Biogenic and petroleum-related ore-forming processes in Dongsheng uranium deposit, NW China

doi:10.1016/j.oregeorev.2006.05.003

	Biogenic and petroleum-related ore-forming processes in Dongsheng uranium deposit, NW China
	Cai, Chunfang ; Li, Hongtao ; Qin, Mingkuan ; Luo, Xiaorong ; Wang, Feiyu ; Ou, Guangxi
刊名	ORE GEOLOGY REVIEWS
	2007-09-01
卷号	32 期号:1-2 页码:262-274
关键词	bacterial sulfate reduction petroleum delta C-13 delta S-34 uranium Dongsheng China
ISSN号	0169-1368
DOI	10.1016/j.oregeorev.2006.05.003
文献子类	Review
英文摘要	Sandstone-hosted roll-type U deposits has recently been found in the Middle Jurassic Zhiluo Formation in the Dongsheng area, north of the Ordos Basin. In order to assess the origin of the uranium mineralization, the host sandstone has been investigated, with emphasis on delta S-34 values of ore-stage pyrite, delta C-13 of calcite, fluid inclusion oil biomarkers, X-ray diffraction, ICP-MS, as well as studies by electron microprobe and scanning electron microscope. The mineralization consists mainly of coffinite. Some of the coffinite is intimately intergrown with ore-stage pyrite, indicating co-precipitation. Ore-stage pyrite has delta S-34 values from - 34 to + 17%o, suggesting the pyrite sulfur originated from bacterial sulfate reduction. In the host sandstone, calcite cement exhibits delta C-13 values from - 27.6 to - 2.1%o and fluid inclusion oils show evidence of biodegradation. These lines of evidence indicate petroleum was likely oxidized by sulfate-reducing bacteria (SRB) and thus supplied a source of some of the carbon in the calcite. Microbial degradation of petroleum is partially supported by the low-temperature diagenetic environment (< 70 degrees C). Thus, SRB were likely to reduce sulfates to sulfides simultaneously with petroleum oxidization, and caused direct or indirect reduction of hexavalent uranium [U(VI)] to tetravalent uranium [U(IV)]. U(VI) pre-concentration by adsorption and subsequent inorganic reduction is likely to be less significant than direct reduction of U(VI) by SRB in the Dongsbeng deposit. This is because ore-stage solution is non-acidic (pH = 8 to 10), as indicated by abundance of ore-stage pyrite and calcite cement and lack of marcasite in the host sandstone. (c) 2006 Elsevier B.V All rights reserved.
WOS关键词	THERMOCHEMICAL SULFATE REDUCTION ; ORDOVICIAN CARBONATES ; ANAEROBIC OXIDATION ; REDUCING BACTERIA ; SEDIMENTARY-ROCKS ; ISOTOPIC EVIDENCE ; TARIM BASIN ; ORIGIN ; WATER ; COFFINITE
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000249859200010
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/67934]
专题	中国科学院地质与地球物理研究所
通讯作者	Cai, Chunfang
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Beijing Res Inst Uranium Geol, Beijing 100029, Peoples R China 3.Petr Univ, Inst Resource & Informat, Beijing 102249, Peoples R China
推荐引用方式 GB/T 7714	Cai, Chunfang,Li, Hongtao,Qin, Mingkuan,et al. Biogenic and petroleum-related ore-forming processes in Dongsheng uranium deposit, NW China[J]. ORE GEOLOGY REVIEWS,2007,32(1-2):262-274.
APA	Cai, Chunfang,Li, Hongtao,Qin, Mingkuan,Luo, Xiaorong,Wang, Feiyu,&Ou, Guangxi.(2007).Biogenic and petroleum-related ore-forming processes in Dongsheng uranium deposit, NW China.ORE GEOLOGY REVIEWS,32(1-2),262-274.
MLA	Cai, Chunfang,et al."Biogenic and petroleum-related ore-forming processes in Dongsheng uranium deposit, NW China".ORE GEOLOGY REVIEWS 32.1-2(2007):262-274.