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Uranium and manganese are two redox-sensitive trace elements with complementary behavior. Under anoxic conditions, U is immobile, while reduced Mn is dissolved in pore water of sediments. Uranium diffuses from sea water into reducing sediments and is enriched there. The depth of the reducing layers and the sediment accumulation rate determine the enrichment of authigenic uranium. On the contrary,...
We have evaluated, using a numerical model, the burn-down depth (depth of post-depositional oxygenation) of organic matter-rich sapropels under aerobic conditions at the seafloor. The model suggests that sapropels may be erased by burn-down to depths of at least 5 cm after 10 kyr of bottom-water reoxygenation. A test of the sensitivity shows that the parameters exerting a major control over the burn-down...
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