Ledford-Hoffman, P A; DeMaster, David J; Nittrouer, Charles A (1986): Silicate and opal in the Ross Sea [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.58017, 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, https://doi.org/10.1016/0016-7037(86)90263-2
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Abstract:
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.
Project(s):
Silicon Cycling in the World Ocean (SINOPS)
Funding:
Coverage:
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
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample, optional label/labor no | Lab no | Ledford-Hoffman, P A | |||
| 2 | Depth, bathymetric | Bathy depth | m | Ledford-Hoffman, P A | ||
| 3 | LATITUDE | Latitude | Geocode | |||
| 4 | LONGITUDE | Longitude | Geocode | |||
| 5 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 6 | Depth, top/min | Depth top | m | Ledford-Hoffman, P A | ||
| 7 | Depth, bottom/max | Depth bot | m | Ledford-Hoffman, P A | ||
| 8 | Opal, biogenic silica | bSiO2 | % | Ledford-Hoffman, P A | Opal, extraction; DeMaster, 1981 | |
| 9 | Silicate | Si(OH)4 | µmol/l | Ledford-Hoffman, P A |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
113 data points
Data
| 1 Lab no | 2 Bathy depth [m] | 3 Latitude | 4 Longitude | 5 Depth sed [m] | 6 Depth top [m] | 7 Depth bot [m] | 8 bSiO2 [%] | 9 Si(OH)4 [µmol/l] |
|---|---|---|---|---|---|---|---|---|
| DF83III-6 | -78.7000 | -178.5000 | -0.100 | 65.000 | ||||
| DF83III-6 | -78.7000 | -178.5000 | 0.005 | 0.000 | 0.010 | 24.00 | 340.000 | |
| DF83III-6 | -78.7000 | -178.5000 | 0.015 | 420.000 | ||||
| DF83III-6 | -78.7000 | -178.5000 | 0.025 | 520.000 | ||||
| DF83III-6 | -78.7000 | -178.5000 | 0.035 | 540.000 | ||||
| DF83III-6 | -78.7000 | -178.5000 | 0.085 | 650.000 | ||||
| DF83III-6 | -78.7000 | -178.5000 | 0.105 | 0.100 | 0.110 | 23.60 | ||
| DF83III-6 | -78.7000 | -178.5000 | 0.145 | 700.000 | ||||
| DF83III-6 | -78.7000 | -178.5000 | 0.225 | 0.220 | 0.230 | 26.00 | ||
| DF83III-6 | -78.7000 | -178.5000 | 0.405 | 0.400 | 0.410 | 20.50 | ||
| DF83III-28 | -1024.0 | -76.8300 | -152.5100 | 0.005 | 0.000 | 0.010 | 2.00 | |
| DF83III-28 | -1025.0 | -76.8300 | -152.5100 | 0.105 | 0.100 | 0.110 | 0.50 | |
| DF83III-28 | -1026.0 | -76.8300 | -152.5100 | 0.225 | 0.220 | 0.230 | 0.70 | |
| DF83III-29 | -933.0 | -76.7250 | -152.6500 | -0.100 | 85.000 | |||
| DF83III-29 | -933.0 | -76.7250 | -152.6500 | 0.005 | 270.000 | |||
| DF83III-29 | -933.0 | -76.7250 | -152.6500 | 0.015 | 275.000 | |||
| DF83III-29 | -933.0 | -76.7250 | -152.6500 | 0.025 | 280.000 | |||
| DF83III-29 | -933.0 | -76.7250 | -152.6500 | 0.045 | 330.000 | |||
| DF83III-29 | -933.0 | -76.7250 | -152.6500 | 0.075 | 320.000 | |||
| DF83III-29 | -933.0 | -76.7250 | -152.6500 | 0.105 | 310.000 | |||
| DF83II-2 | -76.3500 | 164.7000 | 0.005 | 0.000 | 0.010 | 16.70 | ||
| DF83II-2 | -76.3500 | 164.7000 | 0.085 | 0.080 | 0.090 | 13.80 | ||
| DF83II-2 | -76.3500 | 164.7000 | 0.205 | 0.200 | 0.210 | 12.70 | ||
| DF83II-2 | -76.3500 | 164.7000 | 0.285 | 0.280 | 0.290 | 8.70 | ||
| DF83II-27 | -76.0000 | 172.0000 | 0.005 | 0.000 | 0.010 | 35.00 | ||
| DF83II-27 | -76.0000 | 172.0000 | 0.105 | 0.100 | 0.110 | 37.00 | ||
| DF83II-27 | -76.0000 | 172.0000 | 0.225 | 0.220 | 0.230 | 39.00 | ||
| DF83II-27 | -76.0000 | 172.0000 | 0.375 | 0.370 | 0.380 | 31.00 | ||
| DF83II-10 | -73.1500 | 167.5000 | 0.005 | 0.000 | 0.010 | 40.70 | ||
| DF83II-10 | -73.1500 | 167.5000 | 0.105 | 0.100 | 0.110 | 38.00 | ||
| DF83II-10 | -73.1500 | 167.5000 | 0.225 | 0.220 | 0.230 | 43.90 | ||
| DF83II-10 | -73.1500 | 167.5000 | 0.405 | 0.400 | 0.410 | 48.30 |