投稿时间：2025-02-25
修订日期：2025-05-07
网络发布日期：2025-07-01
中文摘要:准噶尔北缘以发育铜多金属矿为特征，近年来新发现蕴都卡拉少见的金铜钴矿。蕴都卡拉矿区主要发育早泥盆世的似斑状闪长岩、细粒闪长岩、辉石闪长岩和辉石闪长玢岩脉。矿体赋存于细粒闪长岩中或与玄武岩接触带附近。文章开展了4种闪长岩岩石学、主量、微量元素和Sr-Nd同位素研究。微量元素含量表明，闪长质岩浆是铜、钴、硫等成矿物质的重要来源。这些闪长岩类具有相似的地球化学特征，富钠、钙碱性-高钾钙碱性、富集大离子亲石元素（如Ba、K、Sr）和轻稀土元素，亏损高场强元素（Th、Nb、Ta和Ti），为典型的与俯冲相关的侵入岩，形成于大洋岛弧环境。闪长岩类具有中等的镁指数（Mg#=49.41~65.17，1件样品为38.75）、正的εNd（t）值（1.43~3.97），表明闪长质岩浆主要由受俯冲流体和俯冲沉积物交代的富集地幔楔发生部分熔融形成，岩浆分离结晶作用形成不同的侵入体，这种复杂的岩浆成因和结晶分异作用有利于金铜钴成矿。
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 intrusive 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 characteristics, 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 subduction 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.
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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
引用文本：
杨富全,张汉清,陈新杰,杨俊杰,张艳灵.2025.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,44(3):519~536YANG FuQuan,ZHANG HanQing,CHEN XinJie,YANG JunJie,ZHANG YanLing.2025.Petrogenesis and geological significance of dioritoid in Yundukala Au-Cu-Co ore district, East Junggar, Xinjiang[J].Mineral Deposits44(3):519~536
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