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	Fluid inclusion geochemistry and genetic type of the yangshan gold deposit, gansu, china
	Li Jing; Chen YanJing; Li QiangZhi; Lai Yong; Yang RongSheng; Mao ShiDong
刊名	Acta petrologica sinica
	2007-09-01
卷号	23期号:9页码:2144-2154
关键词	Yangshan gold deposit Yangshan-type gold deposit Fluid inclusion Ore-fluid Qinling orogen
ISSN号	1000-0569
通讯作者	Li jing(crystalheibao@sohu.com)
英文摘要	The yangshan gold deposit, gansu province, is the china's largest gold deposit recently found in the western qinling orogen. it is controlled by an e-trending shear zone and hosted in the devonian carbonaceous carbonate-phyllite-slate sequence and the granite-porphyry dikes intruding into the devonian strata. its hydrothermal ore-forming process includes several stages: (1) the early stage forming quartz-sericite-pyrite assemblage; (2) the main stage forming from early to late quartz-pyrite-arsenide, quartz-arsenide-pyrite and quartz-carbonate-stibnite-native gold assemblages, respectively; and (3) the late stage forming carbonate-quartz veinlets. a comprehensive study, including microthermometry and compositional analysis using laser raman spectrometry for single fluid inclusion and quardrupole mass spectrometer for bulk fluid inclusions, shows that the early stage fluid inclusions are co(2)-bearing, with co, contents ranging 7. 3% similar to 21. 5mol%, homogenization temperatures clustering 270 degrees c similar to 300 degrees c, and the salinities lower than 3 wt. % nacl eqv. the main stage fluid inclusions are dominated by pure co,, h(2)o-solution and minor of co(2) -bearing in compositions, with homogenization temperatures clustering 210 degrees c similar to 270 degrees c, and the salinities clustering in two spans of < 2 and 3 similar to 5 wt. % nacl eqv. all the late stage fluid inclusions are h(2)o-solution with homogenization temperatures between 160 degrees c similar to 210 degrees c and salinities lower than 3 wt. % nacl eqv. fluid boiling in the main stage are evidenced by the co-existence of three types of fluid inclusions with similar homogenization temperatures, and by bimodality of the salinities clustering in two spans of <2 and 3 similar to 5 wt. % nacl eqv, respectively. fluid inclusions of main stage were trapped at temperatures of 210 degrees c similar to 375 degrees c and pressures of 85 similar to 222mpa. fault-valve activity resulted in a fluid-system with alternating lithostatic-hydrostatic pressures at the depths of about 8. 5km. the ore-forming fluid-system developed during early jurassic continental collision orogenesis. orebodies of the yangshan gold deposit are geologically similar to the carlin-type, with exception of those hosted in granite-porphyry dikes, which are not similar to the orogenic-type either. the ore-forming fluid-system of the yangshan deposit is same to the orogenic-type. hence the yangshan gold deposit possibly represents a new type of gold deposits called as "yangshan type" in this paper.
WOS关键词	PROVINCE ; CONSTRAINTS ; EVOLUTION
WOS研究方向	Geology
WOS类目	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000251471600013
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2380193
专题	中国科学院大学
通讯作者	Li Jing
作者单位	1.Chinese Acad Sci, Guangzhou Inst Geochem, KLMD, Guangzhou 510640, Peoples R China 2.Peking Univ, Key Lab Orogen & Crust Evolut, Beijing 100871, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China 4.Headquarter Gold Explorat Branch Armed Police, Beijing 100102, Peoples R China
推荐引用方式 GB/T 7714	Li Jing,Chen YanJing,Li QiangZhi,et al. Fluid inclusion geochemistry and genetic type of the yangshan gold deposit, gansu, china[J]. Acta petrologica sinica,2007,23(9):2144-2154.
APA	Li Jing,Chen YanJing,Li QiangZhi,Lai Yong,Yang RongSheng,&Mao ShiDong.(2007).Fluid inclusion geochemistry and genetic type of the yangshan gold deposit, gansu, china.Acta petrologica sinica,23(9),2144-2154.
MLA	Li Jing,et al."Fluid inclusion geochemistry and genetic type of the yangshan gold deposit, gansu, china".Acta petrologica sinica 23.9(2007):2144-2154.

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