矿床地质2025，Vol.44Issue(3)：519-536,18.DOI:10.16111/j.0258-7106.2025.03.001
新疆东准噶尔蕴都卡拉金铜钴矿区闪长岩类岩石成因及其地质意义
Petrogenesis and geological significance of dioritoid in Yundukala Au-Cu-Co ore district,East Junggar,Xinjiang
摘要
Abstract
The northern Junggar is characterized by the development of polymetallic copper deposits,and a unique gold-copper-cobalt deposits in the Yundukala have been newly discovered in recent years.The ore district intru-sive rocks are mainly porphyritic diorite,fine-grained diorite,pyroxene diorite,and pyroxene diorite porphyrite dyke in the Early Devonian.The Au-Cu-Co orebody is mainly distributed in the fine-grained diorite and/or its contact zone with the basalt.The petrology,major,trace elements and Sr-Nd isotopes of four kinds of diorite have been studied in this paper.The contents of trace elements indicate that the magma of diorite is an important source of ore-forming materials such as copper,cobalt and sulfur.The dioritoid have similar geochemical charac-teristics,such as sodium rich,calc-alkaline-high-K calc-alkaline,enrichment in large ion lithophile elements(such as Ba,K,Sr)and LREE,and depletion in high field strength elements(Th,Nb,Ta and Ti).They are typical subduction-related intrusive rocks formed in the ocean island arc environment.The dioritoid have a medium Mg index(Mg#=49.41～65.17,one sample is 38.75)and a positive εNd(t)value(1.43～3.97),indicating that the dioritic magma was mainly formed by partial melting of the enriched mantle wedge that was metasomatized by subduc-tion fluids and sediments,and different intrusions are formed by fractional crystalization.This complex magmatic genesis and fractional crystalization is conducive to Au-Cu-Co mineralization.关键词
Sr-Nd同位素/岩石地球化学/闪长岩类/蕴都卡拉金铜钴矿/东准噶尔Key words
Sr-Nd isotope/petrogeochemistry/dioritoid/Yundukala Au-Cu-Co deposit/East Junggar分类
地质学引用本文复制引用
杨富全,张汉清,陈新杰,杨俊杰,张艳灵..新疆东准噶尔蕴都卡拉金铜钴矿区闪长岩类岩石成因及其地质意义[J].矿床地质,2025,44(3):519-536,18.基金项目
本文得到国家自然科学基金项目(编号:41972079)、新疆阿勒泰地区科技计划项目(编号:202427)、新疆维吾尔自治区重点研发任务专项(编号:2023B03006-2)和新疆维吾尔自治区"天池英才"引进计划联合资助 （编号:41972079）
