of Earth Sciences, University of California, Riverside, Riverside, CA 92521, (27)Wesleyan University, 265 Church St, Middletown, CT 06459, (28)British Antarctic Survey, High Cross, Madingley Rd, Cambridge, CB30ET, United Kingdom, (29)Department for Marine Geology, Alfred Wegener Institute, Bremerhaven, Germany, (30)Hokkaido University, Sapporo Hokkaido, Japan, (31)National Centre for Antarctic and Ocean Research (NCAOR), Vasco Da Gama, India, (32)Department of Geoscience, Indiana University of Pennsylvania, Weyandt Hall 137, Indiana, PA 15705
11:30 AM
TRACE ELEMENT DETRITAL PROVENANCE FOR AMUNDSEN SEA OFFSHORE SEDIMENTS ACROSS THE PLIOCENE CLIMATIC OPTIMUM
LIBMAN-ROSHAL, Olga, Earth and Environmental Studies, Montclair State University, Center for Environmental and Life Sciences 220, 1 Normal Ave, Montclair, NJ 07043, PASSCHIER, Sandra, Earth and Environmental Studies, Montclair State University, Center for Environmental and Life Sciences 324, 1 Normal Ave, Montclair, NJ 07043, HILLENBRAND, Claus-Dieter, British Antarctic Survey, High Cross, Madingley Rd, Cambridge, CB3 0ET, United Kingdom, HEMMING, Sidney, Department of Earth and Environmental Sciences, and Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, FREDERICHS, Thomas, Universität Bremen, Fachbereich Geowissenschaften, Postfach 330 440, Bremen, D-28334, Germany, EHRMANN, Werner, Institut für Geophysik und Geologie, Universität Leipzig, Talstraße 35, Leipzig, 04103, Germany and EXPEDITION 379 SCIENTISTS, IODP, College Station, TX 77845
11:45 AM
THWAITES GLACIER, ANTARCTICA, OFFSHORE RESEARCH: INITIAL SEDIMENTARY RECORDS FROM 2019 AND 2020 CRUISES (Invited Presentation)
WELLNER, Julia S.1, CLARK, Rachel1, HILLENBRAND, Claus-Dieter2, MINZONI, Rebecca Totten3, LARTER, Robert4, ANDERSON, John B.5, GRAHAM, Alastair6, HOGAN, Kelly4, NITSCHE, Frank7, SIMKINS, Lauren8, SMITH, James4, FITZGERALD, Victoria T.3, LEHRMANN, Asmara3 and LEPP, Allison9, (1)Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX 77204, (2)British Antarctic Survey, High Cross, Madingley Rd, Cambridge, CB3 0ET, United Kingdom, (3)Department of Geological Sciences, University of Alabama, 201 7th Street, Tuscaloosa, AL 35487, (4)British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, United Kingdom, (5)Department of Earth Science, Rice University, 6100 Main Street MS 126, Houston, TX 77005, (6)University of South Florida, St.Petersburg, FL 33701, (7)Lamont-Doherty Earth Observatory, of Columbia Univ, Palisades, NY 10964, (8)Department of Environmental Sciences, University of Virginia, 291 McCormick Drive, Clark Hall 205, Charlottesville, VA 22911, (9)Department of Environmental Sciences, University of Virginia, Charlottesville, VA 22904
 
12:00 PM
Break
12:05 PM
DEGLACIAL- HOLOCENE ENVIRONMENTAL EVOLUTION FROM A MULTIDISCIPLINARY STUDY ON THE CENTRAL BASIN, WESTERN ROSS SEA
TORRICELLA, Fiorenza1, MELIS, Romana2, CAPOTONDI, Lucilla3, DEL CARLO, Paola4, KUHN, Gerhard5, GENIRAM, Andrea2, GIGLIO, Federico6, YOO, Kyu-Cheul7, KHIM, Boo-Keun8 and COLIZZA, Ester2, (1)Scienze della Terra, Università di Pisa, via santa maria 53, Pisa, Pisa, Italy, (2)Matematica e Geoscienze, Università di Trieste, Trieste, Italy, (3)Istituto di Scienze Marine, Consiglio Nazionale delle Ricerche CNR-ISMAR, bologna, Italy, (4)Istituto Nazionale di Geofisica e Vulcanologia, INGV, Pisa, Italy, (5)Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, 27568, Germany, (6)Istituto di Scienze Polari, Consiglio Nazionale delle Ricerche CNR-ISP, bologna, Italy, (7)Korea Polar Research Institute, KOPRI, Incheon, Korea, Republic of (South), (8)Oceanography, Pusan National University, Busan, Korea, Republic of (South)
12:15 PM
SUMMER SEA-ICE VARIABILITY IN THE EASTERN WEDDELL SEA DURING THE LAST GLACIAL STAGE AS RECORDED IN SNOW PETREL STOMACH OILS (‘MUMIYO’)
