| 海洋沉积物孔隙水硫酸盐浓度和碳同位素对天然气水合物的指示 |
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| 关键词:sulfate gradients carbon isotopes pore water gas hydrate |
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| Sulfate Concentrations and Carbon Isotopic Compositions as Indicators of Marine Gas Hydrates |
| Beiing an important constituent in pore water of marine sediments, sulfate （SO42－） acts as an oxidation agent involved in organic matter or methane oxidation reactions induced by microbial activity. These chemical reactions deplete sulfate within pore waters of the sulfate reduction zone, and also decrease carbon isotopic compositions of dissolved CO2. It is demonstrated that in gas hydrate areas such as the Blake Ridge, the strong andaerobic methane oxidation reaction produces linear and steeper sulfate gradients with shallow SMI depths. In the Blake Ridge, the SMI depths are between 5.1 m and 23.9m, with δ13C values as negative as -39%. It is found that several sites in the South China Sea also show shallow SMI depths (7.5m~17.2m) and low δ13C values （－29‰）,similar to characteristics of the Blake Ridge, Combined with other geological, geophysical and geochemical evidence, it is considered that these sites may have great potential for gas hydrate accumulation at depths and therefore deserve furthe detailed exploration. |
| JIANG Shaoyong,YANG Tao,GE Lu,LING Hongfei,YANG Jinghong,WU Nengyou,CHEN Daohua,LIU Jian.2005.Sulfate Concentrations and Carbon Isotopic Compositions as Indicators of Marine Gas Hydrates[J].Acta Geoscientica Sinica,26(z1):190-191. |
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