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題 名 | Methane Migration and Its Influence on Sulfate Reduction in the Good Weather Ridge Region, South China Sea Continental Margin Sediments=臺灣西南海域天然氣水合物好景區沈積物硫酸鹽還原作用受甲烷擴散之影響 |
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作 者 | 林曉武; 謝偉琦; 林裕程; 楊燦堯; 劉家瑄; 王詠絢; | 書刊名 | Terrestrial, Atmospheric and Oceanic Sciences |
卷 期 | 17:4 民95.12 |
頁 次 | 頁883-902 |
專 輯 | 南海與臺灣鄰近地區之天然氣水合物研究專刊 |
分類號 | 351.983 |
關鍵詞 | 臺灣西南海域; 天然氣水合物; 沈積物; 硫酸鹽; 甲烷; Sulfate reduction; Gas hydrate; Pyrite; Diffusion; South China sea; |
語 文 | 英文(English) |
英文摘要 | Bacteria sulfate reduction is a major pathway for organic carbon oxidation in marine sediments. Upward diffusion of methane from gas hydrate deep in the sedimentary strata might be another important source of carbon for sulfate reducing bacteria and subsequently induce higher rates of sulfate reduction in sediments. Since abundant gas may migrate upward to the surface as a result of tectonic activity occurring in the accretionary wedge, this study investigates the effect of methane migration on the sulfate reduction process in continental margin sediments offshore southwestern Taiwan. Piston and gravity core samples were taken in order to evaluate vertical and spatial variations of sulfate and methane. Pore water sulfate, sulfide, methane, sediment pyrite, and organic carbon were extracted and analyzed. Rapid sulfate reduction, high pyrite contents in sediments and higher concentrations of dissolved sulfide and methane were found in the study area with relatively low organic carbon concentrations. Up to 300 µmole g -1 of pyrite, 10 mM dissolved sulfide and 9 mM methane were found in the study region. Sulfate depletion was as shallow as ~1 m beneath the sediment/water interface. At similar water depths, however, low methane and pyrite were found in some areas with almost no sulfate reduction. Sulfate flux in the study region is among the highest reported. Large spatial variations were a result of high methane flux, probably originating from gas hydrate deeper in sediments. Co-existence of rapid sulfate reduction and high methane concentrations in sediments indicated that methane is controlling sulfate reduction in the region. Downward diffusion of sulfate is linearly correlated with upward methane flux in the Good Weather Ridge region. Methane becomes an important source of carbon for the sulfate reducer and subsequently controlling sulfate reduction and pyrite formation. |
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