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Leg 185 Preliminary Report OCEAN DRILLING PROGRAM LEG 185 PRELIMINARY REPORT IZU-MARIANA MARGIN Dr. Terry Plank Dr. John Ludden Co-Chief Scientist Co-Chief Scientist Department of Geology Centre de Recherches 120 Lindely Hall Petrographiques et University of Kansas Geochimiques (CNRS) Lawrence, KS 66045 Nancy, 54501 U.S.A. France Dr. Carlota Escutia Staff Scientist Ocean Drilling Program Texas A&M University 1000 Discovery Drive College Station, TX 77845-9547 U.S.A. __________________ _____________________ Dr. Jack Baldauf Dr. Carlota Escutia Deputy Director of Leg Project Manager Science Operations Science Services ODP/TAMU ODP/TAMU September 1999 This informal report was prepared from the shipboard files by the scientists who participated in the cruise. The report was assembled under time constraints and is not considered to be a formal publication that incorporates final works or conclusions of the participating scientists. The material contained herein is privileged proprietary information and cannot be used for publication or quotation. Preliminary Report No. 85 First Printing 1999 Distribution Electronic copies of this publication may be obtained from the ODP Publications Homepage on the World Wide Web at http://www-odp.tamu.edu/publications. D I S C L A I M E R This publication was prepared by the Ocean Drilling Program, Texas A&M University, as an account of work performed under the international Ocean Drilling Program, which is managed by Joint Oceanographic Institutions, Inc., under contract with the National Science Foundation. Funding for the program is provided by the following agencies: Australia/Canada/Chinese Taipei/Korea Consortium for Ocean Drilling Deutsche Forschungsgemeinschaft (Federal Republic of Germany) Institut Français de Recherche pour l’Exploitation de la Mer (France) Ocean Research Institute of the University of Tokyo (Japan) National Science Foundation (United States) Natural Environment Research Council (United Kingdom) European Science Foundation Consortium for the Ocean Drilling Program (Belgium, Denmark, Finland, Iceland, Italy, The Netherlands, Norway, Portugal, Spain, Sweden, and Switzerland) Marine High-Technology Bureau of the State Science and Technology Commission of the People’s Republic of China Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the National Science Foundation, the participating agencies, Joint Oceanographic Institutions, Inc., Texas A&M University, or Texas A&M Research Foundation. Leg 185 Preliminary Report 3 The following scientists were aboard the JOIDES Resolution for Leg 185 of the Ocean Drilling Program: Terry Plank Jeffrey C. Alt Co-Chief Scientist Igneous Petrologist Department of Geology Department of Geological Sciences University of Kansas University of Michigan 120 Lindley Hall 2534 C.C. Little Building Lawrence, KS 66045 425 E. University U.S.A. Ann Arbor, MI 48109-1063 Internet: [email protected] U.S.A. Work: (785) 864-2725 Internet: [email protected] Fax: (785) 864-5276 Work: (313) 764-8380 Fax: (313) 763-4690 John N. Ludden Co-Chief Scientist Robin N. Armstrong CRPG-CNRS Inorganic Geochemist 15 rue Notre-Dame des Pauvres, B.P.20 Southampton Oceanography Centre Vandoeuvre-les-Nancy, 54501 University of Southampton France Empress Dock, European Way Internet: [email protected] Southampton SO14 3ZH Work: (33) 3-83-594213 United Kingdom Fax: (33) 3-83511798 Internet: [email protected] Work: (44) 1703-59-6133 Carlota Escutia Fax: (44) 1703-593-052 Staff Scientist Ocean Drilling Program Samantha Barr Texas A&M University Igneous Petrologist 1000 Discovery Drive Department of Geology College Station, TX 77845-9547 University of Leicester U.S.A. Universitiy Road Internet: [email protected] Leicester LE1 7RH Work: (409) 845-0506 United Kingdom Fax: (409) 845-0876 Internet: [email protected] Work: (44) 116-252-3608 Lewis Abrams Fax: (44) 116-252-3918 Physical Properties Specialist Department of Earth Sciences Annachiara Bartolini University of North Carolina Paleontologist (radiolarians) 601 South College Road Institut de Geologieet Paleontologie Wilmington, NC 28403-3297 Universite de Lausanne U.S.A. BFSH-2 UNIL Internet: [email protected] Lausanne, VD 1015 Work: (910) 962-7422 Switzerland Fax: (910) 962-7077 Internet: [email protected] Work: (41)21-692-4343 Fax: (41)21-692-4305 4 Leg 185 Preliminary Report Graeme Cairns Tetsuro Hirono LDEO Logging Trainee Physical Properties Specialist Laboratoire de Mesures en Forage Department of Earth and Planetary Sciences ODP/Naturalia et Biologia (NEB) Tokyo Institute of Technology BP 72 Okayama 2-12-1 13545 Aix-en-Provence Cedex 4 13545 Meguro-ku France Tokyo, 152-8551 Internet c/o: [email protected] Japan Work: (33) 4-42-97-11-22 Internet: [email protected] Fax: (33) 4-42-97-11-21 Work: (81) 11-816-5099 Fax: (81) 35-734-3543 Martin R. Fisk Microbiologist/Igneous Petrologist José Honnorez College of Oceanic and Atmospheric Metamorphic Petrologist Sciences Institut