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In Situ Raman Detection of Gas Hydrates Exposed on the Seafloor of the South China Sea
Zhang, Xin1,2,3; Du, Zengfeng1,3; Luan, Zhendong1,3; Wang, Xiujuan1; Xi, Shichuan1; Wang, Bing1; Li, Lianfu1; Lian, Chao3; Yan, Jun1
2017-10-01
发表期刊GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
卷号18期号:10页码:3700-3713
文章类型Article
摘要Gas hydrates are usually buried in sediments. Here we report the first discovery of gas hydrates exposed on the seafloor of the South China Sea. The in situ chemical compositions and cage structures of these hydrates were measured at the depth of 1,130 m below sea level using a Raman insertion probe (RiP-Gh) that was carried and controlled by a remotely operated vehicle (ROV) Faxian. This in situ analytical technique can avoid the physical and chemical changes associated with the transport of samples from the deep sea to the surface. Natural gas hydrate samples were analyzed at two sites. The in situ spectra suggest that the newly formed hydrate was Structure I but contains a small amount of C3H8 and H2S. Pure gas spectra of CH4, C3H8, and H2S were also observed at the SCS-SGH02 site. These data represent the first in situ proof that free gas can be trapped within the hydrate fabric during rapid hydrate formation. We provide the first in situ confirmation of the hydrate growth model for the early stages of formation of crystalline hydrates in a methane-rich seafloor environment. Our work demonstrates that natural hydrate deposits, particularly those in the early stages of formation, are not monolithic single structures but instead exhibit significant small-scale heterogeneities due to inclusions of free gas and the surrounding seawater, there inclusions also serve as indicators of the likely hydrate formation mechanism. These data also reinforce the importance of correlating visual and in situ measurements when characterizing a sampling site.
关键词Gas Hydrate In Situ Raman Spectroscopy Free Gas The South China Sea Deep Sea
DOI10.1002/2017GC006987
收录类别SCI
语种英语
WOS记录号WOS:000415368100010
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被引频次:5[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/143040
专题海洋地质与环境重点实验室
作者单位1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China
3.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao, Peoples R China
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Zhang, Xin,Du, Zengfeng,Luan, Zhendong,et al. In Situ Raman Detection of Gas Hydrates Exposed on the Seafloor of the South China Sea[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2017,18(10):3700-3713.
APA Zhang, Xin.,Du, Zengfeng.,Luan, Zhendong.,Wang, Xiujuan.,Xi, Shichuan.,...&Yan, Jun.(2017).In Situ Raman Detection of Gas Hydrates Exposed on the Seafloor of the South China Sea.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,18(10),3700-3713.
MLA Zhang, Xin,et al."In Situ Raman Detection of Gas Hydrates Exposed on the Seafloor of the South China Sea".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 18.10(2017):3700-3713.
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