Tracing the ore-formation history of the shear-zone-controlled Huogeqi   Cu-Pb-Zn deposit in Inner Mongolia, northern China, using H, O, S, and   Fe isotopes

doi:10.1016/j.oregeorev.2015.06.003

CORC > 北京大学 > 地球与空间科学学院

	Tracing the ore-formation history of the shear-zone-controlled Huogeqi Cu-Pb-Zn deposit in Inner Mongolia, northern China, using H, O, S, and Fe isotopes
	Pi, Qiaohui ; Zhong, Richen ; Hu, Ruizhong
刊名	ORE GEOLOGY REVIEWS
	2015
关键词	H-O-S-Fe isotopes Huogeqi Shear zone Cu-Pb-Zn Multistage mineralization ZIRCON U-PB HYDROTHERMAL FLUIDS HYDROGEN ISOTOPE SOLONKER SUTURE OROGENIC BELT AU DEPOSIT NW CHINA OXYGEN FRACTIONATION GENESIS
DOI	10.1016/j.oregeorev.2015.06.003
英文摘要	The original ore-fluid of the Huogeqi Cu-Pb-Zn deposit in Inner Mongolia, northern China, was enriched in heavy oxygen isotopes with delta O-18 values ranging from 9.9 to 11.4 per mu, which is characteristic of the metamorphic devolatilization of pelitic rocks. The delta D values determined by direct measurement of syn-ore hydrothermal tremolite range from -116 to -82 per mil, lying between the domains of typical metamorphic fluid and meteoric water, which is in equilibrium with organic matter. Oxygen and hydrogen isotope ratios indicate that the orefluid was derived from deep-sourced metamorphic fluid and interacted with organic-rich shale during fluid migration, which is consistent with the fluid evolution history revealed by a previous fluid inclusion study. Sulfides in the deposit are characteristically enriched in heavy S isotopes, with an average delta S-34 value of 13.4 +/- 6.2 per mil (1 sigma, n = 103). The S-isotope ratios are identical to stratabound sulfides generated through the non-bacterial reduction of Neoproterozoic marine sulfate (with delta S-34 values of similar to 17 per mil). Previous studies on lead isotopes of sulfides revealed that the ore-forming metals (Cu, Pb, and Zn) at the Huogeqi deposit were also remobilized-from a stratabound source. This source was syngenetically elevated in its Cu-, Pb-, and Zn-sulfide content as a result of submarine hydrothermal activities forming sulfide-rich layers within a rift tectonic setting. The Fe isotope ratios for sulfides are consistent with those of an intercalated iron-formation within the ore-hosting rocks, suggesting that the Fe in the sulfides was derived from local host rocks during sulfide precipitation and the Fe-rich rocks are favorable lithological units for high-grade mineralization. The heterogeneous sources of ore-fluid, S, ore-forming metals, and Fe are explained by a multistage genetic model, which is supported by the geological characteristic of the deposit. The enriched sulfides were subsequently remobilized and enriched by metamorphic devolatilization during the Permian and Triassic periods. The metamorphic ore-fluid ascended along a shear zone and interacted with organic-rich shale. Sulfides eventually precipitated within the shear zone at a shallower crustal level, especially where the shear zone intersected Fe-rich host rocks. This multistage genetic model has implications for mineral exploration. Greenschist to amphibolite facies terranes containing thick Neoproterozoic rift sequences are ideal regions for potential Cu-Pb-Zn mineralization. In particular, intercalated volcanic rocks within the rift sequences are indicative of high heat-flow and are ideal for the development of submarine hydrothermal systems. The primary structures hosting mineralization and ore shoots in the Huogeqi area are jogs in the shear zones. In addition, Fe-rich lithological units, such as iron-formations, are ideal hosts for high-grade ore. (C) 2015 Elsevier B.V. All rights reserved.; Bagui Scholar Innovation Project of Guangxi Province [2013X]; Inner Mongolia Autonomous Region Department of Land and Resources [05-6-YS2]; National Basic Research Program of the People's Republic of China [2006CB403500, 2013CB429801]; National Natural Science Foundation of China [40972057]; SCI(E); EI; ARTICLE; zhongrichen@126.com; ,SI; 263-272; 71
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/415275]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Pi, Qiaohui,Zhong, Richen,Hu, Ruizhong. Tracing the ore-formation history of the shear-zone-controlled Huogeqi Cu-Pb-Zn deposit in Inner Mongolia, northern China, using H, O, S, and Fe isotopes[J]. ORE GEOLOGY REVIEWS,2015.
APA	Pi, Qiaohui,Zhong, Richen,&Hu, Ruizhong.(2015).Tracing the ore-formation history of the shear-zone-controlled Huogeqi Cu-Pb-Zn deposit in Inner Mongolia, northern China, using H, O, S, and Fe isotopes.ORE GEOLOGY REVIEWS.
MLA	Pi, Qiaohui,et al."Tracing the ore-formation history of the shear-zone-controlled Huogeqi Cu-Pb-Zn deposit in Inner Mongolia, northern China, using H, O, S, and Fe isotopes".ORE GEOLOGY REVIEWS (2015).