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

Natascha Riedinger, B. Brunner, M. J. Formolo, E. Solomon, S. Kasten, M. Strasser and T. G. Ferdelman
Oxidative sulfur cycling in the deep biosphere of the Nankai Trough, Japan
Geology (Boulder) (September 2010) 38 (9): 851-854


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.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 38
Serial Issue: 9
Title: Oxidative sulfur cycling in the deep biosphere of the Nankai Trough, Japan
Affiliation: Max Planck Institute for Marine Microbiology, Bremen, Federal Republic of Germany
Pages: 851-854
Published: 201009
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 28
Accession Number: 2010-077605
Categories: OceanographyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2010236
Illustration Description: illus. incl. sect.
N33°01'14" - N33°01'19", E136°47'53" - E136°47'57"
Secondary Affiliation: University of Washington, USA, United StatesAlfred Wegener Institute for Polar and Marine Research, DEU, Federal Republic of GermanyUniversity of Bremen, DEU, Federal Republic of Germany
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201041
Program Name: IODPIntegrated Ocean Drilling Program
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