青海省成矿规律初探

    The metallogenetic pattern of Qinghai Province

    • 摘要:
      研究目的 对青海省成矿规律目前尚未进行系统总结,青海省成矿规律和特征不明。
      研究方法 在收集前人资料的基础上,系统总结了青海省主要矿床时空分布的特点和成矿规律,建立了青海省主要矿产的成矿模式。
      研究结果 青海省矿产资源丰富,主要有镍、金、锂、银、铜、锌、铅等优势金属矿产。其形成时代主要为志留纪—泥盆纪、石炭纪—二叠纪、三叠纪、古近纪、新近纪及第四纪,形成的重要金属矿床类型有:①岩浆型铜镍钴矿床;②碳酸岩型铌矿床;③斑岩-矽卡岩型铜钼铅锌矿床;④造山型金矿床;⑤浅成低温热液型银矿床;⑥喷流沉积(SEDEX)型铜铅锌钴矿床;⑦密西西比河谷型(MVT)铅锌矿床等,其中岩浆型铜镍矿床、造山型金矿床发育世界级大型—超大型矿床。根据其形成的地质背景,划分了13个二级构造单元和6个成矿省,经历了5个时间段的构造演化。
      结论 青海省经历了3期(原、古、新)特提斯洋演化与成矿作用,具复杂的成矿地质环境,成矿作用具多期次、多类型、多矿源的特征。

       

      Abstract:
      Objective It is poorly studied regarding the metallogenic patterns of Qinghai Province, and the metallogenic laws and characteristics of Qinghai Province are unknown.
      Methods Based on the collection of previous data, this paper systematically summarizes the characteristics of the spatial and temporal distribution of the major mineral deposits in Qinghai Province and the metallogenetic pattern, and establishes the metallogenetic pattern of the major minerals in Qinghai Province.
      Results Qinghai Province is famous for its abundant mineral resources, mainly including Ni, Au, Li, Ag, Cu, Zn and Pb, all of which are superior metal minerals. The mineralization mainly occurred in Silurian−Devonian, Carboniferous−Permian, Triassic, Paleogene, Neogene and Quaternary. The types of ore deposits that form main superior metal minerals include magmatic Cu−Ni−Co deposits, carbonatite−type Nb deposits, porphyry−skarn−type Cu−Mo−Pb−Zn deposits, orogenic−type Au deposits, epithermal Ag deposits, sedimentary exhalative (SEDEX) Cu−Pb−Zn−Co deposits, and Mississippi Valley Type (MVT) Pb−Zn deposits. Among these deposits, among which magmatic Cu−Ni deposits and orogenic−type Au deposits reached world−class large and super−large deposits. According to the geological environments of their formation, they are divided into 13 secondary tectonic units and 6 metallogenic provinces, which experienced the tectonic evolution of five periods.
      Conclusions The formation of mineral deposits, which were closely related to the evolution of Proto−, Paleo− and Neo−Tethys Oceans, These deposits formed under complex environments characterized by the metallogeny of multiple−stages, multiple ore types, and multiple sources of ore−forming materials.

       

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