https://scholars.lib.ntu.edu.tw/handle/123456789/571838
標題: | Shallow gas hydrates off southwest Taiwan and their mechanisms | 作者: | Huang Y.-S Hsu S.-K CHIH-CHIEH SU Lin A.T.-S Yu P.-S Babonneau N Ratzov G Lallemand S Huang P.-C Lin S.-S Lin J.-Y Wei K.-Y Chang Y.-P Yu N.-T Tsai C.-H. |
關鍵字: | Carbonates; Hydration; Methane; Sediments; Silt; Authigenic carbonates; Core features; Fine silt; Geological setting; High flux; Sea floor; Sediment properties; Shallow gas; Gas hydrates; authigenesis; core analysis; cruise report; fine grained sediment; gas hydrate; hydrocarbon reservoir; pockmark; seafloor; sediment property; silt; structural geology; unconformity; Taiwan | 公開日期: | 2021 | 卷: | 42 | 期: | 1 | 來源出版物: | Marine Geophysical Research | 摘要: | We have collected two shallow gas hydrate samples at two sites having different geological settings off southwest Taiwan during the cruise MD214 in 2018. The first core site, MD18-3542, is on the South Yuan-An East Ridge at ~ 1200 m water deep, where a structural unconformity covered by fine-silt sediments appears at ~ 5.5 m below the seafloor. The second core site, MD18-3543, is close to the Good-Weather Ridge at ~ 1100 m water deep, where a gas-related pockmark structure and authigenic carbonates are present at shallow strata with fine-silt sediments near the seafloor. Sediment properties of core MD18-3542 are distinctively different above and below the layer corresponding to the unconformity. Both cores show obvious gaps or voids in the lower core halves. The core features could be linked to the dissociated methane upward migrating from deep strata. Core site settings with upwelling methane would favor the formation of shallow gas hydrates. At site MD18-3542, the shallow hydrate could be formed due to high concentration methane kept beneath the unconformity covered by fine-silt sediments. At site MD18-3543, the shallow hydrate could be formed due to an extremely high flux of upwelling methane trapped either beneath the authigenic carbonates or fine-silt sediments. ? 2021, The Author(s). |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85101186052&doi=10.1007%2fs11001-021-09429-x&partnerID=40&md5=99b2781239b497f063ba0b208566c7af https://scholars.lib.ntu.edu.tw/handle/123456789/571838 |
ISSN: | 253235 | DOI: | 10.1007/s11001-021-09429-x |
顯示於: | 海洋研究所 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。