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| Huang, Yin-sheng; Hsu, Shu-kun; Su, Chih-chieh; Lin, Andrew Tien-shun; Yu, Pai-sen; Babonneau, Nathalie; Ratzov, Gueorgui; Lallemand, Serge; Huang, Pi-chuen; Lin, Shiao-shan; Lin, Jing-yi; Wei, Kuo-yen; Chang, Yuan-pin; Yu, Neng-ti; Tsai, Ching-hui. |
| 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... |
| Tipo: Text |
Palavras-chave: MD core; Shallow gas hydrate; Hydrate dissociation; Off SW Taiwan. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00680/79253/81769.pdf |
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| Chen, Ju-chin; Lo, C. Y.; Lee, Y.t.; Huang, S. W.; Chou, P. C.; Yu, H. S.; Yang, T.f.; Wang, Y. S.; Chung, S. H.. |
| The cored sediments sampled by R/V Marion Dufrense are mostly muds consisting mainly of quartz, feldspar, illite, chlorite + kaolinite and calcite. Authigenic carbonates mainly composed of aragonite, calcite, dolomite and associated with Fe-montmorillonite and pyrite occur in core samples collected from station MD-052911 (22 degrees 15.6' N, 119 degrees 51.0' E) at 2137-2140 cm and 2237-2240 cm depth which may be formed via sulfate reduction by CH4. In general Illite/Quartz intensity ratios of the sediments show little variation with core depth indicating the relatively constant abundance of illite in the source rock on Taiwan. The cored sediments have higher average Al2O3, Sigma FeO and MgO but lower SiO2, Na2O, and CaO contents when compared with upper... |
| Tipo: Text |
Palavras-chave: Cored sediments; Mineralogy and chemistry; Active margin; Off SW Taiwan. |
| Ano: 2007 |
URL: https://archimer.ifremer.fr/doc/00235/34618/32942.pdf |
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