Re-Os and Sr-Nd-Pb isotope constraints on source of fluids in the   Zhifang Mo deposit, Qinling Orogen, China

doi:10.1016/j.gr.2015.02.020

CORC > 北京大学 > 地球与空间科学学院

	Re-Os and Sr-Nd-Pb isotope constraints on source of fluids in the Zhifang Mo deposit, Qinling Orogen, China
	Deng, Xiao-Hua ; Chen, Yan-Jing ; Santosh, M. ; Yao, Jun-Ming ; Sun, Ya-Li
刊名	GONDWANA RESEARCH
	2016
关键词	Re-Os geochronology Pb-Sr-Nd isotope systematics Ore-forming fluid Zhifang Mo deposit Qinling Orogen ULTRAHIGH-TEMPERATURE METAMORPHISM MOLYBDENITE-FLUORITE DEPOSIT XIAOQINLING GOLD FIELD ORE-FORMING FLUIDS ZIRCON U-PB SM-ND HENAN PROVINCE INCLUSION GEOCHEMISTRY MESOPROTEROZOIC SUPERCONTINENT COLUMBIA SUPERCONTINENT
DOI	10.1016/j.gr.2015.02.020
英文摘要	The Zhifang Mo deposit is located in the northeastern Qinling Orogen along the southern margin of the North China Craton. The deposit represents a quartz-vein system hosted in the Mesoproterozoic Xiong'er Group volcanic rocks. We identify three hydrothermal stages (early, middle and late), characterized by veinlets of quartz-pyrite, quartz-molybdenite-pyrite-chalcopyrite-galena-sphalerite, and quartz-carbonate assemblages, respectively. Five molybdenite samples from the Zhifang deposit yield Re-Os ages ranging from 241.2 +/- 1.6 Ma to 247.4 +/- 2.5 Ma, with an isochron age of 246.0 +/- 5.2 Ma (2 sigma, MSWD = 7.4), and a weighted mean age of 243.8 +/- 2.8 Ma (26, MSWD = 5.5). The Re-Os age shows that the Mo mineralization occurred during the Indosinian Orogeny, and suggests that the mineralization is unrelated to the Yanshanian magmatism or the Paleo-Mesoproterozoic volcanic-hydrothermal event. This study also reports a new Sr-Nd-Pb isotope dataset from ore sulfides in an attempt to constrain the source of the ore-forming fluids. Ten sulfide samples from middle stage of the Zhifang Mo deposit yield I-sr(t) ratios of 0.710286-0.711943, with an average of 0.711004; epsilon(Nd)(t) values between -19.5 and -14.8, with an average of -16.7; and ((206)pb/(204)pb)(i), ((207)pb/(204)pb)(i) and ((208)pb/(204),pb)(i) ratios of 17.126-17.535, 15.374-15.466 and 37.485-37.848, with averages of 17.380,15.410 and 37.631, respectively. One pyrite from the early stage yield I-sr(t) of 0.722711-0.722855, with an average of 0.722783, which is higher than those of the middle stage sulfides and suggests equilibration with wallrocks. The epsilon Nd(t) values are in the range of -173 to -16.6 with a mean at -17.0; and ((206)pb/(204)pb)(i), ((207)pb/(204)pb)(i) and (Pb-208/Pb-204)(i) ratios are 17386,15.405 and 37.622, respectively. The ore sulfides show higher Pb-isotope ratios, higher epsilon(Nd)(t) and lower I-sr(t) values than the host rocks. The results suggest that the ore-forming fluids had lower I-sr(t), and higher epsilon(Nd)(t) values than the ore sulfides, and were possibly sourced from the Dengfeng Complex. The southward subduction of the North China Craton beneath the Huaxiong Block during the Triassic was possibly responsible for the formation of the Waifangshan orogenic Mo system. (C) 2015 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.; National Basic Research Program [2012CB416602, 2006CB403508]; National Natural Science Foundation of China [41202050, 41372085, 41403032]; China Postdoctoral Science Foundation [2012M510261]; Chinese Government; SCI(E); ARTICLE; yjchen@pku.edu.cn; ,SI; 132-143; 30
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/438700]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Deng, Xiao-Hua,Chen, Yan-Jing,Santosh, M.,et al. Re-Os and Sr-Nd-Pb isotope constraints on source of fluids in the Zhifang Mo deposit, Qinling Orogen, China[J]. GONDWANA RESEARCH,2016.
APA	Deng, Xiao-Hua,Chen, Yan-Jing,Santosh, M.,Yao, Jun-Ming,&Sun, Ya-Li.(2016).Re-Os and Sr-Nd-Pb isotope constraints on source of fluids in the Zhifang Mo deposit, Qinling Orogen, China.GONDWANA RESEARCH.
MLA	Deng, Xiao-Hua,et al."Re-Os and Sr-Nd-Pb isotope constraints on source of fluids in the Zhifang Mo deposit, Qinling Orogen, China".GONDWANA RESEARCH (2016).