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Geochronological and geochemical constraints on sulfide mineralization in the Qingmingshan mafic intrusion in the western part of the Proterozoic Jiangnan orogenic belt along the southern margin of th
Yi Zhou;  Hong Zhong;  Chusi Li;  Edward M.Ripley;  Wei-Guang Zhu;  Zhong-Jie Bai;  Chao Li
2017
发表期刊Ore Geology Reviews
卷号90页码:618-633
摘要

The Qingmingshan magmatic Fe-Ni-Cu sulfide deposit is located in the southern margin of the Yangtze Craton, in the western part of the Proterozoic Jiangnan orogenic belt. Sulfide mineralization occurs as disseminated zones in a dike-like mafic body intruding Early Neoproterozoic meta-sedimentary rocks. The host intrusion can be further divided into an upper gabbronorite unit, a middle dolerite unit and a lower gabbronorite unit. Each unit contains at least one disseminated sulfide zone. Sulfide mineral assemblages are composed of pyrrhotite, pentlandite and chalcopyrite. Zircon U–Pb dating yields a crystallization age of 847.8 ± 3.8 Ma (2σ) for the intrusion. The host rocks are characterized by enrichment in light rare earth elements (REE) relative to heavy REE and show pronounced negative Nb-Ta anomalies, similar to the characteristics of arc mafic igneous rocks worldwide. Mixing calculations indicate that the variations of (Th/Yb)N and (Th/Nb)N in the intrusion are consistent with between 10 and 20 wt% crustal contamination of the parental magma. The sulfide separates are characterized by elevated δ34S values from 1.5 to 3.5‰, with a peak at 2.6‰, and by γOs values from 2 to 89, indicating addition of crustal sulfur and Os to the parental magma. The trace element data and S-Os isotopes support the premise that sulfide saturation in the Qingmingshan magma was triggered by crustal contamination. Variations of PGE tenors in different sulfide zones can be explained by variable R-factors from 300 to 1000 during sulfide segregation from the magma. Mass balance calculations indicate that the parental magma was severely depleted in PGE, which could be a primary signature of arc basaltic magma formed by low degrees of partial melting or due to previous sulfide segregation at depth. The lithological and mineralization zonation across the dike-like Qingmingshan mafic intrusion indicates that at least three separate pulses of sulfide-charged magma were involved in the formation of the Qingmingshan magmatic sulfide deposit. The Qingmingshan mafic intrusion is interpreted to be a part of a sub-arc magma plumbing system. Coeval ultramafic intrusions formed from more primitive magma in the region are good exploration targets for magmatic sulfide deposits with higher Ni/Cu ratios than the Qingmingshan deposit.

关键词Zircon U-pb Age Os-s Isotopes Sulfide Mineralization Pge Geochemistry Mafic-ultramafic Rocks Jiangnan Orogenic Belt South China
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/8435
专题矿床地球化学国家重点实验室
作者单位1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.Department of Earth and Atmospheric Sciences, Indiana University, Bloomington, IN 47405, USA
4.National Research Center for Geoanalysis, Beijing 100037, China
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Yi Zhou;Hong Zhong;Chusi Li;Edward M.Ripley;Wei-Guang Zhu;Zhong-Jie Bai;Chao Li. Geochronological and geochemical constraints on sulfide mineralization in the Qingmingshan mafic intrusion in the western part of the Proterozoic Jiangnan orogenic belt along the southern margin of th[J]. Ore Geology Reviews,2017,90:618-633.
APA Yi Zhou;Hong Zhong;Chusi Li;Edward M.Ripley;Wei-Guang Zhu;Zhong-Jie Bai;Chao Li.(2017).Geochronological and geochemical constraints on sulfide mineralization in the Qingmingshan mafic intrusion in the western part of the Proterozoic Jiangnan orogenic belt along the southern margin of th.Ore Geology Reviews,90,618-633.
MLA Yi Zhou;Hong Zhong;Chusi Li;Edward M.Ripley;Wei-Guang Zhu;Zhong-Jie Bai;Chao Li."Geochronological and geochemical constraints on sulfide mineralization in the Qingmingshan mafic intrusion in the western part of the Proterozoic Jiangnan orogenic belt along the southern margin of th".Ore Geology Reviews 90(2017):618-633.
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