Oxidative sulfur cycling in the deep biosphere of the Nankai Trough, Japan

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doi: 10.1130/G31085.1
Author(s): Riedinger, Natascha; Brunner, B.; Formolo, M. J.; Solomon, E.; Kasten, S.; Strasser, M.; Ferdelman, T. G.
Author Affiliation(s): Primary:
Max Planck Institute for Marine Microbiology, Bremen, Federal Republic of Germany
University of Washington, United States
Alfred Wegener Institute for Polar and Marine Research, Federal Republic of Germany
University of Bremen, Federal Republic of Germany
Volume Title: Geology (Boulder)
Source: Geology (Boulder), 38(9), p.851-854. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613 CODEN: GLGYBA
Note: In English. With GSA Data Repository Item 2010236. 28 refs.; illus., incl. sect.
Summary: The existence of oxidative microbial sulfur cycling in the deep biosphere has been postulated, but it is difficult to identify because isotope effects of reductive sulfur cycling generally overprint those of oxidative sulfur cycling. In the sediments at Integrated Ocean Drilling Program (IODP) Site C0007 (Holes A-C) drilled and sampled during IODP Expedition 316 at the Nankai Trough, Japan, sulfur and oxygen isotope compositions of dissolved and solid-phase sulfur compounds show evidence for a discrete zone of deep oxidative sulfur cycling. The sulfate concentration profile and isotope values show two distinct sulfate reduction regimes: one for downward-diffusing sulfate in the uppermost 36 m of sediment (unit I), and another zone below 90 m, where sulfate diffuses upward from a deep subsurface fluid. The sulfur and oxygen isotope composition of sulfate and a dramatic change in solid-phase iron geochemistry indicate that oxidative sulfur cycling occurs at depth. The highly dynamic sedimentary and tectonic regime at Nankai Trough has created an environment in the subsurface where geochemical gradients can sustain deep oxidative sulfur cycling over long durations of time.
Year of Publication: 2010
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 02 Geochemistry; 07 Marine Geology and Oceanography; Asia; Biosphere; Concentration; Expedition 316; Far East; Geochemical cycle; Geochemistry; IODP Site C0007; Integrated Ocean Drilling Program; Iron; Isotope ratios; Isotopes; Japan; Marine sediments; Metals; Nankai Trough; North Pacific; Northwest Pacific; O-18/O-16; Oxidation; Oxygen; Pacific Ocean; Pore water; S-34/S-32; Sediments; Stable isotopes; Sulfate ion; Sulfur; Sulfur cycle; Troughs; West Pacific
Coordinates: N330114 N330119 E1364757 E1364753
Record ID: 2010077605
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