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Gas Hydrate Occurrence Inferred from Dissolved Cl- Concentrations and delta O-18 Values of Pore Water and Dissolved Sulfate in the Shallow Sediments of the Pockmark Field in Southwestern Xisha Uplift, Northern South China Sea
Luo, M; Chen, LY; Tong, HP; Yan, W; Chen, DF; luomin@gig.ac.cn; cly2812@hotmail.com; tonghp@scsio.ac.cn; wyan@scsio.ac.cn; cdf@gig.ac.cn
2014
发表期刊ENERGIES
ISSN1996-1073
卷号7期号:6页码:3886-3899
摘要Deep-water pockmarks are frequently accompanied by the occurrence of massive gas hydrates in shallow sediments. A decline in pore-water Cl-concentration and rise in delta O-18 value provide compelling evidence for the gas hydrate dissociation. Mega-pockmarks are widely scattered in the southwestern Xisha Uplift, northern South China Sea (SCS). Pore water collected from a gravity-core inside of a mega-pockmark exhibits a downward Cl-concentration decrease concomitant with an increase in delta O-18 value at the interval of 5.7-6.7 mbsf. Concentrations of Cl-, Na+, and K+ mainly cluster along the seawater freshening line without distinct Na+ enrichment and K+ depletion. Thus, we infer that the pore water anomalies of Cl-concentrations and delta(18)ZO values are attributed to gas hydrate dissociation instead of clay mineral dehydration. Moreover, the lower delta O-18 values of sulfate in the target core (C14) than those in the reference core (C9) may be associated with the equilibrium oxygen fractionation during sulfate reduction between sulfate and the relatively O-18-depleted ambient water resulting from gas hydrate formation. The gas hydrate contents are estimated to be 6%-10% and 7%-15%, respectively, according to the offset of Cl-concentrations and delta O-18 values from the baselines. This pockmark field in southwestern Xisha Uplift is likely to be a good prospective area for the occurrence of gas hydrate in shallow sediments.
部门归属[Luo, Min ; Chen, Duofu] Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Marginal Sea Geol, Guangzhou 510640, Guangdong, Peoples R China ; [Luo, Min] Univ Chinese Acad Sci, Beijing 100049, Peoples R China ; [Chen, Linying ; Tong, Hongpeng ; Yan, Wen ; Chen, Duofu] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
关键词Gas Hydrate Pore Water Chloride Delta O-18 Southwestern Xisha Uplift
学科领域Energy & Fuels
资助者NSFC [91228206, 41306044]; GIGCAS 135 Project [Y234021001] ; NSFC [91228206, 41306044]; GIGCAS 135 Project [Y234021001] ; NSFC [91228206, 41306044]; GIGCAS 135 Project [Y234021001] ; NSFC [91228206, 41306044]; GIGCAS 135 Project [Y234021001]
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收录类别sci
资助项目海洋地质
资助者NSFC [91228206, 41306044]; GIGCAS 135 Project [Y234021001] ; NSFC [91228206, 41306044]; GIGCAS 135 Project [Y234021001] ; NSFC [91228206, 41306044]; GIGCAS 135 Project [Y234021001] ; NSFC [91228206, 41306044]; GIGCAS 135 Project [Y234021001]
WOS记录号WOS:000338557600023
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被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/10621
专题中科院边缘海地质重点实验室
通讯作者luomin@gig.ac.cn; cly2812@hotmail.com; tonghp@scsio.ac.cn; wyan@scsio.ac.cn; cdf@gig.ac.cn
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GB/T 7714
Luo, M,Chen, LY,Tong, HP,et al. Gas Hydrate Occurrence Inferred from Dissolved Cl- Concentrations and delta O-18 Values of Pore Water and Dissolved Sulfate in the Shallow Sediments of the Pockmark Field in Southwestern Xisha Uplift, Northern South China Sea[J]. ENERGIES,2014,7(6):3886-3899.
APA Luo, M.,Chen, LY.,Tong, HP.,Yan, W.,Chen, DF.,...&cdf@gig.ac.cn.(2014).Gas Hydrate Occurrence Inferred from Dissolved Cl- Concentrations and delta O-18 Values of Pore Water and Dissolved Sulfate in the Shallow Sediments of the Pockmark Field in Southwestern Xisha Uplift, Northern South China Sea.ENERGIES,7(6),3886-3899.
MLA Luo, M,et al."Gas Hydrate Occurrence Inferred from Dissolved Cl- Concentrations and delta O-18 Values of Pore Water and Dissolved Sulfate in the Shallow Sediments of the Pockmark Field in Southwestern Xisha Uplift, Northern South China Sea".ENERGIES 7.6(2014):3886-3899.
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