摘要
前寒武纪是中国铜成矿作用的一个重要时期,该时期形成的铜矿占中国铜矿的24.4%,它们位于前寒武纪陆块边缘的裂陷带。矿床类型按容矿岩原岩的岩性主要有沉积岩型、火山岩型、基性-超基性岩型及斑岩与火山岩的过渡型,它们分别占前寒武纪铜矿的34.4%、26.5%、20.6%及18.5%,未见夕卡岩型铜矿。矿化类型主要有Cu-Zn型、Cu-Co型、Cu-Ni-Co型、Cu-Pb-Zn型、Cu-Fe型及Cu-Mo型。未发现Cu-Au-U型(奥林匹克坝型)及太古宙的Cu-Ni-Pt型(与科马提岩有关)。成矿时代为新太古代-新元古代(2700~658Ma),且华北陆块中的铜矿主要形成于新太古代中元古代,而扬子陆块中的铜矿主要形成于古元古代-新元古代。
Precambrian is an important copper metallogenic epoch in China. Copper deposits formed in this period account for 24.4% of China's total copper reserves. Among them Proterozoic deposits make up 23.5% and Archean ones 0.9%. They are located in aulacogens on margins of Precambrian continental blocks. According to the protolith lithology of host rocks, copper deposits may be classified into sedimentary, volcanic, basic-ultrabasic and porphyry-volcanic transitional types, which constitute 34.4, 26.5, 30.6 and 18.5% of Precambrian copper deposits, respectively. Mineralizations mainly include Cu-Zn, Cu-Co, Cu-Pb-Zn, Cu-Fe, and Cu-Mo types. Up till now, Cu-Au-U type (Olympic Dam type) and Archean Cu-Ni-Pt type (related to komatiites) have not been found yet. Ore-forming processes lasted from Neoarchean to Neoproterozoic (2 700~658 Ma BP). Copper deposits in the North China block were mainly formed from Neoarchean to Mesoproterozoic, whereas those in the Yangtze block are mainly products of Paleoproterozoic-Neoproterozoic.
出处
《矿床地质》
CAS
CSCD
北大核心
2004年第S1期90-98,共9页
Mineral Deposits
基金
中国地质调查局地质调查项目(编号:K1.4-3-1)
关键词
铜矿
成矿作用
前寒武纪
中国
copper deposits, metallogenesis, Precambrian, China
