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International Conference on Climate Change Global Warming

Berlin, Germany
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Uranium Deposition in Saanich Inlet Sediments, Vancouver Island

Author(s): Anderson RF, Lehuray AP, Fleisher MQ, Mur ray JW

Abstract

Deposition in organic-rich sediments is a major sink for uranium in the ocean. Uranium concentrations and 234U/238U ratios of paniculate matter collected by sediment traps and U concentrations in sediment pore waters collected in situ in Saanich Inlet were measured to study the process of U deposition in anoxic marine basins. The results provided direct evidence for two previously hypothesized mechanisms of U deposition in organic-rich sediments. Dissolved U is incorporated into particles in surface waters, possibly in association with autochthonous organic matter. Fluxes of paniculate authigenic U ranged between 0.025 and 0.4 dpm 238U cm−2 yr−1, with lowest fluxes occurring during winter months.

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