Iron and manganese micro-precipitates within a cretaceous biosiliceous ooze from the Arctic Ocean: possible hydrothermal source |
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| Authors: | Patricia Stoffyn-Egli |
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| Institution: | (1) Geological Survey of Canada, Atlantic Geoscience Centre, Box 1006, B2Y 4A2 Dartmouth, Nova Scotia, Canada |
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| Abstract: | The oldest sediment most recently recovered from the Arctic Ocean is a biosiliceous ooze nearly devoid of nonbiogenic particles and exhibiting small-scale color changes. Color variations are due to changes in iron and manganese content. These elements are probably of local hydrothermal origin, and the Mn precipitation may be bacteria-mediated. An iron silicate phase seems to form at the expense of biogenic silica. The ooze deposited slowly until a sudden sediment input, probably a volcanigenic deposit now weathered to clay minerals, induced dissolution of siliceous microfossils. This clay layer contains calcium phosphate microspheres enriched in rare earth elements. |
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