MCCLYMONT, Erin L.1, BENTLEY, Michael J.1, HODGSON, Dominic2, PHILLIPS, Richard2, SPENCER-JONES, Charlotte3, BERG, Sonja4, CROUDACE, Ian5, GRÖCKE, Darren R.6, KUHN, Gerhard7 and SIME, Louise2, (1)Department of Geography, Durham University, Lower Mountjoy, Durham, DH1 3LE, United Kingdom, (2)British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, United Kingdom, (3)School of Environment, Earth and Ecosystem Sciences, Open University, Milton Keynes, MK7 6AA, United Kingdom; Department of Geography, Durham University, Lower Mountjoy, Durham, DH1 3LE, United Kingdom, (4)Institute of Geology and Mineralogy, University of Cologne, Cologne, D-50674, Germany, (5)Ocean and Earth Science, National Oceanography Centre Southampton at the University of Southampton, Southampton, SO17 1BJ, United Kingdom, (6)Department of Earth Science, Durham University, Durham, DH1 3LE, United Kingdom; Department of Earth Sciences, University of Durham, Science Labs, Durham, DH1 3LE, United Kingdom, (7)Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, 27568, Germany
12:25 PM
CONNECTING THE PLIO-PLEISTOCENE CLIMATE RECORDS OF THE PACIFIC AND ATLANTIC SIDES OF THE ANTARCTIC PENINSULA BY CYCLE TO CYCLE CORRELATION
SANTOS, Brooke1, HEMMING, Sidney2, WILLIAMS, Trevor3, O'CONNELL, Suzanne4, REILLY, Brendan5, KAPLAN, Michael R.2 and EXPEDITION 382 SCIENTISTS, IODP3, (1)University of California Santa Cruz, Santa Cruz, CA 95064, (2)Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, (3)International Ocean Discovery Program, Texas A&M University, College Station, TX 77845, (4)Wesleyan University, 265 Church St, Middletown, CT 06459, (5)Scripps Institution of Oceanography, La Jolla, CA 92093-0220
12:35 PM
GEOCHRONOLOGY EVIDENCE FOR THE PROVENANCE OF DROPSTONES IN THE SCOTIA SEA
HEMMING, Sidney R., Columbia University, Lamont-Doherty Earth Observatory, PO Box 1000, 61 Route 9W, Palisades, NY 10964, SANDOZ, David, Hamilton College, Clinton, NY 13323, WATKINS, Connor, Department of Earth Sciences, Indiana University Purdue University of Indianapolis, Indianapolis, IN 46202, LICHT, Kathy, Department of Earth Sciences, Indiana University-Purdue University Indianapolis, 723 West Michigan Street, SL 118, Indianapolis, IN 46202, WILLIAMS, Trevor, International Ocean Discovery program, Texas A&M University, College Station, TX 77843, SIDDOWAY, Christine S., Geology Department, Colorado College, 14 E. Cache La Poudre St, Colorado Springs, CO 80903, REINERS, P.W., Department of Geosciences, University of Arizona, Tucson, AZ 85721, THOMSON, Stuart N., Department of Geosciences, University of Arizona, 1040 E. 4th St., Tucson, AZ 85721, COX, Stephen E., Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, VAN DE FLIERDT, Tina, Department of Earth Science and Engineering, Imperial College, London, SW7 2AZ, United Kingdom, BAILEY, Ian, Camborne School of Mines, University of Exeter, Penryn Campus, Cornwall, TR10 9FE, United Kingdom, BRACHFELD, Stefanie A., Department of Earth & Environmental Studies, Montclair State University, Montclair, NJ 07043, O'CONNELL, Suzanne, Wesleyan University, 265 Church St, Middletown, CT 06459, WEBER, Michael E., Steinmann-Institute, University of Bonn, Poppelsdorfer Schloss, Bonn, 53115, Germany, RAYMO, Maureen E., Lamont-Doherty Earth Observatory, Columbia U., 61 ROUTE 9W, Palisades, NY 10964, PECK, Victoria L., British Antarctic Survey, High Cross, Madingley Rd, Cambridge, CB30ET, United Kingdom and EXPEDITION 382 SCIENTISTS, IODP, International Ocean Discovery Program, Texas A&M University, College Station, TX 77845
 
12:45 PM
Discussion
1:00 PM
GLACIALLY-CONTROLLED VARIATIONS IN THE BIOLOGICAL PUMP OF THE ROSS SEA DURING THE MID-TO-LATE PLIOCENE
