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Morphology and formation mechanism of pyrite induced by the anaerobic oxidation of methane from the continental slope of the NE South China Sea
Zhang, Mei1,2,3; Konishi, Hiromi2; Xu, Huifang2; Sun, Xiaoming3,4,5; Lu, Hongfeng6; Wu, Daidai1; Wu, Nengyou1
2014-10-01
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
Volume92Pages:293-301
AbstractIn order to understand the response of authigenic pyrite to gas hydrate geo-systems, pyrite tubes or rods at the sulfate methane transition (SMT) zone of cord GC10 from the northern continental slope of the South China Sea (SCS) were investigated. In situ X-ray diffraction (XRD) results show that the pyrite tube consists of pyrite micro-crystals with trace amount of graphite in the inner tube. Scanning electron microscope (SEM) observations of pyrite tubes indicate various aggregations in the form of framboidal, euhedral, and colloidal pyrite microcrystals. Typical framboidal pyrite is considered as packing of octahedral microcrystals. Interestingly, many framboids in the tubes consist of round or irregular microcrystals and have an outer crust that consists of secondary pyrite. The size of the framboids in the inner wall of the tube is larger than that in the middle wall or foraminifer-filled pyrite. High-resolution transmission electron microscopic (HRTEM) images show marcasite lamellae defects in the spherulitic pyrite crystals, which reveal different solution conditions during the pyrite precipitation. Nano-foil-like graphitic carbon was observed to be closely associated with the pyrite spherules. The occurrence of both marcasite layers and nano-foil-like graphitic carbon suggest that the migration of methane from deep sediment. It is suggested that the formation of pyrite serves as a catalyst during the reaction from methane to elemental carbon under the anaerobic oxidation of methane. Meanwhile, this reaction results in local acidification of the solution inside the pyrite tubes, which favors marcasite lamellae growth on the host pyrite substrate. (C) 2014 Elsevier Ltd. All rights reserved.
SubtypeArticle
KeywordPyrite Marcasite Spherule Framboid Anaerobic Oxidation Of Methane Aom South China Sea
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.jseaes.2014.05.004
WOS Subject ExtendedGeology
WOS KeywordGULF-OF-MEXICO ; SULFIDE MINERAL FORMATION ; GAS HYDRATE OCCURRENCE ; SULFATE REDUCTION ; SEEP CARBONATES ; AUTHIGENIC CARBONATES ; FRAMBOIDAL PYRITE ; MARINE-SEDIMENTS ; REDOX CONDITIONS ; BARITE DEPOSITS
Indexed BySCI
Language英语
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000341554100021
Citation statistics
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/10635
Collection中国科学院广州能源研究所
Affiliation1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China
2.Univ Wisconsin, NASA, Astrobiol Inst, Dept Geosci, Madison, WI 53706 USA
3.Sun Yat Sen Univ, Sch Earth Sci & Geol Engn, Guangzhou 510275, Guangdong, Peoples R China
4.Sun Yat Sen Univ, Sch Marine Sci, Guangzhou 510006, Guangdong, Peoples R China
5.Key Lab Marine Resources & Coastal Engn Guangdong, Guangzhou 510275, Guangdong, Peoples R China
6.Guangzhou Marine Geol Survey, Guangzhou 510760, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Mei,Konishi, Hiromi,Xu, Huifang,et al. Morphology and formation mechanism of pyrite induced by the anaerobic oxidation of methane from the continental slope of the NE South China Sea[J]. JOURNAL OF ASIAN EARTH SCIENCES,2014,92:293-301.
APA Zhang, Mei.,Konishi, Hiromi.,Xu, Huifang.,Sun, Xiaoming.,Lu, Hongfeng.,...&Wu, Nengyou.(2014).Morphology and formation mechanism of pyrite induced by the anaerobic oxidation of methane from the continental slope of the NE South China Sea.JOURNAL OF ASIAN EARTH SCIENCES,92,293-301.
MLA Zhang, Mei,et al."Morphology and formation mechanism of pyrite induced by the anaerobic oxidation of methane from the continental slope of the NE South China Sea".JOURNAL OF ASIAN EARTH SCIENCES 92(2014):293-301.
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