Pb-Sr-Nd isotope constraints on the fluid source of the Dahu Au-Mo   deposit in Qinling Orogen, central China, and implication for Triassic   tectonic setting

doi:10.1016/j.oregeorev.2012.01.004

CORC > 北京大学 > 地球与空间科学学院

	Pb-Sr-Nd isotope constraints on the fluid source of the Dahu Au-Mo deposit in Qinling Orogen, central China, and implication for Triassic tectonic setting
	Ni, Zhi-Yong ; Chen, Yan-Jing ; Li, Nuo ; Zhang, Hui
刊名	ore geology reviews
	2012
关键词	Sr-Nd-Pb isotope systematics Ore-forming fluid The Dahu Au-Mo deposit Qinling Orogen Oceanic plate subduction ORE GENESIS GOLD DEPOSITS BELT MINERALIZATION GEOCHEMISTRY PROVINCES EVOLUTION ELEMENT CRATON HENAN
DOI	10.1016/j.oregeorev.2012.01.004
英文摘要	The Dahu Au-Mo deposit is a structure-controlled lode system occurring in the northern Xiaoqinling terrane, Huaxiong Block, Qinling Orogen. This paper reports a new Sr-Nd-Pb isotope dataset obtained for ore sulfides and the hostrocics within the Taihua Supergroup, in an attempt to constrain the source of the ore-forming fluids from a new dimension. 16 sulfide samples yield I-Sr ratios of 0.70470-0.71312, with an average of 0.70854; epsilon(Nd)(t) values between -13.5 and -18.1, with average of -15.1; and (Pb-206/Pb-204)(i), (Pb-207/Pb-204)(i) and (Pb-208/Pb-204)i ratios of 17.033-17.285, 15.358-15.438, and 37.307-37.582, with averages of 17.162, 15.405, and 37.440, respectively. 5 gneiss samples from the Taihua Supergroup yield I-Sr ratios of 0.70947-0.73201, averaging 0.72294; epsilon(Nd)(t) values of -20.0 to -31.1. averaging -25.1; and (Pb-206/Pb-204)(i), (Pb-207/Pb-204)(i), (Pb-208/Pb-204)(i) ratios of 17.127-18.392, 15.416-15.604 and 37.498-37.814, with averages of 17.547, 15.470 and 37.616, respectively. These data show that the ore sulfides have less radiogenic Sr-Nd-Pb isotope systematics than the hostrocks, and suggest that the ore-forming fluids, which interacted with the wallrocks to form ores, must be sourced from a depleted mantle or a depleted, subducted oceanic slab. In combination with the spatial scenario and geochemical signatures of the Triassic magmatites and mineral systems, we argue that in the Triassic the Mianlue Ocean was not completely closed, and that the northward oceanic plate subduction still survived along the Mian-Lue suture, which caused the Late Triassic magmatism and associated mineralization in Qinling Orogen, including the Au-Mo Dahu deposit. (c) 2012 Elsevier B.V. All rights reserved.; Geology; Mineralogy; Mining & Mineral Processing; SCI(E); EI; 0; REVIEW; 60-67; 46
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/232605]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Ni, Zhi-Yong,Chen, Yan-Jing,Li, Nuo,et al. Pb-Sr-Nd isotope constraints on the fluid source of the Dahu Au-Mo deposit in Qinling Orogen, central China, and implication for Triassic tectonic setting[J]. ore geology reviews,2012.
APA	Ni, Zhi-Yong,Chen, Yan-Jing,Li, Nuo,&Zhang, Hui.(2012).Pb-Sr-Nd isotope constraints on the fluid source of the Dahu Au-Mo deposit in Qinling Orogen, central China, and implication for Triassic tectonic setting.ore geology reviews.
MLA	Ni, Zhi-Yong,et al."Pb-Sr-Nd isotope constraints on the fluid source of the Dahu Au-Mo deposit in Qinling Orogen, central China, and implication for Triassic tectonic setting".ore geology reviews (2012).