Response of Fe-Ni-Cu isotope systematics to sulfide liquid oxygen content: Implications for magmatic sulfide Co enrichment in orogenic settings

IF 4.5 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Geochimica et Cosmochimica Acta Pub Date : 2024-12-18 DOI:10.1016/j.gca.2024.12.018

Dongmei Tang, Marina Lazarov, Dachuan Wang, Noreen J. Evans, Kezhang Qin, Shengchao Xue, Ingo Horn, Stefan Weyer

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Abstract

The initial silicate melt related to magmatic Ni-Cu deposits located in orogenic settings in China (e.g., East Tianshan orogenic belt, East Kunlun orogenic belt) had a high fO2 that progressively decreased with continued magmatic evolution. It is still unknown if the sulfide melt that separated from the silicate melt inherited this high fO2, or even whether oxygen fugacity in sulfide plays an important role in the mineralization processes. In this work we undertook new in situ Fe, Cu, and Ni isotopic analyses of base metal sulfides from the Xiarihamu magmatic sulfide deposit (East Kunlun orogenic belt), and combined this new data with previously published Fe and Cu isotopic results from orogenic and cratonic magmatic sulfide deposits to assess changes in fO2 in sulfide during sulfide melt evolution, and the role of these processes in metal enrichment.

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Fe-Ni-Cu同位素系统对硫化物液氧含量的响应：造山带岩浆硫化物Co富集的意义

在中国的造山带（如东天山造山带、东昆仑造山带），与岩浆镍铜矿床相关的初始硅酸盐熔体具有较高的fO2，并随着岩浆的持续演化逐渐降低。目前尚不清楚从硅酸盐熔体中分离出来的硫化物熔体是否继承了这种高fO2，甚至硫化物中的氧逸度是否在成矿过程中起重要作用。本文对东昆仑造山带下日哈木岩浆硫化物矿床的基本金属硫化物进行了新的原位Fe、Cu和Ni同位素分析，并结合前人发表的造山带和克拉通岩浆硫化物矿床的Fe和Cu同位素结果，评价了硫化物熔体演化过程中硫化物中fO2的变化及其在金属富集中的作用。

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来源期刊

Geochimica et Cosmochimica Acta 地学-地球化学与地球物理

CiteScore

9.60

自引率

14.00%

发文量

437

审稿时长

6 months

期刊介绍： Geochimica et Cosmochimica Acta publishes research papers in a wide range of subjects in terrestrial geochemistry, meteoritics, and planetary geochemistry. The scope of the journal includes: 1). Physical chemistry of gases, aqueous solutions, glasses, and crystalline solids 2). Igneous and metamorphic petrology 3). Chemical processes in the atmosphere, hydrosphere, biosphere, and lithosphere of the Earth 4). Organic geochemistry 5). Isotope geochemistry 6). Meteoritics and meteorite impacts 7). Lunar science; and 8). Planetary geochemistry.