Xie Lei1; Wang Jiasheng1; Wu Nengyou2; Wu Daidai2; Wang Zhou1; Zhu Xiaowei3; Hu Jun1; Chen Hongren1; Lin Qi1
Source Publicationsciencechinaearthsciences
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 41.69‰ to 49.16‰. 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.
Document Type期刊论文
Affiliation1.Faculty of Earth Science, China University of Geosciences
Recommended Citation
GB/T 7714
Xie Lei,Wang Jiasheng,Wu Nengyou,et al. characteristicsofauthigenicpyritesinshallowcoresedimentsintheshenhuareaofthenorthernsouthchinaseaimplicationsforapossiblemudvolcanoenvironment[J]. sciencechinaearthsciences,2013,56(4):541.
APA Xie Lei.,Wang Jiasheng.,Wu Nengyou.,Wu Daidai.,Wang Zhou.,...&Lin Qi.(2013).characteristicsofauthigenicpyritesinshallowcoresedimentsintheshenhuareaofthenorthernsouthchinaseaimplicationsforapossiblemudvolcanoenvironment.sciencechinaearthsciences,56(4),541.
MLA Xie Lei,et al."characteristicsofauthigenicpyritesinshallowcoresedimentsintheshenhuareaofthenorthernsouthchinaseaimplicationsforapossiblemudvolcanoenvironment".sciencechinaearthsciences 56.4(2013):541.
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