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Characteristics of authigenic pyrites in shallow core sediments in the Shenhu area of the northern South China Sea: Implications for a possible mud volcano environment
Xie Lei1,2; Wang JiaSheng1,2; Wu NengYou3,4; Wu DaiDai3,4; Wang Zhou2; Zhu XiaoWei4,5; Hu Jun2; Chen HongRen2; Lin Qi2
2013-04-01
Source PublicationSCIENCE CHINA-EARTH SCIENCES
Volume56Issue:4Pages:541-548
AbstractDistinct pyrites have been recovered from a shallow sediment core from Site 4B in the Shenhu area of the northern South China Sea. Based on the lithology, texture and structure of sediments, the stable sulfur isotope of pyrite and the total organic carbon (TOC) concentration of the sediments, a distinctive sediment interface is identified at a depth of about 1 m below the seafloor in the core sediments. The pyrites only accumulate in the lower part of the core as rods and foraminifera-infillings, and mainly within three intervals marked by high pyrite concentrations. The amount of pyrite in the sediments shows no remarkable correlation with TOC in the Site 4B core sediments. The stable sulfur isotopes of the pyrite have extremely negative values ranging from -41.69aEuro degrees to -49.16aEuro degrees. They are considered to be the mutual product of sulfate bacterial reduction and sulfur bacterial disproportionation. Our research proposes that Site 4B might be located in or near a possible mud volcano sedimentary environment; a large amount of methane could migrate from deep to shallow sediments in an active mud volcano and thereby play a key role in the intensity of sulfate bacterial reduction and the amount of pyrite formed at Site 4B. Further, the variation in flux of deep methane fluid by intermittent mud volcanic eruptions might result in the deposition of authigenic pyrite intervals.
SubtypeArticle
KeywordPyrite Distribution Sulfur Isotope Shallow Sediment Shenhu Area
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1007/s11430-012-4511-3
WOS Subject ExtendedGeology
WOS KeywordGAS HYDRATE ; ISOTOPE FRACTIONATION ; SULFATE REDUCTION ; MARINE-SEDIMENTS ; SULFUR ISOTOPES ; SULFIDE
Indexed BySCI
Language英语
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000317347200004
Citation statistics
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/10122
Collection中国科学院广州能源研究所
Affiliation1.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China
2.China Univ Geosci, Fac Earth Sci, Wuhan 430074, Peoples R China
3.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China
4.Chinese Acad Sci, Guangzhou Ctr Gas Hydrate Res, Guangzhou 510640, Peoples R China
5.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China
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Xie Lei,Wang JiaSheng,Wu NengYou,et al. Characteristics of authigenic pyrites in shallow core sediments in the Shenhu area of the northern South China Sea: Implications for a possible mud volcano environment[J]. SCIENCE CHINA-EARTH SCIENCES,2013,56(4):541-548.
APA Xie Lei.,Wang JiaSheng.,Wu NengYou.,Wu DaiDai.,Wang Zhou.,...&Lin Qi.(2013).Characteristics of authigenic pyrites in shallow core sediments in the Shenhu area of the northern South China Sea: Implications for a possible mud volcano environment.SCIENCE CHINA-EARTH SCIENCES,56(4),541-548.
MLA Xie Lei,et al."Characteristics of authigenic pyrites in shallow core sediments in the Shenhu area of the northern South China Sea: Implications for a possible mud volcano environment".SCIENCE CHINA-EARTH SCIENCES 56.4(2013):541-548.
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