NIRENBERG, Jared E.1, ROMANS, Brian W.2, PATTERSON, Molly O.3, KULHANEK, Denise K.4, DE SANTIS, Laura5, MCKAY, Robert M.6, ASH, Jeanine7 and EXPEDITION 374 SCIENTISTS, IODP4, (1)Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI 02912, (2)Geosciences, Virginia Tech, 4044 Derring Hall, Virginia Tech, Blacksburg, VA 24061, (3)Geological Sciences and Environmental Studies, Binghamton University, 4400 Vestal Parkway East, Binghamton, NY 13902, (4)International Ocean Discovery Program, Texas A&M University, College Station, TX 77845, (5)Geofisica Della Litosfera, Instituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Trieste, 34016, Italy, (6)Antarctic Research Center, Victoria University of Wellington, Wellington, 6012, New Zealand, (7)Earth, Environmental and Planetary Sciences, Rice University, Houston, TX 77005
1:10 PM
THE INFLUENCE OF A DYNAMIC ANTARCTIC ICE SHEET ON SILICATE WEATHERING AND BIOGENIC OPAL PRODUCTION IN THE ROSS SEA, ANTARCTICA DURING THE MIOCENE CLIMATIC OPTIMUM
CHRISTOPOULOU, Marialena1, DODD, Justin P.1, BROWNE, Imogen2, SHEVENELL, Amelia2, MCKAY, Robert M.3, DE SANTIS, Laura4, KULHANEK, Denise K.5 and EXPEDITION 374 SCIENTISTS, IODP5, (1)Geology and Environmental Geosciences, Northern Illinois University, Dekalb, IL 60115, (2)College of Marine Science, University of South Florida, St. Petersburg, FL 33701, (3)Antarctic Research Center, Victoria University of Wellington, Wellington, 6012, New Zealand, (4)Geophysics Division, Instituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Sgonico, Italy, (5)International Ocean Discovery Program, Texas A&M University, College Station, TX 77845
1:20 PM
IDENTIFICATION OF ICE-RAFTED DEBRIS IN THE WEDDELL SEA TO CHARACTERIZE GLACIATION AT THE EOCENE-OLIGOCENE TRANSITION
HOROWITZ, Josie E. and PASSCHIER, Sandra, Earth and Environmental Studies, Montclair State University, 1 Normal Avenue, Montclair, NJ 07043
1:30 PM
IMPLICATIONS OF GEOCHEMICAL ANALYSIS OF ODP SITE 696 ON GLACIATION OF WEST ANTARCTICA DURING THE EOCENE-OLIGOCENE TRANSITION
HOJNACKI, Victoria, JOSEPH, Ridley and PASSCHIER, Sandra, Earth and Environmental Studies, Montclair State University, Center for Environmental and Life Sciences 324, 1 Normal Ave, Montclair, NJ 07043
1:40 PM
THERMOCHRONOLOGIC HISTORY OF SUBGLACIAL GEOLOGY OF WILKES SUBGLACIAL BASIN SECTOR OF EASTERN ANTARCTICA THROUGH MULTI-DATING OF DROPSTONES
KODAMA, Samuel, Columbia University, Department of Earth and Environmental Science, 70 Morningside Drive, New York, NY 10027, COX, Stephen E., Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, HEMMING, Sidney, Department of Earth and Environmental Sciences, and Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, THOMSON, Stuart N., Department of Geosciences, University of Arizona, 1040 E. 4th St., Tucson, AZ 85721, REINERS, P.W., Department of Geosciences, University of Arizona, Tucson, AZ 85721 and WILLIAMS, Trevor, International Ocean Discovery Program, Texas A&M University, College Station, TX 77845
1:50 PM
APPLICATIONS OF LOW-TEMPERATURE THERMOCHRONOLOGY TO GLACIAL EROSION AND BEDROCK EXHUMATION IN THE CENTRAL TRANSANTARCTIC MOUNTAINS
NORDIN, Bailey1, COX, Stephen E.2, HEMMING, Sidney2, THOMSON, Stuart N.3, REINERS, Peter W.4 and LICHT, Kathy5, (1)Department of Earth and Environmental Sciences, Columbia University, New York, NY 10027, (2)Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, (3)Department of Geosciences, University of Arizona, 1040 E. 4th St., Tucson, AZ 85721, (4)Department of Geosciences, University of Arizona, Tucson, AZ 85721, (5)Department of Earth Sciences, Indiana University-Purdue University Indianapolis, 723 West Michigan Street, SL 118, Indianapolis, IN 46202
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