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dc.contributor.authorJamieson, John W.  Concept link
dc.contributor.authorHannington, Mark D.  Concept link
dc.contributor.authorClague, David A.  Concept link
dc.contributor.authorKelley, Deborah S.  Concept link
dc.contributor.authorDelaney, John R.  Concept link
dc.contributor.authorHolden, James F.  Concept link
dc.contributor.authorTivey, Margaret K.  Concept link
dc.contributor.authorKimpe, Linda E.  Concept link
dc.date.accessioned2013-10-10T17:22:07Z
dc.date.available2014-10-22T08:57:21Z
dc.date.issued2013-07-08
dc.identifier.citationGeochemistry, Geophysics, Geosystems 14 (2013); 2084–2099en_US
dc.identifier.urihttps://hdl.handle.net/1912/6257
dc.descriptionAuthor 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.en_US
dc.description.abstractForty-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.en_US
dc.description.sponsorshipThis work was supported by a NSERC PGS scholarship and SEG Canada Foundation Student Research grant to J. W. Jamieson, NSERC Discovery grant to M. D. Hannington, NSF Ocean Sciences grant OCE-0732661 to J. F. Holden, and NSF grant OCE-1038135 to M. K. Tivey. D. A. Clague and the MBARI cruise were supported by a grant to MBARI from the David and Lucile Packard Foundation.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherJohn Wiley & Sonsen_US
dc.relation.urihttps://doi.org/10.1002/ggge.20133
dc.subjectHydrothermalen_US
dc.subjectSulphideen_US
dc.subjectGeochronologyen_US
dc.subjectEndeavouren_US
dc.titleSulfide geochronology along the Endeavour Segment of the Juan de Fuca Ridgeen_US
dc.typeArticleen_US
dc.description.embargo2014-01-08en_US
dc.identifier.doi10.1002/ggge.20133


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