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• W1978370937 endingPage "575" @default.
• W1978370937 startingPage "563" @default.
• W1978370937 abstract "Sediment cores from the middle to lower slope of the southern continental margin of Australia between the Great Australian Bight and western Tasmania are compared in terms of marine and terrigenous input signals during the Holocene. The mass accumulation rates of carbonate, organic carbon, biogenic Ba, and Al are corrected for lateral sediment input (focusing), using the inventory of excess 230Th in the sediment normalised to its known production rate in the water column above each site. The biogenic signal is generally higher in the eastern part of the southern margin probably due to enhanced productivity associated with seasonal upwelling off southeastern South Australia and the proximity of the Subtropical Front, which passes just south of Tasmania. The input of Al, representing the terrigenous signal, is also higher in this region reflecting the close proximity of river runoff from the mountainous catchment of southeastern Australia. The distribution pattern of Mn and authigenic U, together with pore‐water profiles of Mn++, indicate diagenetic reactions driven by the oxidation of buried organic carbon in an oxic to suboxic environment. Whereas Mn is reduced at depth and diffuses upwards to become immobilised in a Mn‐rich surface layer, U is derived from seawater and diffuses downward into the sediment, driven by reduction and precipitation at a depth below the reduction zone of Mn. The estimated removal rate of U from seawater by this process is within the range of U removal measured in hemipelagic sediments from other areas, and supports the proposition that hemipelagic sediments are a major sink of U in the global ocean. Unlike Mn, the depth profile of sedimentary Fe appears to be little affected by diagenesis, suggesting that little of the total Fe inventory in the sediment is remobilised and redistributed as soluble Fe." @default.
• W1978370937 created "2016-06-24" @default.
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• W1978370937 date "1999-08-01" @default.
• W1978370937 modified "2023-10-09" @default.
• W1978370937 title "Biogeochemistry of southern Australian continental slope sediments" @default.
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• W1978370937 doi "https://doi.org/10.1046/j.1440-0952.1999.00729.x" @default.
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