青海省成矿规律初探

    • 摘要: 青海省的矿产资源丰富,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-泥盆纪、石炭-二叠纪、三叠纪、第三纪及第四纪,成矿作用与三期(原、古、新)特提斯洋演化关系密切,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。所形成重要的优势金属矿产的矿床类型有: 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;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、造山型金矿床达到世界级大型—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。

       

      Abstract: Qinghai Province is rich in mineral resources, mainly nickel, gold, lithium, silver, copper, zinc, lead and other advantageous metal minerals, the formation of the age of the main Silurian-Devonian, Carboniferous-Permian, Triassic, Tertiary and Quaternary, the metallogenic effect and the three phases (proto-palaeo-palaeo-new) Tethys Ocean evolution is closely related to the complex mineralization of geological environments, the metallogenic effect of the multi-phase, multi-types, multiple sources of the characteristics of the mineralization. The types of deposits that form important dominant metal minerals are: ① magmatic copper-nickel-cobalt deposits; ② carbonate-type niobium deposits; ③ porphyry-silicate-type copper, molybdenum, lead and zinc; ④ orogenic-type gold deposits; ⑤ shallow-forming, low-temperature hydrothermal-type silver deposits; ⑥ spate-deposited (SEDEX)-type copper, lead-zinc and cobalt deposits; ⑦ Mississippi River Valley-type (MVT)-type lead-zinc deposits, etc., among which magmatic-type copper-nickel deposits, orogenic-type gold deposits reached World-class large-sized and super-large deposits. According to the geological background of their formation, they are divided into 13 secondary tectonic units and 6 metallogenic provinces, which have experienced tectonic evolution in 5 time periods.

       

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