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    Methane, manganese, and helium in hydrothermal plumes following volcanic eruptions on the East Pacific Rise near 9°50′N

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    2008GC002104.pdf (481.4Kb)
    Date
    2008-06-28
    Author
    Love, Brooke A.  Concept link
    Resing, Joseph A.  Concept link
    Cowen, James P.  Concept link
    Lupton, John E.  Concept link
    Fornari, Daniel J.  Concept link
    Shank, Timothy M.  Concept link
    Biller, Dondra  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3284
    As published
    https://doi.org/10.1029/2008GC002104
    DOI
    10.1029/2008GC002104
    Keyword
     Hydrothermal; Plume; Methane isotopes 
    Abstract
    As part of a rapid response cruise in May 2006, we surveyed water column hydrothermal plumes and bottom conditions on the East Pacific Rise between 9°46.0′N and 9°57.6′N, where recent seafloor volcanic activity was suspected. Real-time measurements included temperature, light transmission, and salinity. Samples of the plume waters were analyzed for methane, manganese, helium concentrations, and the δ 13C of methane. These data allow us to examine the effects of the 2005–2006 volcanic eruption(s) on plume chemistry. Methane and manganese are sensitive tracers of hydrothermal plumes, and both were present in high concentrations. Methane reached 347 nM in upper plume samples (250 m above seafloor) and exceeded 1085 nM in a near-bottom sample. Mn reached 54 nM in the upper plume and 98 nM in near-bottom samples. The concentrations of methane and Mn were higher than measurements made after a volcanic eruption in the same area in 1991, but the ratio of CH4/Mn, at 6.7, is slightly lower, though still well above the ratios measured in chronic plumes. High concentrations of methane in near-bottom samples were associated with areas of microbial mats and diffuse venting documented in seafloor imagery. The isotopic composition of the methane carbon shows evidence of active microbial oxidation; however, neither the fractionation factor nor the source of the eruption-associated methane can be determined with any certainty. Considerable scatter in the isotopic data is due to diverse sources for the methane as well as fractionation as methane is consumed. One sample at +21‰ versus Peedee belemnite standard is among the most enriched methane carbon values reported in a hydrothermal plume to date.
    Description
    Author Posting. © American Geophysical Union, 2008. 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 9 (2008): Q06T01, doi:10.1029/2008GC002104.
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    • Geology and Geophysics (G&G)
    • Biology
    Suggested Citation
    Geochemistry Geophysics Geosystems 9 (2008): Q06T01
     

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