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| Liu, Jianhua; Gao, Jinyao; Fang, Yinxia; Wu, Shuigen. |
| Based on the data of seismic reflection, seismic refraction and magnetism collected in the research area and geology obtained from adjacent areas, this paper deals with the issue of basement constitution of the southern part of the Okinawa Trough. In the shelf basin of the East China Sea, Taiwan folded belt and Ryukyu Islands folded belt which surround the trough, outcrop Later Paleozoic, Mesozoic and Eogene strata. In the southern trough, multichannel seismic reflection data indicate that the overlying strata are composed of Neogene and Quaternary deposits, and the acoustic basement consists of Eogent and even older strata. Seismic refraction profiles show that there are Eogene and Mesozoic velocity layers with longitudinal velocities of 4.7 - 5.3 km/s... |
| Tipo: Journal Contribution |
Palavras-chave: Oceanographic institutions. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/5873 |
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| Fang, Yinxia; Chu, Fengyou. |
| The sulfate-methane interface is an important biogeochemical identification interface for the areas with high methane flux and containing gas hydrate. Above the sulfate-methane interface, the sulfate concentration in the sediment is consumed progressively for the decomposition of the organic matter and anaerobic methane oxidation. Below the sulfate-methane interface, the methane concentration increases continuously with the depth. Based on the variation characters of the sulfate and methane concentration around the sulfate-methane interface, it is feasible to estimate the intensity of the methane flux, and thereafter to infer the possible occurrence of gas hydrate. The geochemical data of the pore water taken from the northern slope of the South China Sea... |
| Tipo: Journal Contribution |
Palavras-chave: Gas hydrates; Methane; Interfaces; Sulfates. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/5880 |
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