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Redox states and genesis of magmas associated with intra-continental porphyry Cu–Au mineralization within the Jinshajiang–Red River alkaline igneous belt, SW China
Leiluo Xu;  Xianwu Bi;  Ruizhong Hu;  Youqiang Qi;  Yongyong Tang;  Xinsong Wang;  Jingjing Zhu
2016
Source PublicationOre Geology Reviews
Volume73Issue:Part 2Pages:330-345
Abstract

The Jinshajiang–Red River alkaline igneous belt and the associated Cenozoic Cu–Au mineralization are located in an intra-continental strike-slip fault zone in SW China. The Ce4 +/Ce3 + ratios of zircon from representative Cu-mineralized, Au-mineralized and barren porphyry intrusions from the belt indicate that the Cu–Au ore-bearing porphyry intrusions had much higher fO2 of magma than the barren porphyry intrusions. Elemental and Sr–Nd isotope ratio data indicate that both the Cu–Au ore-bearing and barren porphyry intrusions were derived from partial melts of the ancient enriched metasomatized mantle sources (EMII type). The mantle source was possibly modified by subduction of the Paleo-Tethyan oceanic slab beneath the Changdu–Simao block between the early Permian and the late Triassic. The oxygen fugacity of the magma was likely related to the redox state of the source, and the different fO2 calculated for the magmas that gave rise to Cu–Au ore-bearing and barren porphyry intrusions are a product of magmas from the different sources. The sources of the barren porphyry intrusions were influenced mainly by the slab-derived fluids, whereas the sources of the Cu–Au ore-bearing porphyry intrusions were modified by both the slab-derived fluids and slab-derived melts. Cenozoic strike-slip faulting in this region caused lithospheric-scale extension and upwelling of the asthenosphere; the heat produced by this process produced partial melts of the ancient enriched metasomatized mantle sources, resulting in the emplacement of alkaline porphyry intrusions and associated Cu–Au mineralization at ~ 40–30 Ma.

KeywordRedox States genesis ce4 +/ce3 + Ratios Of Zircon cu–au Ore-bearing And Barren Porphyry Intrusions jinshajiang–red River Alkaline Igneous Belt
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/9607
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China
Recommended Citation
GB/T 7714
Leiluo Xu;Xianwu Bi;Ruizhong Hu;Youqiang Qi;Yongyong Tang;Xinsong Wang;Jingjing Zhu. Redox states and genesis of magmas associated with intra-continental porphyry Cu–Au mineralization within the Jinshajiang–Red River alkaline igneous belt, SW China[J]. Ore Geology Reviews,2016,73(Part 2):330-345.
APA Leiluo Xu;Xianwu Bi;Ruizhong Hu;Youqiang Qi;Yongyong Tang;Xinsong Wang;Jingjing Zhu.(2016).Redox states and genesis of magmas associated with intra-continental porphyry Cu–Au mineralization within the Jinshajiang–Red River alkaline igneous belt, SW China.Ore Geology Reviews,73(Part 2),330-345.
MLA Leiluo Xu;Xianwu Bi;Ruizhong Hu;Youqiang Qi;Yongyong Tang;Xinsong Wang;Jingjing Zhu."Redox states and genesis of magmas associated with intra-continental porphyry Cu–Au mineralization within the Jinshajiang–Red River alkaline igneous belt, SW China".Ore Geology Reviews 73.Part 2(2016):330-345.
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