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Ledford-Hoffman, P A; DeMaster, David J; Nittrouer, Charles A (1986): Silicate and opal in the Ross Sea. PANGAEA,, Supplement to: Ledford-Hoffman, PA et al. (1986): Biogenic-silica accumulation in the Ross Sea and the importance of Antarctic continental-shelf deposits in the marine silica budget. Geochimica et Cosmochimica Acta, 50(9), 2099-2110,

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Thirty-five box cores were collected from the continental shelf in the Ross Sea during cruises in January and February, 1983. Pb-210 and Pu-239, 240 geochronologies coupled with biogenic-silica measurements were used to calculate accumulation rates of biogenic silica. Sediment in the southern Ross Sea accumulates at rates ranging from <=0.6 to 2.7 mm/y, with the highest values occurring in the southwestern Ross Sea. Biogenic-silica content in surface sediments ranges from 2% (by weight) in Sulzberger Bay and the eastern Ross Sea to 41% in the southwestern Ross Sea. Biogenic-silica accumulation in the southwestern Ross Sea averages 2.7 * 10**-2 g/cm**2/y and is comparable to accumulation rates in high-productivity, upwelling environments from low-latitude continental margins (e.g., Gulf of California, coast of Peru). The total rate of biogenic-silica accumulation in the southern Ross Sea is approximately 0.2 * 10**14 g/y, with most of the accumulation occurring in basins (500-1000 m water depth). If biogenic-silica accumulation in the southern Ross Sea continental shelf is typical of other basins on the Antarctic continental shelf, as much as 1.2 * 10**14 g/y of silica could be accumulating in these deposits. Biogenic-silica accumulation on the Antarctic continental shelf may account for as much as a fourth of the dissolved silica supplied to the world ocean by rivers and hydrothermal vents.
Median Latitude: -76.767656 * Median Longitude: -175.446250 * South-bound Latitude: -78.700000 * West-bound Longitude: 164.700000 * North-bound Latitude: -73.150000 * East-bound Longitude: -152.510000
Minimum DEPTH, sediment/rock: -0.100 m * Maximum DEPTH, sediment/rock: 0.405 m
Ledford * Method/Device: Box corer (BC) * Comment: Position not given
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Sample, optional label/labor noLab noLedford-Hoffman, P A
2Depth, bathymetricBathy depthmLedford-Hoffman, P A
5DEPTH, sediment/rockDepthmGeocode
6Depth, top/minDepth topmLedford-Hoffman, P A
7Depth, bottom/maxDepth botmLedford-Hoffman, P A
8Opal, biogenic silicabSiO2%Ledford-Hoffman, P AOpal, extraction; DeMaster, 1981
9SilicateSi(OH)4µmol/lLedford-Hoffman, P A
113 data points

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