87Sr/86Sr in pore fluids from NanTroSEIZE Expeditions 322 and 333

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doi: 10.2204/iodp.proc.322.207.2013
Author(s): Joseph, Craig; Torres, Marta E.; Haley, Brian A.
Integrated Ocean Drilling Program, Expedition 322 Scientists, College Station, TX
Author Affiliation(s): Primary:
Oregon State University, College of Earth, Ocean and Atmospheric Science, Corvallis, OR, United States
Other:
Japan Agency for Marine-Earth Science and Technology, Japan
Tohoku University, Japan
Université de Toulouse, France
Rice University, United States
National Centre for Antarctic and Ocean Research, India
Osaka University, Japan
University of Bremen, Germany
Pennsylvania State University, United States
University of Kiel, Germany
Joseph Fourier University, France
University of Melbourne, Australia
Chiba University, Japan
Geological Survey of Japan, Japan
University of Tokyo, Japan
University College London, United Kingdom
Boston University, United States
Lamont-Doherty Earth Observatory, United States
New Mexico Institute of Mining and Technology, United States
Oregon State University, United States
University of Leicester, United Kingdom
China University of Geosciences, China
Doshisha University, Japan
University of California-Santa Cruz, United States
Volume Title: Proceedings of the Integrated Ocean Drilling Program; NanTroSEIZE Stage 2; subduction inputs; Expedition 322 of the riser drilling platform, Yokkaichi, Japan, to Shingu, Japan, Sites C0011 and C0012, 1 September-10 October 2009
Volume Author(s): Underwood, Michael B.; Saito, Saneatsu; Kubo, Yu'suke; Sanada, Yoshinori; Chiyonobu, Shun; Destrigneville, Christine; Dugan, Brandon; Govil, Pawan; Hamada, Yohei; Heuer, Verena; Hüpers, Andre; Ikari, Matt; Kitamura, Yujin; Kutterolf, Steffen; Labanieh, Shasa; Moreau, John; Naruse, Hajime; Oda, Hirokuni; Park, Jin-Oh; Pickering, Kevin T.; Scudder, Rachel; Slagle, Angela; Spinelli, Glenn; Torres, Marta E.; Tudge, Joanne; Wu Huaichun; Yamamoto, Tomohiro; Yamamoto, Yuzuru; Zhao, Xixi
Source: Proceedings of the Integrated Ocean Drilling Program; NanTroSEIZE Stage 2; subduction inputs; Expedition 322 of the riser drilling platform, Yokkaichi, Japan, to Shingu, Japan, Sites C0011 and C0012, 1 September-10 October 2009, Michael B. Underwood, Saneatsu Saito, Yu'suke Kubo, Yoshinori Sanada, Shun Chiyonobu, Christine Destrigneville, Brandon Dugan, Pawan Govil, Yohei Hamada, Verena Heuer, Andre Hüpers, Matt Ikari, Yujin Kitamura, Steffen Kutterolf, Shasa Labanieh, John Moreau, Hajime Naruse, Hirokuni Oda, Jin-Oh Park, Kevin T. Pickering, Rachel Scudder, Angela Slagle, Glenn Spinelli, Marta E. Torres, Joanne Tudge, Wu Huaichun, Tomohiro Yamamoto, Yuzuru Yamamoto and Xixi Zhao; Integrated Ocean Drilling Program, Expedition 322 Scientists, College Station, TX. Proceedings of the Integrated Ocean Drilling Program (Online), Vol.322, 7p. Publisher: IODP Management International, Washington, DC, United States. ISSN: 1930-1014
Note: In English. 9 refs.; illus., incl. 1 table, sketch map
Summary: We report on the Sr isotopic composition of pore fluids recovered during Integrated Ocean Drilling Program Expeditions 322 and 333 at Sites C0011 and C0012, drilled on the Philippine Sea plate before subduction along the Nankai Trough. Acidified pore fluids were directly loaded into EICHROM Sr-specific columns, and isotopic analysis was performed using a Nu multicollector inductively coupled mass spectrometer. At both Sites C0011 and C0012, 87Sr/86Sr decreases with depth from the seawater value to ∼0.7069 at a depth that corresponds to the bottom of lithologic Unit I, which consists of ash-bearing hemipelagic sediments. This decrease is consistent with the reported observation of increasing ash alteration with depth within Subunit IB. Pore fluids recovered from lithologic Units II-IV show a relatively constant 87Sr/86Sr ratio, which ranges between 0.7069 and 0.7065 at both sites. The volcaniclastic turbidites of Unit V and the red clay (Unit IV) directly overlying the basement were only recovered at Site C0012. The 87Sr/86Sr ratio below Unit IV shows a marked decrease, reaching the lowest value of 0.704367 in the deepest pore fluids recovered (529 m below seafloor), suggesting a diffusional communication with an 87Sr-depleted fluid in the igneous upper crust.
Year of Publication: 2013
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 02 Geochemistry; Alkaline earth metals; Boreholes; Cores; Expedition 322; Expedition 333; Geochemistry; Hydrochemistry; IODP Site C0011; IODP Site C0012; Integrated Ocean Drilling Program; Isotope ratios; Isotopes; Marine sediments; Metals; NanTroSEIZE; North Pacific; Northwest Pacific; Pacific Ocean; Philippine Sea Plate; Plate tectonics; Pore water; Sedimentary rocks; Sediments; Shikoku Basin; Sr-87/Sr-86; Stable isotopes; Strontium; West Pacific
Coordinates: N324944 N324945 E1365256 E1365254
N324453 N324453 E1365501 E1365501
Record ID: 2013047884
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