南海北部神狐海域水合物钻探区沉积物地球化学特征

doi:10.16562/j.cnki.0256-1492.2017.06.011

GIEC OpenIR > 中国科学院广州能源研究所

	南海北部神狐海域水合物钻探区沉积物地球化学特征
其他题名	GEOCHEMISTRY OF THE SEDIMENTS IN SHENHU HYDRATE DRILLING AREA,NORTHERN SOUTH CHINA SEA
	邬黛黛1,2 ; 谢瑞 1,3; 杨睿1 ; 孙甜甜 1; 杨飞 1,3; 刘丽华 1; 吴能友2,4
	2017-12
发表期刊	海洋地质与第四纪地质
ISSN	0256-1492
卷号	37 期号:6 页码:100-109
摘要	海底水合物形成分解/甲烷渗漏的甲烷以及相关的生物地球化学过程可能对海底的沉积环境产生影响,因此识别水合物的形成分解/甲烷渗漏对海洋沉积环境改造有助于了解水合物成藏特征及其形成分解过程。选取南海北部神狐海域2007年水合物钻探区的SH3钻孔沉积物为研究对象,对SH3钻孔岩心的碳硫数据、主微量元素,尤其是氧化还原敏感元素(U、Mo、U/Mo、V/Sr)进行分析测试,同时结合SH3钻孔孔隙水数据和前人对神狐水合物钻探区的研究成果等进行对比研究。结果表明南海北部神狐海域沉积物来源除河流沉积物以外,同时还有少量中国黄土以及大陆岛弧的长英质岩浆岩沉积物；通过对U、Mo、U/Mo以及碳硫数据分析,发现SH3钻孔在10~25mbsf(meter below the seafloor)层位为硫酸盐驱动的甲烷厌氧氧化作用(Anaerobic oxidation of methane,AOM)造成的还原沉积环境,AOM作用导致了在这一层位发生了LREE/HREE、MREE/HREE的分馏；SH3钻孔沉积物在约180~215mbsf的含水合物层位出现了浊流沉积的次氧化的沉积环境,同时其赋存的细粒沉积环境也导致了轻重稀土元素的分馏,与水合物饱和度存在一定的相关性。
其他摘要	The formation and decomposition of gas hydrate as well as the methane leakage caused by associated biogeochemical processes may change the depositional environment of the seabed.To identify the decomposition of hydrate as well as the change in marine environment caused by the seeping methane will contribute to the understanding of the processes of hydrate formation and decomposition.In this paper,we selected the Core SH3 as a case from the Shenhu hydrate drilling area in the northern part of South China Sea to study the formation and deterioration of hydrate.Carbon and sulfur contents,main and trace elements,especially redox sensitive elements are measured.Data from pore water and previous researches are also studied.The study suggests that the sediments of the Shenhu area are mainly sourced from a fluvial origin with a little of loess and felsic igneous materials.From the data of U,Mo contents and U/Mo ratio,as well as carbon and sulfur contents,it is inferred that the layers at 10~25 mbsf in the core of SH3 is mainly formed in a reduced depositional environment,resulted from sulfate reduction by the anaerobic oxidation of methane.The change in redox condition of depositional environment may lead to the fractionation of LREE/HREE and MREE/HREE in the layers.In the SH3 core sediment,there is a sub-oxidized depositional environment at the level of about 180~215 mbsf.It is supposed to be caused by the deposition of turbidites.The depositional environment of fine-grained sediments,at the same time,also leads to the fractionation of light and heavy rare earth elements.To sum up,we have succeeded in revealing material source,environment change in the Shenhu area and the specific role of hydrate-sedimentary environment in this paper and the results are very useful for understanding of the origin of gas hydrate.
关键词	水合物钻探区天然气水合物沉积环境神狐海域 the Shenhu area hydrate drilling area gas hydrate sedimentary environment
DOI	10.16562/j.cnki.0256-1492.2017.06.011
语种	中文
引用统计
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/16637
专题	中国科学院广州能源研究所
通讯作者	谢瑞
作者单位	1.中国科学院天然气水合物重点实验室，中国科学院广州能源研究所，广州510640; 2.青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室，青岛266071; 3.中国科学院大学，北京100049; 4.国土资源部天然气水合物重点实验室，青岛海洋地质研究所，青岛266071
第一作者单位	天然气水合物
推荐引用方式 GB/T 7714	邬黛黛,谢瑞,杨睿,等. 南海北部神狐海域水合物钻探区沉积物地球化学特征[J]. 海洋地质与第四纪地质,2017,37(6):100-109.
APA	邬黛黛.,谢瑞.,杨睿.,孙甜甜.,杨飞.,...&吴能友.(2017).南海北部神狐海域水合物钻探区沉积物地球化学特征.海洋地质与第四纪地质,37(6),100-109.
MLA	邬黛黛,et al."南海北部神狐海域水合物钻探区沉积物地球化学特征".海洋地质与第四纪地质 37.6(2017):100-109.

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