Formation of the Dongmozhazhua Pb-Zn Deposit in the Thrust-Fold Setting of the Tibetan Plateau, China Evidence from Fluid Inclusion and Stable Isotope Data

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	Formation of the Dongmozhazhua Pb-Zn Deposit in the Thrust-Fold Setting of the Tibetan Plateau, China Evidence from Fluid Inclusion and Stable Isotope Data
	Liu, YC (Liu, YingChao); Hou, ZQ (Hou, ZengQian); Yang, ZS (Yang, ZhuSen); Tian, SH (Tian, ShiHong); Yang, TN (Yang, TianNan); Song, YC (Song, YuCai); Zhang, HR (Zhang, HongRui); Carranza, EJM (Carranza, Emmanuel John M.)
刊名	RESOURCE GEOLOGY
	2011
卷号	61 期号:4 页码:384-406
关键词	carbonate-hosted Pb-Zn deposit collisional orogen fluid inclusions stable isotopes thrust-fold belt Tibetan plateau
ISSN号	1344-1698
英文摘要	The Dongmozhazhua deposit, the largest Pb-Zn deposit in south Qinghai, China, is stratabound, carbonate-hosted and associated with epigenetic dolomitization and silicification of Lower-Middle Permian-Upper Triassic limestones in the hanging walls of a Cenozoic thrust fault system. The mineralization is localized in a Cenozoic thrust-folded belt along the northeastern edge of the Tibetan plateau, which was formed due to the India-Asia plate collision during the early Tertiary. The deposit comprises 16 orebodies with variable thicknesses (1.5-26.3 m) and lengths (160-1820 m). The ores occur as dissemination, vein, and breccia cement. The main sulfide assemblage is sphalerite + galena + pyrite + marcasite +/- chalcopyrite +/- tetrahedrite, and gangue minerals consist mainly of calcite, dolomite, barite, and quartz. Samples of pre- to post-ore stages calcite yielded delta(13)C and delta(18)O values that are, respectively, similar to and lower than those yielded by the host limestones, suggesting that the calcite formed from fluids derived from carbonate dissolution. Fluid inclusions in calcite and sphalerite in the polymetallic sulfidization stage mostly comprise liquid and gas phases at room temperature, with moderate homogenization temperatures (100-140 degrees C) and high salinities (21-28 wt% NaCl eq.). Micro-thermometric fluid inclusion data point to polysaline brines as ore-forming fluids. The delta D and delta(18)O values of ore fluids, cation compositions of fluid inclusions, and geological information suggest two main possible fluid sources, namely basinal brines and evaporated seawater. The fluid inclusion data and regional geology suggest that basinal brines derived from Tertiary basins located southeast of the Dongmozhazhua deposit migrated along deep detachment zones of the regional thrust system, leached substantial base metals from country rocks, and finally ascended along thrust faults at Dongmozhazhua. There, the base-metal-rich basinal brines mixed with bacterially-reduced H(2)S-bearing fluids derived from evaporated seawater preserved in the Permo-Triassic carbonate strata. The mixing of the two fluids resulted in Pb-Zn mineralization. The Dongmozhazhua Pb-Zn deposit has many characteristics that are similar to MVT Pb-Zn deposits worldwide.
学科主题	矿床地质
WOS关键词	EAST-CENTRAL TIBET ; TECTONIC CONTROLS ; FORMATION WATERS ; ORIGIN ; OXYGEN ; GEOCHEMISTRY ; EVOLUTION ; HYDROGEN ; SULFATE ; SULFUR
WOS研究方向	Geology ; Mineralogy
语种	英语
出版者	WILEY-BLACKWELL
WOS记录号	WOS:000295180200006
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39421]
专题	中国地质调查局
作者单位	Univ Twente, Dept Earth Syst Anal, Fac Geoinformat Sci & Earth Observat ITC, NL-7500 AE Enschede, Netherlands
推荐引用方式 GB/T 7714	Liu, YC ,Hou, ZQ ,Yang, ZS ,et al. Formation of the Dongmozhazhua Pb-Zn Deposit in the Thrust-Fold Setting of the Tibetan Plateau, China Evidence from Fluid Inclusion and Stable Isotope Data[J]. RESOURCE GEOLOGY,2011,61(4):384-406.
APA	Liu, YC .,Hou, ZQ .,Yang, ZS .,Tian, SH .,Yang, TN .,...&Carranza, EJM .(2011).Formation of the Dongmozhazhua Pb-Zn Deposit in the Thrust-Fold Setting of the Tibetan Plateau, China Evidence from Fluid Inclusion and Stable Isotope Data.RESOURCE GEOLOGY,61(4),384-406.
MLA	Liu, YC ,et al."Formation of the Dongmozhazhua Pb-Zn Deposit in the Thrust-Fold Setting of the Tibetan Plateau, China Evidence from Fluid Inclusion and Stable Isotope Data".RESOURCE GEOLOGY 61.4(2011):384-406.