Tomaru, Hitoshi and Fehn, Udo (2012): Distribution of iodine concentration and (super 129) I in interstitial fluid in the Nankai Trough accretionary prism collected during IODP Expeditions 315 and 316

Leg/Site/Hole:
IODP 314 C0001
IODP 315 C0001
IODP 314 C0002
IODP 315 C0002
IODP 326 C0002
IODP 332 C0002
IODP 338 C0002
Identifier:
2012-016472
georefid

10.2204/iodp.proc.314315316.220.2012
doi

Creator:
Tomaru, Hitoshi
University of Tokyo, Department of Earth and Planetary Science, Tokyo, Japan
author

Fehn, Udo
University of Wisconsin-Madison, United States
author

Identification:
Distribution of iodine concentration and (super 129) I in interstitial fluid in the Nankai Trough accretionary prism collected during IODP Expeditions 315 and 316
2012
In: Kinoshita, Masataka, Tobin, Harold, Ashi, J., Kimura, G., Lallemant, S., Screaton, E. J., Curewitz, D., Masago, H., Moe, K. T., Thu, Moe Kyaw, Gaillot, Philippe, Bourlange, Sylvain, Chang, Chandong, Conin, Marianne, Gulick, Sean, Jurado Rodriguez, Maria Jose Jurado, Martin, Kylara M., McNeill, Lisa, Miyakawa, Ayumu, Moore, J. Casey, Nakamura, Yasuyuki, Saito, Saneatsu, Sawyer, Dale S., Tudge, Joanne, Yamada, Yasuhiro, Masago, Hideki, Behrmann, Jan H., Boeckel, Babette, Byrne, Timothy, Calves, Gerome, Famin, Vincent, Guo Junhua, Hashimoto, Yoshitaka, Hayashi, Hiroki, Henry, Pierre, Hirono, Tetsuro, Hulme, Samuel M., Kaksonen, Anna Henriikka, Kanagawa, Kyuichi, Kanamatsu, Toshiya, Kopf, Achim, Lewis, Jonathan C., Likos, William John, Pares, Josep Maria, Saito, Hiroyuki, Schmidt-Schierhorn, Friederike, Tomaru, Hitoshi, Underwood, Michael, Zhu, Wen-Lu, Chester, Frederick, Fabbri, Olivier, Fergusson, Chris, Girault, France E., Goldsby, David, Harris, Robert, Inagaki, Fumio, Jiang, Tao, Kitamura, Yujin, Knuth, Matt, Li Chunfeng, Liljedahl, Lillemor Claesson, Louis, Laurent, Milliken, Kitty, Nicholson, Uisdean, Riedinger, Natascha, Sakaguchi, Arito, Solomon, Evan, Strasser, Michael, Xin Su, Tsutsumi, Akito, Ujiie, Kochtaro, Yamaguchi, Asuka, Zhao, Xixi, Proceedings of the Integrated Ocean Drilling Program; Nantroseize Stage 1; investigations of seismogenesis, Nankai Trough, Japan; Expeditions 314, 315, and 316 of the riser drilling platform from and to Shingu, Japan; Sites C0001-C0006, 21 September-15 November 2007; and Sites C0001 and C0002, 16 November-18 December 2007; and Sites C0004 and C0006-C0008, 19 December 2007-5 February 2008
IODP Management International, Washington, DC, United States
314/315/316
Iodine concentration and (super 129) I/I ratios were determined in interstitial fluid collected from the Nankai Trough accretionary prism during Integrated Ocean Drilling Program (IODP) Expeditions 315 and 316. Iodine concentrations increase rapidly in the uppermost 100 m below the seafloor, before concentrations reach stable values between 200 and 400 mu M, reflecting the advection of iodine released during the degradation of organic matter in deep sediments. The (super 129) I/I ratios in the interstitial fluid start just below preanthropogenic seawater values and decrease rapidly with depth to ratios approximately 400X10 (super 15) . These ratios result in ages for the potential iodine source formation between 30 and 40 Ma, which are clearly older than the host sediments and demonstrate that advection of fluids is responsible for the observed distribution of iodine at these sites. Significant increases in (super 129) I/I ratios uphole are found just above the lithologic boundary between the overlying forearc basin and older accreted sediments. This observation suggests that only limited migration of ascending deep fluids occurs beyond the lithologic boundary, where sediment porosity drops abruptly from 60% to 50%, and that fluids move preferentially along the lithologic boundary.
Coverage:Geographic coordinates:
North:33.1800
West:136.3800East: 136.4300
South:33.1400

Isotope geochemistry; Oceanography; accretionary wedges; Asia; boreholes; concentration; continental margin; cores; Far East; geochemistry; halogens; Honshu; hydrochemistry; I-129; Integrated Ocean Drilling Program; iodine; IODP Site C0001; IODP Site C0002; isotopes; Japan; Kii Peninsula; marine sediments; Nankai Trough; NanTroSEIZE; North Pacific; Northwest Pacific; Pacific Ocean; pore water; porosity; radioactive isotopes; sediments; spatial variations; tracers; West Pacific;

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