西北地质2025，Vol.58Issue(4)：23-40,18.DOI:10.12401/j.nwg.2025015
铜同位素在高温岩浆系统中的研究进展及其在岩浆硫化物矿床中的应用
Research Progress on Copper Isotope in High-temperature Magmatic System and Its Implications for Magmatic Sulfide Deposits
摘要
Abstract
Copper isotope exhibits significant variations during high-temperature geological processes such as mantle partial melting,magmatic differentiation,and mantle metasomatism.Notably,a～4‰ variation in Cu isotope has been observed in magmatic Ni-Cu sulfide systems,challenging the conventional understanding that fractionation of metal stable isotopes is predominantly controlled by temperature.Beyond the Sudbury deposit,which formed via meteoritic impact,Ni-Cu deposits in intraplate and orogenic settings show a wide range of Cu isotope variations,highlighting their potential for studying complex magmatic and metallogenic processes.Cur-rent insights include:① Cu isotope in mantle is highly heterogeneous.Mid-ocean ridge basalts and komatiites better represent the Cu isotopic composition of the mantle source.② The coupled behavior of Cu concentra-tions and isotopes,as well as the fractionation coefficients between sulfides and silicates,are crucial for under-standing Cu isotopic changes during magma formation and evolution.③ Research on Cu isotope fractionation during metamorphic dehydration in subduction zones remains limited,resulting in significant uncertainty in us-ing Cu isotope to trace Cu migration paths.Since most Cu is retained in the subducting slab,Cu isotopic devia-tions from mantle values in subduction-related rocks may be coincidental.④ Cu isotope variations in Ni-Cu de-posits are controlled by multiple geological processes and fractionation mechanisms,including:heterogeneity in mantle Cu isotope,crustal contamination,sulfide segregation and differentiation,and redox state changes in the magmatic system.The crucial role of Cu isotopes in revealing the processes of diagenesis and mineralization is increasingly prominent.In the future,efforts should be intensified to explore the synergistic effects of Cu iso-topes with other isotope systems(such as Fe,Zn,Ni,etc.),combining experiments and simulations to refine the mineralization models of magmatic Cu-Ni sulfide deposits.This has significant implications for gaining a deep-er understanding of crust-mantle material cycling and its resource effects.关键词
Cu同位素/高温岩浆过程/分馏机理/岩浆铜镍硫化物矿床Key words
Cu isotope/high-temperature magma process/isotope fractionation mechanism/magmatic Ni-Cu sulfide deposit分类
天文与地球科学引用本文复制引用
张泽,薛胜超,唐冬梅,王信水,王路阳,王晓曼,张瑞麟..铜同位素在高温岩浆系统中的研究进展及其在岩浆硫化物矿床中的应用[J].西北地质,2025,58(4):23-40,18.基金项目
国家自然科学基金面上项目(42172076)和求真学人计划项目(265QZ2022008)联合资助. （42172076）
