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    Reconstructing the evolution of the submarine Monterey Canyon System from Os, Nd, and Pb isotopes in hydrogenetic Fe-Mn crusts

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    Article (1.795Mb)
    Supporting Information S1 (562.1Kb)
    Data Set S1 (34.00Kb)
    Data Set S2 (52Kb)
    Data Set S3 (78Kb)
    Data Set S4 (127Kb)
    Date
    2017-11-15
    Author
    Conrad, Tracey A.  Concept link
    Nielsen, Sune G.  Concept link
    Peucker-Ehrenbrink, Bernhard  Concept link
    Blusztajn, Jerzy S.  Concept link
    Winslow, Dustin  Concept link
    Hein, James R.  Concept link
    Paytan, Adina  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/9462
    As published
    https://doi.org/10.1002/2017GC007071
    DOI
    10.1002/2017GC007071
    Keyword
     Ferromanganese crusts; Osmium isotopes; Neodymium isotopes; Lead isotopes; Monterey Canyon System; Seawater 
    Abstract
    The sources of terrestrial material delivered to the California margin over the past 7 Myr were assessed using 187Os/188Os, Nd, and Pb isotopes in hydrogenetic ferromanganese crusts from three seamounts along the central and southern California margin. From 6.8 to 4.5 (±0.5) Ma, all three isotope systems show more radiogenic values at Davidson Seamount, located near the base of the Monterey Canyon System, than in Fe-Mn crusts from the more remote Taney and Hoss Seamounts. At the Taney Seamounts, approximately 225 km farther offshore from Davidson Seamount, 187Os/188Os values, but not Pb and Nd isotope ratios, also deviate from the Cenozoic seawater curve toward more radiogenic values from 6.8 to 4.5 (±0.5) Ma. However, none of the isotope systems in Fe-Mn crusts deviate from seawater at Hoss Seamount located approximately 450 km to the south. The regional gradients in isotope ratios indicate that substantial input of dissolved and particulate terrestrial material into the Monterey Canyon System is responsible for the local deviations in the seawater Nd, Pb, and Os isotope compositions from 6.8 to 4.5 (±0.5) Ma. The isotope ratios recorded in Fe-Mn crusts are consistent with a southern Sierra Nevada or western Basin and Range provenance of the terrestrial material which was delivered by rivers to the canyon. The exhumation of the modern Monterey Canyon must have begun between 10 and 6.8 ± 0.5 Ma, as indicated by our data, the age of incised strata, and paleo-location of the Monterey Canyon relative to the paleo-coastline.
    Description
    Author Posting. © American Geophysical Union, 2017. 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 18 (2017): 3946–3963, doi:10.1002/2017GC007071.
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    • Geology and Geophysics (G&G)
    Suggested Citation
    Geochemistry, Geophysics, Geosystems 18 (2017): 3946–3963
     

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