Postdepositional injections of uranium-rich solutions into East Pacific Rise sediments |
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| Authors: | H Rydell T Kraemer K Boström O Joensuu |
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| Institution: | Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Fla. U.S.A. |
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| Abstract: | An 8.5 m long apparently undisturbed core from a hilltop on the crest of the East Pacific Rise has uranium and thorium isotope distributions that are very unusual. The core is very poor in 232Th, and very rich in U, particularly at the 500-cm level, where a value of about 150 ppm is reached. At the same depth the 230Thxs reaches very large negative values. These facts could be accounted for if one assumes that solutions rich in U and poor in Th had been postdepositionally injected into the sediments about 90,000–110,000 years ago. The top of the sediment received much of its U from seawater, judging from the ratio. Possibly carbonate rich solutions were the carriers of the injected uranium. |
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