Astakhova, N V; Sorochinskaya, A V (1999): Chemical and isotopic compositions of authigenic carbonates from bottom sediments of Northwest Pacific marginal seas [dataset publication series]. Pacific Oceanology Institute, Far East Branch of Russian Academy of Sciences, PANGAEA, https://doi.org/10.1594/PANGAEA.775328, Supplement to: Astakhova, NV; Sorochinskaya, AV (1999): Authigenic carbonates in Upper Pleistocene - Holocene deposits of marginal seas, Northwest Pacific. Tikhookeanskaya Geologiya (Pacific Geology), 18(1), 41-49
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Abstract:
The paper presents data on authigenic carbonate distribution in Holocene - Upper Pleistocene deposits of the Okhotsk, Japan, East China, Philippine and South China Seas. Description of carbonate samples, their chemical and isotope compositions are given. Chemical analysis of the samples indicates that almost all authigenic carbonates are composed of calcite or magnesian calcite; and only in one case, of siderite. Oxygen isotopic composition (d18O) ranges from +37.7 to +26.1 per mil (SMOW); it is, probably, connected with different temperatures of carbonate formation. A distinct geographic regularity is traced. Decrease in d18O values is observed from the cold Okhotsk Sea to the warm South China Sea. A very wide range of carbon isotopic composition (d13C from -42 to +3.8 per mil) indicates different sources of carbonic acid required for formation of these carbonates. As a basis for carbon isotopic composition we can distinguish three sources of carbonic acid in the studied sediments: microbiological methane oxidation, organic matter destruction during sediment diagenesis, and dissolved organogenic limestone. Thus, formation of authigenic carbonates in sediments from the marginal seas of the Northwest Pacific results from: 1) sediment diagenesis, 2) methane oxidation in zones of gas anomalies, 3) their precipitation from the supersaturated by carbonates sea shoal waters of tropical sea lagoons.
Project(s):
Archive of Ocean Data (ARCOD)
Coverage:
Median Latitude: 25.031643 * Median Longitude: 122.056889 * South-bound Latitude: 8.943333 * West-bound Longitude: 108.513300 * North-bound Latitude: 54.576000 * East-bound Longitude: 155.305500
Date/Time Start: 1993-01-01T00:00:00 * Date/Time End: 1996-09-17T00:00:00
Event(s):
AN25-936 * Latitude: 51.015000 * Longitude: 148.313333 * Elevation: -1310.0 m * Location: Sea of Okhotsk * Campaign: AN_1993 * Basis: Akademik A Nesmeyanov * Method/Device: Box corer (BC)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Astakhova, NV; Sorochinskaya, AV (1999): (Table 2) Chemical composition of authigenic carbonates from bottom sediments of Northwest Pacific marginal seas. https://doi.org/10.1594/PANGAEA.775323
- Astakhova, NV; Sorochinskaya, AV (1999): (Table 6) Chemical composition of authigenic carbonate from bottom sediments of the South China Sea at Station AS-99-119. https://doi.org/10.1594/PANGAEA.775325
- Astakhova, NV; Sorochinskaya, AV (1999): (Table 7) Isotopic compositions of oxygen and carbon from authigenic carbonates of bottom sediments from Northwest Pacific marginal seas. https://doi.org/10.1594/PANGAEA.775326