Micromanganese nodules in deep-sea sediments: Uranium-isotopic evidence for post-depositional origin |
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Authors: | Robert Immel JK Osmond |
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Institution: | Department of Geology, Florida State University, Tallahassee, Fla. 32306 U.S.A. |
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Abstract: | Micromanganese nodules from three deep-sea cores are found to contain less U than average nodules dredged from the sea floor. The ratio in these micronodules is higher than any previously reported in deep-sea sediments. We interpret these data to mean that at least some micronodules form well after deposition of the enclosing sediments, in particular where conditions are less oxidizing than average. |
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