西藏查个勒铅锌矿床成矿时代研究及地质意义

Geochronology of the Chagele Pb-Zn deposit in Tibet and its significance

摘要: 提要：查个勒铅锌矿位于冈底斯—念青唐古拉成矿带西段。矿体受花岗斑岩岩体形态及北东向、北西向断裂控制，产于岩体接触带与断裂破碎带中，属于典型的矽卡岩型矿床。花岗斑岩的锆石ICP-MS U-Pb年龄加权平均值为（63.18±0.77）Ma，岩石具有重熔型花岗岩地球化学特征，形成于碰撞环境。初步研究表明，查个勒铅锌矿床的形成与印—亚大陆碰撞有关，形成于印度大陆陡俯冲的主碰撞阶段。

Abstract: Abstract：The Chagele Pb-Zn deposit is located in western Gandise-Nyainqentanglha metallogenic belt. Ore bodies are produced in the contact zone and rock fracture zones and controlled by the shape of granite porphyry and NE-NW trending faults, suggesting a typical skarn deposit. Zircon ICP-MS U-Pb weighted average age of granite porphyry is 63.18Ma ± 0.77Ma, and the geochemical characteristics of the rocks indicate melting-type granite formed in the collision environment. Preliminary studies show that the Chagele Pb-Zn deposit was genetically related to the collision of India–Asia continent and was formed at the main collision stage of steep subduction of Indian continent.