Silicate and opal in the Ross Sea ...

• Main Authors: Ledford-Hoffman, P A, DeMaster, David J, Nittrouer, Charles A
• Format: Dataset
• Language: English
• Published: PANGAEA 1986
• Subjects: Sample, optional label/labor no; Depth, bathymetric; LATITUDE; LONGITUDE; DEPTH, sediment/rock; Depth, top/min; Depth, bottom/max; Opal, biogenic silica; Silicate; Box corer; Opal, extraction; DeMaster, 1981; Silicon Cycling in the World Ocean SINOPS; Antarc*; Antarctic; Ross Sea; Sulzberger Bay
• Online Access: https://dx.doi.org/10.1594/pangaea.58017; https://doi.pangaea.de/10.1594/PANGAEA.58017

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 ... : Supplement to: Ledford-Hoffman, P A; DeMaster, David J; Nittrouer, Charles A (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 ...