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    Hydrothermal activity on the ultra-slow spreading southern Knipovich Ridge

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    2007GC001652.pdf (389.9Kb)
    Date
    2007-08-28
    Author
    Connelly, Douglas P.  Concept link
    German, Christopher R.  Concept link
    Asada, Miho  Concept link
    Okino, K.  Concept link
    Egorov, A.  Concept link
    Naganuma, T.  Concept link
    Pimenov, N.  Concept link
    Cherkashev, G.  Concept link
    Tamaki, K.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3264
    As published
    https://doi.org/10.1029/2007GC001652
    DOI
    10.1029/2007GC001652
    Keyword
     Hydrothermal; Arctic; Serpentinization; Knipovich Ridge 
    Abstract
    We report first evidence for hydrothermal activity from the southern Knipovich Ridge, an ultra-slow spreading ridge segment in the Norwegian-Greenland Sea. Evidence comes from optical backscatter anomalies collected during a systematic side-scan sonar survey of the ridge axis, augmented by the identification of biogeochemical tracers in the overlying water column that are diagnostic of hydrothermal plume discharge (Mn, CH4, ATP). Analysis of coregistered geologic and oceanographic data reveals that the signals we have identified are consistent with a single high-temperature hydrothermal source, located distant from any of the axial volcanic centers that define second-order segmentation along this oblique ridge system. Rather, our data indicate a hydrothermal source associated with highly tectonized seafloor that may be indicative of serpentinizing ultramafic outcrops. Consistent with this hypothesis, the hydrothermal plume signals we have detected exhibit a high methane to manganese ratio of 2–3:1. This is higher than that typical of volcanically hosted vent sites and provides further evidence that the source of the plume signals reported here is most probably a high-temperature hydrothermal field that experiences some ultramafic influence (compare to Rainbow and Logachev sites, Mid-Atlantic Ridge). While such sites have previously been invoked to be common on the SW Indian Ridge, this may be the first such site to be located along the Arctic ultra-slow spreading ridge system.
    Description
    Author Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 8 (2007): Q08013, doi:10.1029/2007GC001652.
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    • Geology and Geophysics (G&G)
    Suggested Citation
    Geochemistry Geophysics Geosystems 8 (2007): Q08013
     

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