Geology and genesis of the Ta'ergou skarn quartz vein tungsten deposit;in the North Qilian Caledonian orogenic belt, northwest China

doi:10.1111/j.1751-3928.2003.tb00162.x

CORC > 中国地质调查局 > 中国地质调查局 > 中国地质科学院矿产资源研究所

	Geology and genesis of the Ta'ergou skarn quartz vein tungsten deposit;in the North Qilian Caledonian orogenic belt, northwest China
	Zhang, ZH 3; Mao, JW ; Yang, JM ; Wang, ZL ; Zhang, ZC
刊名	RESOURCE GEOLOGY
	2003
卷号	53 期号:2 页码:101-114
关键词	Yeniutan intrusion Ta'ergou skarn deposit wolframite tungsten deposit fluid inclusion stable isotope North Qilian Caledonian orogenic belt
ISSN号	1344-1698
DOI	10.1111/j.1751-3928.2003.tb00162.x
英文摘要	The Ta'ergou tungsten deposit in Gansu province, northwestern China, is located in the western part of the North Qilian Caledonian orogen, and consists of scheelite skarn bodies and wolframite quartz veins. The tungsten-bearing skam developed by the replacement of carbonate layers intercalated in the Precambrian schist and amphibolite whereas wolframite-quartz ore veins developed along a group of fractures that cut through horizontal skarns. The Ta'ergou tungsten deposit is genetically related to the Caledonian Yeniutan granodiorite intrusion and occurs ca. 500 in wide in the exo-contact zone 300 similar to 500 in apart from the intrusion. The granodiorite displays a lower grade of differentiation, low content of SiO2 and high contents of mafic components.;There are three types of fluid inclusions in the wolframite-quartz vein systems, i.e. aqueous, CO2-H2O and CO2-rich. The homogenization temperature of aqueous inclusion ranges from 140 to 380degreesC and their salinities from 6.4 to 17.4 equivalent wt% NaCl. Laser Raman spectroscopy shows that the inclusions contain a relatively high content of CO2. The delta(34)S values of skarn type sulfides range from +8.1 to +12.7 per mil and those of quartz vein sulfides from +93 to + 14.9 per mil, similar to sulfides of the granodiorite with from +6.0 to +11.7 per mil. The delta(18)O values of quartz are between +10.5 and +13.3 per mil and those of wolframite between +3.4 and +5.1 per mil. The delta(18)O water values of ore forming fluids range from +0.6 to +6.4 per mil and suggest the mixture of magmatic fluids with meteoric water formed the ore-forming fluids.;It has been proved that Precambrian strata in the west sector of North Qilian region are enriched in tungsten. We propose the strata were remelted to be tungsten-granitoid during subduction. The polymetallic tungsten was gradually accumulated into the roof pendants of the granite intrusion by fractional crystallization and then was deposited by hydrothermal fluids during metasomatism and infilling along fractures. On the other hand, the granite intrusion also acted as "heating machine" to make hydrothermal fluids leach out the metals from Precambrian strata and these metals joined the ore-forming hydrothermal system.
学科主题	矿床地质
WOS关键词	FLU##ID#INCLUSIONS ; STABLE ISOTOPE ; BEARING SKARNS ; SIERRA-NEVADA ; ORE-DEPOSITS ; WEST SECTOR ; MOUNTAINS ; MINE ; MINERALIZATION ; GEOCHEMISTRY
WOS研究方向	Geology ; Mineralogy
语种	英语
出版者	SOC RESOURCE GEOLOGY
WOS记录号	WOS:000184605800003
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37572]
专题	中国地质科学院矿产资源研究所
作者单位	1.Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China. 2.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 3.中国地质科学院矿产资源研究所
推荐引用方式 GB/T 7714	Zhang, ZH,Mao, JW,Yang, JM,et al. Geology and genesis of the Ta'ergou skarn quartz vein tungsten deposit;in the North Qilian Caledonian orogenic belt, northwest China[J]. RESOURCE GEOLOGY,2003,53(2):101-114.
APA	Zhang, ZH,Mao, JW,Yang, JM,Wang, ZL,&Zhang, ZC.(2003).Geology and genesis of the Ta'ergou skarn quartz vein tungsten deposit;in the North Qilian Caledonian orogenic belt, northwest China.RESOURCE GEOLOGY,53(2),101-114.
MLA	Zhang, ZH,et al."Geology and genesis of the Ta'ergou skarn quartz vein tungsten deposit;in the North Qilian Caledonian orogenic belt, northwest China".RESOURCE GEOLOGY 53.2(2003):101-114.