Copper isotopes trace the evolution of skarn ores: a case study from the Hongshan-Hongniu Cu deposit, southwest China

Wang, Peng, Dong, Guochen, Santosh, M., Liu, Kairan, and Li, Xuefeng (2017) Copper isotopes trace the evolution of skarn ores: a case study from the Hongshan-Hongniu Cu deposit, southwest China. Ore Geology Reviews, 88. pp. 822-831.

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Abstract

Transition metal isotopes are sensitive geochemical tracers of ore genesis. Here we present MC-ICP-MS analytical data of Cu isotope compositions from the Hongshan-Hongniu Cu deposit in Yunnan province. The δ 65 Cu values (δ 65 Cu = [( 65 Cu/ 63 Cu) sample /( 65 Cu/ 63 Cu) NIST976  − 1] × 1000) of seven whole-rock quartz monzonite porphyries and twenty-two chalcopyrite samples from the skarn ore-bodies display relatively narrow ranges from −0.15‰ to 0.38‰ and from −0.02‰ to 0.77‰, respectively. The overlap of δ 65 Cu values indicates a genetic relationship between the quartz monzonite porphyry and skarn ore-bodies. We also evaluate the spatial and temporal variations of Cu isotope compositions in the skarn ore-bodies by comparison with some well-documented porphyry deposits in the world. The quartz monzonite porphyry shows compositional zoning with the inner domain enriched in heavy Cu isotope and the skarn related to the porphyry depleted in heavy Cu isotope. The chalcopyrites that formed during the late stage of mineralization tend to be enriched in heavy Cu isotope, and this feature is analogous to porphyry deposits. The δ 65 Cu values of the quartz monzonite porphyry show typical features of hypogene mineralization, suggesting a potential scope for deep exploration and development in this deposit.

Item ID: 53964
Item Type: Article (Research - C1)
ISSN: 1872-7360
Keywords: chalcopyrite; Cu isotope; Hongshan-Hongniu; quartz monzonite porphyry; skarn
Funders: National Key Project for Basic Research of China (NKP), China Geological Survey (CGS), 111 Project (111)
Projects and Grants: NKP 2015CB452604, CGS project 1212011220920, CGS project 1212011121260, 111 project B07011
Date Deposited: 11 Jun 2018 04:39
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040307 Ore Deposit Petrology @ 100%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840102 Copper Ore Exploration @ 100%
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