Data report; Strontium isotope analyses of pore fluids from the CRISP-A transect drilled during Expeditions 334 and 344

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doi: 10.2204/iodp.proc.344.201.2015
Author(s): Ross, Nathan; Torres, Marta E.; Haley, Brian A.; Solomon, Evan A.; Kastner, Miriam
Integrated Ocean Drilling Program, Expedition 344 Scientists, College Station, TX
Author Affiliation(s): Primary:
Oregon State University, Corvallis, OR, United States
Other:
Japan Agency for Marine-Earth Science and Technology, Japan
Texas A&M University, United States
Lamont-Doherty Earth Observatory, United States
University of New England, Australia
University of Washington, United States
Indiana State University, United States
Université de Franche-Comté, France
Korea Institute of Geoscience and Mineral Resources, South Korea
University of Vigo, Spain
University of Tokyo, Japan
Kochi University, Japan
Helmholtz Centre for Ocean Research Kiel, Germany
Universidade de Sao Paulo, Brazil
Scripps Institution of Oceanography, United States
University of Graz, Austria
Nanjing University, China
Naval Research Laboratory, United States
Ohio State University, United States
Universidade Federal do Rio de Janeiro, Brazil
Université de Lausanne, Switzerland
University of Florida, United States
University of Southampton, United Kingdom
Kumamoto University, Japan
State Oceanic Administration, China
University of California, Santa Cruz, United States
Volume Title: Proceedings of the Integrated Ocean Drilling Program; Costa Rica seismogenesis project, Program A, Stage 2 (CRISP-A2); Expedition 344 of the riserless drilling platform Balboa, Panama, to Puntarenas, Costa Rica; Sites U1380, U1381, and U1412-U1414, 23 October-11 December 2012
Volume Author(s): Harris, Robert N.; Sakaguchi, Arito; Petronotis, Katerina; Malinverno, Alberto; Baxter, Alan T.; Berg, Richard; Burkett, Ashley; Charpentier, Delphine; Choi, Jiyoung; Ferreiro, Paula Diz; Hamahashi, Mari; Hashimoto, Yoshitaka; Heydolph, Ken; Jovane, Luigi; Kastner, Miriam; Kurz, Walter; Kutterolf, Steffen O.; Li Yongxiang; Martin, Kylara M.; Millan, Cristina; Nascimento, Débora B.; Saito, Saneatsu; Sandoval Gutierrez, Maria I.; Screaton, Elizabeth J.; Smith-Duque, Christopher E.; Solomon, Evan A.; Straub, Susanne M.; Tanikawa, Wataru; Torres, Marta E.; Uchimura, Hitomi; Vannucchi, Paola; Yamamoto, Yuzuru; Yan Quanshu; Zhao, Xixi
Source: Proceedings of the Integrated Ocean Drilling Program; Costa Rica seismogenesis project, Program A, Stage 2 (CRISP-A2); Expedition 344 of the riserless drilling platform Balboa, Panama, to Puntarenas, Costa Rica; Sites U1380, U1381, and U1412-U1414, 23 October-11 December 2012, Robert N. Harris, Arito Sakaguchi, Katerina Petronotis, Alberto Malinverno, Alan T. Baxter, Richard Berg, Ashley Burkett, Delphine Charpentier, Jiyoung Choi, Paula Diz Ferreiro, Mari Hamahashi, Yoshitaka Hashimoto, Ken Heydolph, Luigi Jovane, Miriam Kastner, Walter Kurz, Steffen O. Kutterolf, Li Yongxiang, Kylara M. Martin, Cristina Millan, Débora B. Nascimento, Saneatsu Saito, Maria I. Sandoval Gutierrez, Elizabeth J. Screaton, Christopher E. Smith-Duque, Evan A. Solomon, Susanne M. Straub, Wataru Tanikawa, Marta E. Torres, Hitomi Uchimura, Paola Vannucchi, Yuzuru Yamamoto, Yan Quanshu and Xixi Zhao; Integrated Ocean Drilling Program, Expedition 344 Scientists, College Station, TX. Proceedings of the International Ocean Discovery Program, Vol.344, 13p. Publisher: International Ocean Discovery Program, Washington, DC, United States. ISSN: 2377-3189 CODEN: IDSDA6
Note: In English. 28 refs.; illus., incl. 1 table, sketch map
Summary: We report on the Sr isotopic composition of pore fluids recovered during Integrated Ocean Drilling Program Costa Rica Seismogenesis Project Expeditions 334 and 344. Pore fluid samples were acidified and loaded directly onto columns containing EICHROM Sr-Spec resin, followed by analyses using a NU multicollector inductively coupled plasma-mass spectrometer at the Keck Collaboratory, Oregon State University. Sites drilled on the upper plate exhibited a decrease in the 87Sr/86Sr ratio to values as low as 0.70762 in the upper 200-300 m of the sediment column, suggesting the role of ash alteration. The unconformity between the slope sediment sequence and underlying framework rock, sampled at Sites U1378-U1380, is characterized by intense fracturing. The fluids sampled within the unconformity at these sites have 87Sr/86Sr ratios ranging from 0.70834 to 0.70844. Fluids sampled from the incoming plate sediment show evidence of ash alteration and carbonate diagenesis, but the deepest sediment here may also be modified by diffusion of fluids from the underlying oceanic crust. Intense carbonate recrystallization in the lower 66 m of Site U1414 results in Sr concentrations that are almost an order of magnitude higher than those measured at the base of Site U1381. The deepest pore fluid sample measured at both Sites U1381 and U1414 has a 87Sr/86Sr ratio of 0.7086. The strontium systematics in this margin, used in the context of other ongoing studies, may be used to unravel processes at this margin, such as carbonate diagenesis, ash alteration, fluid migration, and diffusive exchange with the underlying oceanic crust.
Year of Publication: 2015
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 02 Geochemistry; 07 Marine Geology and Oceanography; Alkaline earth metals; Chloride ion; Chlorine; Cores; Costa Rica Seismogenesis Project; Crust; East Pacific; Expedition 334; Expedition 344; Geochemistry; Halogens; Hydrochemistry; IODP Site U1378; IODP Site U1379; IODP Site U1380; IODP Site U1381; IODP Site U1412; IODP Site U1413; IODP Site U1414; Integrated Ocean Drilling Program; Isotope ratios; Isotopes; Marine sediments; Metals; North Pacific; Northeast Pacific; Oceanic crust; Pacific Ocean; Plate convergence; Pore water; Sediments; Sr-87/Sr-86; Stable isotopes; Strontium; Sulfates
Coordinates: N083532 N083532 W0840438 W0840438
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Record ID: 2015055305
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