The vertical chloride ion profile at the IODP Site C0002, Kumano Basin, off coast of Japan

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doi: 10.1016/j.tecto.2016.11.029
Author(s): Toki, Tomohiro; Kinoshita, Masataka; Morita, Sumito; Masuda, Harue; Rashid, Harunur; Yoshinishi, Haruka; Nakano, Takanori; Noguchi, Takashi
Author Affiliation(s): Primary:
University of the Ryukyus, Department of Chemistry, Biology and Marine Science, Okinawa, Japan
Yokohama Institute, Japan
Japanese Geological Survey, Japan
Osaka City University, Japan
Memorial University of Newfoundland, Canada
Research Institute for Humanity and Nature, Japan
Kyoto University, Japan
Volume Title: Evolution of fore-arc and back-arc sedimentary basins with focus on the Japan subduction system and its analogues
Volume Author(s): Sato, Hiroshi, editor; Ishiyama, Tatsuya; Matenco, Liviu; Henri, Fadi
Source: Evolution of fore-arc and back-arc sedimentary basins with focus on the Japan subduction system and its analogues, edited by Hiroshi Sato, Tatsuya Ishiyama, Liviu Matenco and Fadi Henri. Tectonophysics, Vol.710-711, p.88-96. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0040-1951 CODEN: TCTOAM
Note: In English. Includes appendices. 40 refs.; illus., incl. 1 table, sketch map
Summary: The vertical profiles of chloride ion (Cl-) concentration and oxygen and hydrogen isotopic ratios in pore fluids of basin-fill sediments in the southern Kumano Basin were examined. A model has been proposed to explain those profiles in conjunction with published data by invoking diffusion and advection of freshwater from methane hydrate dissolution. The model requires a low initial Cl- concentration in the old accretionary prism below the basin before the basin began to fill with sediments. It also requires little or no methane hydrate formation in the old accretionary prism. Given these requirements, an upward fluid advection rate of 1 × 10-12 m/s has been estimated which is very low compared to other accretionary prisms. Our data suggests that the tectonic compaction of the basin-filling sediments and fault activity under the basin sediments have not been that active recently in the Kumano Basin.
Year of Publication: 2017
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 02 Geochemistry; Accretionary wedges; Advection; Aliphatic hydrocarbons; Alkanes; Basin analysis; Basins; Chemical composition; Chlorine; Compaction; D/H; Diffusion; Fluid phase; Fresh water; Gas hydrates; Geophysical methods; Geophysical surveys; Halogens; Hydrocarbons; Hydrogen; IODP Site C0002; Integrated Ocean Drilling Program; Isotope ratios; Isotopes; Kumano Basin; Marine sediments; Methane; NanTroSEIZE; North Pacific; Northwest Pacific; O-18/O-16; Organic compounds; Oxygen; Pacific Ocean; Pore water; Sediments; Seismic methods; Stable isotopes; Surveys; West Pacific
Coordinates: N331800 N331801 E1363801 E1363800
Record ID: 2017099768
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands