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本文论述了拉拉铜矿区钠长岩类的地质地球化学特征及变质变形与铜矿的形成。伴随前寒纪的构造运动 ,拉拉地区经历了NWW向的剪切变形 ,使钠长岩产生碎裂 糜棱岩化作用 ,形成碎裂结构、碎斑结构 ,显微眼球构造、压力影、云母鱼等。这些结构构造的形成使岩石孔隙度增加 ,起到扩容作用。由沿近东西向主断裂侵位的辉绿辉长岩体提供的含矿流体及区域变质中产生的变质热液沿钠长岩的碎裂 糜棱构造充填交代 ,在其产生多种蚀变的同时 ,铜、钼、钴硫化物沉淀成矿 ,形成钠长岩型浸染状铜矿石或脉状 网脉状铜矿石。在金云母化较强地段 ,在变质作用下 ,形成片岩型铜矿石。因而总体上 ,拉拉铜矿属动力变质热液型铜矿床。
This article discusses the geological geochemical characteristics and metamorphism and deformation of the albite in the Lara copper deposit and the formation of copper deposits. Along with the tectonic movement in the Precambrian, the Lala region experienced NWW shear deformation, causing the mylonitization of albite to form fragmentation, crustal structure, microscopic eyeball structure, pressure shadow, Mica fish and so on. The formation of these structural structures increases the porosity of rocks and plays a role of expansion. The ore-bearing fluids provided by the gabbro-gabbro bodies that have been emplaced along the east-west major faults and the metamorphic hydrothermal fluids generated during the metamorphism of the metamorphic rocks are metamorphosed along the fissured mylonites of the albite, At the same time, copper, molybdenum, cobalt sulfide precipitation mineralization, the formation of albite-type disseminated copper ore or vein network vein copper ore. In the phlogopite strong section, metamorphism, the formation of schist type copper ore. Therefore, Lara copper deposit belongs to the dynamic metamorphic hydrothermal copper deposit.