IOCAS-IR  > 海洋地质与环境重点实验室
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
Source PublicationGEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
Volume18Issue:10Pages:3700-3713
SubtypeArticle
AbstractGas 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.
KeywordGas Hydrate In Situ Raman Spectroscopy Free Gas The South China Sea Deep Sea
DOI10.1002/2017GC006987
Indexed BySCI
Language英语
WOS IDWOS:000415368100010
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/143040
Collection海洋地质与环境重点实验室
Affiliation1.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
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences;  Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res
Recommended Citation
GB/T 7714
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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