de Géologie Oregon State University Université Louis Pasteur 104 Ocean Administration Building 1 rue Blessig Corvallis, OR 97331-5503 Strasbourg, Cedex 67084 U.S.A. France Internet: [email protected] Internet: [email protected] Work: (541) 737-5208 Work: (33) 3-88-35-85-38 Fax: (541) 737-2064 Fax: (33) 3-88-36-72-35 Gilles Guèrin Katherine A. Kelley LDEO Logging Scientist Igneous Petrologist Lamont-Doherty Earth Observatory Department of Geology Columbia University University of Kansas Palisades, NY 10964 120 Lindley Hall U.S.A. Lawrence, KS 66045 Work: (914) 365-8671 U.S.A. Fax: (914) 365-3182 Internet: [email protected] Internet: [email protected] Work: (785) 864-7714 Fax: (785) 864-5276 Shelley A. Haveman Microbiologist Roger L. Larson Institute for Cell and Molecular Biology, JOIDES Logging Scientist Microbiology Graduate School of Oceanography Göteborgs Universitet University of Rhode Island Box 462 Narragansett, RI 02882-1197 Göteborg 405 30 U.S.A. Sweden Internet: [email protected] Internet: [email protected] Work: (401) 874-6165 Work: (46) 31-773-2586 Fax: (401) 874-6811 Fax: (46) 31-773-2599 Leg 185 Preliminary Report 5 Francesca M. Lozar Olivier Rouxel Paleontologist (nannofossils) Igneous Petrologist Centro di Studi Sulla Geodinamica delle Centre de Recherches Catene Collisionali Pétrographiques et Géochimiques Consiglio Nazionale delle Ricerche 15 rue Notre-Dame des Pauvres, B.P. 20 via Accademia delle Scienze 5 Vandoeuvre-lés-Nancy, Cedex 54501 Torino, 10123 France Italy Internet: [email protected] Internet: [email protected] Work: (33) 03-83-59-42-23 Work: (39) 11-562-8928 Fax: (33) 03-83-51-17-98 Fax: (39) 11-541-755 Angelika Schmidt Richard W. Murray Igneous Petrologist Inorganic Geochemist GEOMAR Department of Earth Sciences Department of Volcanology and Petrology Boston University Christian-Albrechts-Universität zu Kiel 685 Commonwealth Avenue Wischhofstrasse 1-3 Boston, MA 02215 Kiel 24148 U.S.A. Federal Republic of Germany Internet: [email protected] Internet: [email protected] Work: (617) 353-6532 Work: (49) 431-600-2644 Fax: (617) 353-3290 Fax: (49) 431-600-2949 Thomas K. Pletsch David C. Smith Sedimentologist Microbiologist Geologisch-Paläontologisches Institut Graduate School of Oceanography Christian-Albrechts-Universität zu Kiel University of Rhode Island Olshausenstraþe 40-60 South Ferry Road Kiel 24118 Narragansett, RI 02881-1197 Federal Republic of Germany U.S.A. Internet: [email protected] Internet: [email protected] Work: (49) 431-880-2938 Work: (401) 874-6172 Fax: (49) 431-880-4376 Fax: (401) 874-6240 Robert A. Pockalny Arthur J. Spivack JOIDES Logging Scientist Inorganic Geochemist Graduate School of Oceanography Department of Earth Sciences University of Rhode Island University of North Carolina Narragansett, RI 02882-1197 601 South College Road U.S.A. Wilmington, NC 28403-3297 Internet: [email protected] U.S.A. Work: (401) 874-6926 Internet: [email protected] Fax: (401) 874-6811 Work: (910) 256-3721 Fax: (910) 256-8856 6 Leg 185 Preliminary Report Hubert Staudigel Igneous Petrologist Scripps Institution of Oceanography University of California, San Diego La Jolla, CA 92093-0225 U.S.A. Internet: [email protected] Work: (619) 534-8764 Fax: (619) 534-8090 Maureen B. Steiner Paleomagnetist Department of Geology and Geophysics University of Wyoming P.O. Box 3006, University Station Laramie, WY 82071 U.S.A. Internet: [email protected] Work: (307)766-6584 Fax: (307)766-6679 Robert B. Valentine Sedimentologist Department of Earth and Planetary Sciences Washington University One Brookings Drive Campus Box 1169 St. Louis, MO 63130 U.S.A. Internet: [email protected] Work: (314) 935-7292 Fax: (314) 935-5610 Leg 185 Preliminary Report 7 SCIENTIFIC REPORT ABSTRACT Subduction zones are the primary regions on Earth today where crust recycling takes place, and through geological time they have been the sites of continent formation. Many of the key elements (e.g., Th, rare earth elements, Ba, and Be) that are important in understanding crustal growth are sequestered in the sedimentary column and in the uppermost oxidized portions of the volcanic section of oceanic basement (K, B, U, CO2, H2O). The principal objective of Leg 185 was to core two sites in Mesozoic crust in the west Pacific, which is being subducted into the Mariana and Izu-Bonin subduction systems, in order to determine the inputs into the “west Pacific subduction factory.” Hole 801C was first drilled in the oldest (~165 Ma) crust in the Pacific Ocean during Ocean Drilling Program (ODP) Leg 129. During Leg 185 the hole was deepened to nearly 500 meters below seafloor (mbsf), and at Site 1149, located on magnetic Anomaly M11 (~132 Ma) 100 km east of the Izu-Bonin Trench, the entire sedimentary sequence (410 m) and an additional 133 m of highly altered volcanic basement was drilled. Using the recovered core and the logging results, it is possible to reconstruct the volcanic section for Hole 801C.
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