China&apos;s First Independent Cobalt Deposit and its Metallogenic Mechanism:   Evidence from Fluid Inclusions and Isotopic Geochemistry

doi:10.1111/j.1755-6724.2011.00595.x

CORC > 北京大学 > 地球与空间科学学院

	China's First Independent Cobalt Deposit and its Metallogenic Mechanism: Evidence from Fluid Inclusions and Isotopic Geochemistry
	Feng Chengyou ; Qi Feng ; Zhang Dequan ; Li Daxin ; She Hongquan
刊名	acta geologica sinica english edition
	2011
关键词	cobalt deposit fluid inclusion isotopic geochemistry SEDEX metallogenic mechanism Tuolugou in Qinghai Province eastern Kunlun orogenic belt BELT AU
DOI	10.1111/j.1755-6724.2011.00595.x
英文摘要	The Tuolugou cobalt deposit is the first independent large-scale Co- and Au-bearing deposit discovered in northwestern China. It is located in the eastern Kunlun orogenic belt in Qinghai Province, and occurs conformably in low-grade metamorphic volcano-sedimentary rock series with well-developed Na-rich hydrothermal sedimentary rocks and typical hydrothermal sedimentary ore fabrics. Fluid inclusions and isotopic geochemistry studies suggest that cobalt mineralizing fluid is dominated by NaCl-H(2)O system, accompanied by NaCl-CO(2)-H(2)O-N(2) system responsible for gold mineralization. Massive, banded and disseminated pyrite ores have similar compositions of He and Ar isotopes from the mineralizing fluid, with (3)He/(4)He range between 0.10 to 0.31Ra (averaging 0.21Ra), and (40)Ar/(36)Ar between 302 and 569 (averaging 373), which reflects that Co mineralizing fluids derived dominantly from meteoric water deeply circulating. delta(34)S values of pyrite approaches to zero (delta(34)S ranging from -4.5 parts per thousand to +1.5 parts per thousand, centering around -1.8 parts per thousand to -0.2 parts per thousand), reflecting its deep source. Ore lead is characterized by distinctly high radiogenesis, with (206)Pb/(204)Pb>19.279, (207)Pb/(204)Pb>15.691 and (208)Pb/(204)Pb>39.627, and its values show an increase trend from country rocks, regional Paleozoic volcanic rocks to ores. This may have suggested that high radiogentic ore Pb derived mainly from country rocks by leaching meteoric water-dominated hydrothermal fluid during its circulation at depth. Cobalt occurs mainly in sulfide phase (such as pyrite), but cobalt enrichment, and presence and increasing contents of Co-bearing minerals have a positive correlation with metamorphic degree. The Tuolugou deposit and other typical strata-bound Co-Cu-Au deposits have striking similarities in the geological features and metallogenic pattern of primary cobalt All of them are syngenetic hydrothermal exhalative sedimentation in origin.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000298536400015&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Geosciences, Multidisciplinary; SCI(E); 中国科学引文数据库(CSCD); 1; ARTICLE; 6; 1403-1418; 85
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155753]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Feng Chengyou,Qi Feng,Zhang Dequan,et al. China's First Independent Cobalt Deposit and its Metallogenic Mechanism: Evidence from Fluid Inclusions and Isotopic Geochemistry[J]. acta geologica sinica english edition,2011.
APA	Feng Chengyou,Qi Feng,Zhang Dequan,Li Daxin,&She Hongquan.(2011).China's First Independent Cobalt Deposit and its Metallogenic Mechanism: Evidence from Fluid Inclusions and Isotopic Geochemistry.acta geologica sinica english edition.
MLA	Feng Chengyou,et al."China's First Independent Cobalt Deposit and its Metallogenic Mechanism: Evidence from Fluid Inclusions and Isotopic Geochemistry".acta geologica sinica english edition (2011).