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东沟斑岩钼矿形成于(116.5±1.7)~(115.5±1.7)Ma左右,其主要容矿围岩为中元古代熊耳群安山岩,而与成矿有关的为形成于中生代的东沟花岗斑岩。位于东沟花岗斑岩体西南部10km的太山庙花岗岩基与东沟花岗斑岩体岩石学及地球化学特征相似且成岩年龄基本趋于一致,表明东沟花岗斑岩可能为太山庙岩体的分支或岩浆晚期结晶分异的产物。东沟斑岩钼矿的成矿过程,主要分为三个阶段:成矿早期、主要成矿期及成矿晚期。其中,主要成矿期由两阶段组成,且由磷灰石富集脉分隔。
The Donggou porphyry molybdenum deposit is formed in the range of (116.5 ± 1.7) ~ (115.5 ± 1.7) Ma. The main ore-bearing wall rock is the Paleoproterozoic andesite of the Xiong’er Group. The mineralization is related to the formation of Mesozoic Donggouhua Porphyry. The Taishanmiao granite base and the Donggou granite porphyry in the southwestern part of the Donggou granite porphyry body have similar petrological and geochemical characteristics and the diagenetic age basically agrees with each other, indicating that the Donggou granite porphyry may be too The branch of the Shanmiao rock mass or the product of the late crystallization of the magma. Donggou porphyry molybdenum mineralization process is divided into three stages: the early metallogenic stage, the main metallogenic stage and the late stage of mineralization. Among them, the main metallogenic stage consists of two phases and is separated by apatite-rich veins.