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題名 | Mineralogy and Physical Properties of Cored Sediments from the Gas Hydrate Potential Area of Offshore Southwestern Taiwan=臺灣西南外海天然氣水合物賦存區沉積物岩心之礦物學及物理性質 |
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作 者 | 江威德; 陳汝勤; 黃柏鈞; 陳君榮; 李永棠; 黃品儒; 龍潔嘉; 黃少薇; | 書刊名 | Terrestrial, Atmospheric and Oceanic Sciences |
卷期 | 17:4 民95.12 |
頁次 | 頁981-1007 |
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; 沉積物; 礦物學; Gas hydrate; Taiwan; Porosity; Density; Clay minerals; Pyrite; |
語文 | 英文(English) |
英文摘要 | Cored sediments from the gas hydrate prospect area offshore southwestern Taiwan exhibit porosities, water contents, and bulk densities comparable to sediments in other gas-hydrate potential areas. Short-distance transport and rapid deposition of the sediments are implied by their poor sorting and detrital and clay mineralogy. These features and the organicrich nature of the sediments present an environment suitable for formation of gas hydrates. High methane concentrations of porewaters and gas-escape structures of the sediments further imply possible occurrence of gas hydrates in the region. Prominent overgrowth microstructures on authigenic pyrite framboids at shallow depths are consistent with sulfate reduction and pyrite precipitation related to migration and oxidation of methane possibly released from gas hydrate zones at later stages of early diagenesis. |
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