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Enrichment of Platinum-group Elements (PGE) and Re-Os Isotopic Tracing for Porphyry Copper (Gold) Deposits
Xiaohu HE; Hong ZHONG; Weiguang ZHU
2014
发表期刊Acta Geologica Sinica
卷号88期号:4页码:1288-1309
摘要
Platinum-group elements (PGE) in PGE-rich porphyry copper (gold) deposits are mainly Pt and Pd, whereas the concentrations of other PGE (Ru, Rh, Os, Ir) are significantly low. Moreover, Pt and Pd mainly exist in sulfides in the forms of crystal lattice or tiny platinum-group mineral (PGM) inclusions. The present data show that there is a positive relationship between Pt and Pd concentrations and Cu (Au) in porphyry copper (gold) deposits. The comparison of chondrite-normalized PGE distribution patterns between the ore-bearing porphyry intrusions and ore-barren porphyry intrusions in arc setting, 187Os/188Os, 87Sr/86Sr and S isotopes for porphyry copper (gold) deposits shows that PGEs were mainly derived from the mantle, and fluids from subduction zones devoted trivial PGE to the magma. The porphyry copper (gold) deposits associated with subducted events are most probably enriched in PGE, whereas those related to crustal thickening, lithospheric delamination or underplating rarely concentrate PGE. The osmium isotopic compositions in porphyry copper (gold) deposits reveal that (187Os/188Os)i values are highly variable and not lower than those of primitive upper mantle (PUM) and mantle peridotite, however, osmium concentrations are commonly lower than mantle peridotite, suggesting that parental magmas of some porphyry intrusions had experienced crustal contamination during magma evolution. Experimental investigations have proved that PGE exist in the forms of Cl- and HS- complexes during transportation and migration of the ore-forming fluids. This paper summarizes previous studies including crucial controlling factors and mechanisms for PGE enrichment, and points out that the mantle-derived magmas parental to porphyry intrusions are the prerequisite for PGE enrichment in porphyry copper (gold) deposits. Favorable physical and chemical conditions (including salinity, temperature, pressure, pH, and oxygen fugacity) in hydrothermal fluids crucially control the PGE enrichment, and sulfur concentrations of melts play important roles in this process as well.
关键词Pge Re-os Isotope Forms Of Migration Enrichment Process Porphyry Copper(Gold) Deposits
学科领域矿床地球化学
收录类别其他
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/352002/5272
专题矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文
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GB/T 7714
Xiaohu HE,Hong ZHONG,Weiguang ZHU. Enrichment of Platinum-group Elements (PGE) and Re-Os Isotopic Tracing for Porphyry Copper (Gold) Deposits[J]. Acta Geologica Sinica,2014,88(4):1288-1309.
APA Xiaohu HE,Hong ZHONG,&Weiguang ZHU.(2014).Enrichment of Platinum-group Elements (PGE) and Re-Os Isotopic Tracing for Porphyry Copper (Gold) Deposits.Acta Geologica Sinica,88(4),1288-1309.
MLA Xiaohu HE,et al."Enrichment of Platinum-group Elements (PGE) and Re-Os Isotopic Tracing for Porphyry Copper (Gold) Deposits".Acta Geologica Sinica 88.4(2014):1288-1309.
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