Varnavas, Soterios (1987): Marine barite in sediments of DSDP Site 54-424 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.756995, Supplement to: Varnavas, S (1987): Marine barite in sediments from Deep Sea Drilling Project Sites 424 and 424A (Galapagos hydrothermal mounds field). Marine Chemistry, 20(3), 245-253, https://doi.org/10.1016/0304-4203(87)90075-2
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Abstract:
The distribution of barite in sediments from D.S.D.P. sites 424 and 424A at the Galapagos hydrothermal mounds field is determined and the process of its formation is deduced. Barite in these deposits is associated with calcareous sediments and is completely absent from the hydrothermal material (manganese crusts and nontronite). Its concentrations tend to increase in the deeper sediments. Since manganese crusts contain significant amounts of Ba, a lack of barite in them is probably due to low concentrations of [SO4]2 in the sediment-seawater interface where they form. The formation of barite occurs within buried sediments, the interstitial waters of which are saturated with [SO4]2. The most probable source of [SO4]2- is the oxidation of H2S which is released from the hydrothermal fluids percolating upwards through the sediments. Although nontronite is formed within buried sediments the environmental conditions occurring during its formation (reducing) prevent barite formation.
The association of barite with calcareous sediments is due to the release of Ba by calcareous microorganisms and/or to high concentrations of Ca in the pore waters which maintain a high pH and hence [SO4]2- is stable.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 0.591300 * Median Longitude: -86.130250 * South-bound Latitude: 0.588800 * West-bound Longitude: -86.130300 * North-bound Latitude: 0.593800 * East-bound Longitude: -86.130200
Date/Time Start: 1977-05-23T00:00:00 * Date/Time End: 1977-05-23T00:00:00
Event(s):
54-424 * Latitude: 0.593800 * Longitude: -86.130300 * Date/Time: 1977-05-23T00:00:00 * Elevation: -2685.0 m * Penetration: 76 m * Recovery: 36.4 m * Location: North Pacific/MOUND * Campaign: Leg54 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 7 cores; 66.5 m cored; 9.5 m drilled; 54.8 % recovery
54-424A * Latitude: 0.588800 * Longitude: -86.130200 * Date/Time: 1977-05-23T00:00:00 * Elevation: -2708.0 m * Penetration: 34 m * Recovery: 13.8 m * Location: North Pacific/MOUND * Campaign: Leg54 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 4 cores; 34 m cored; 0 m drilled; 40.5 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Varnavas, S (1987): (Table 1) Concentrations of Ba and other elements forming major pahses in sediments from DSDP Hole 54-424. https://doi.org/10.1594/PANGAEA.756993
- Varnavas, S (1987): (Table 2) Concentrations of Ba and other elements forming major pahses in sediments from DSDP Hole 54-424A. https://doi.org/10.1594/PANGAEA.756994