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    Sulfide geochronology along the Endeavour Segment of the Juan de Fuca Ridge

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    ggge20133.pdf (1.242Mb)
    Date
    2013-07-08
    Author
    Jamieson, John W.  Concept link
    Hannington, Mark D.  Concept link
    Clague, David A.  Concept link
    Kelley, Deborah S.  Concept link
    Delaney, John R.  Concept link
    Holden, James F.  Concept link
    Tivey, Margaret K.  Concept link
    Kimpe, Linda E.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6257
    As published
    https://doi.org/10.1002/ggge.20133
    DOI
    10.1002/ggge.20133
    Keyword
     Hydrothermal; Sulphide; Geochronology; Endeavour 
    Abstract
    Forty-nine hydrothermal sulfide-sulfate rock samples from the Endeavour Segment of the Juan de Fuca Ridge, northeastern Pacific Ocean, were dated by measuring the decay of 226Ra (half-life of 1600 years) in hydrothermal barite to provide a history of hydrothermal venting at the site over the past 6000 years. This dating method is effective for samples ranging in age from ∼200 to 20,000 years old and effectively bridges an age gap between shorter- and longer-lived U-series dating techniques for hydrothermal deposits. Results show that hydrothermal venting at the active High Rise, Sasquatch, and Main Endeavour fields began at least 850, 1450, and 2300 years ago, respectively. Barite ages of other inactive deposits on the axial valley floor are between ∼1200 and ∼2200 years old, indicating past widespread hydrothermal venting outside of the currently active vent fields. Samples from the half-graben on the eastern slope of the axial valley range in age from ∼1700 to ∼2925 years, and a single sample from outside the axial valley, near the westernmost valley fault scarp is ∼5850 ± 205 years old. The spatial relationship between hydrothermal venting and normal faulting suggests a temporal relationship, with progressive younging of sulfide deposits from the edges of the axial valley toward the center of the rift. These relationships are consistent with the inward migration of normal faulting toward the center of the valley over time and a minimum age of onset of hydrothermal activity in this region of 5850 years.
    Description
    Author Posting. © American Geophysical Union, 2013. 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 14 (2013); 2084–2099, doi:10.1002/ggge.20133.
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    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Geochemistry, Geophysics, Geosystems 14 (2013); 2084–2099
     

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