青海江里沟钨多金属矿成矿控制因素及矿化富集规律

青海江里沟钨多金属矿床目前是青海境内规模最大的钨矿床,其规模达中-大型,大地构造位置属秦祁昆复合造山系秦岭造山带西段。本文从江里沟钨多金属矿床的成矿地质背景、矿区地质特征、矿体特征等方面入手,总结矿床控矿因素及矿化富集规律。矿体受岗察复式花岗岩体与围岩接触带控制,矿化围绕岩体具有明显的分带性,自岩体向外形成了斑岩型钼矿化-云英岩型钨矿-矽卡岩型钨铜钼矿-角岩型钨矿-脉状铅锌矿的矿化系列,以矽卡岩型为主要类型。其矿床成因为与晚三叠世江里沟复式花岗岩体晚阶段花岗斑岩和细粒花岗岩的侵入及岩浆后期热液有关的多位一体矿床,为下一步的找矿提供依据。

Controlling factors and mineralization enrichment of the Jiangligou tungsten polymetallic deposit in Qinghai Province

The Jiangligou tungsten polymetallic deposit is the largest tungsten deposit in Qinghai at present, which has reached a medium-large deposit scale. It is structurally located at the west Qinling orogenic belt of Qinling-Qilian-Kunlun composite orogenic system. This work summarized the ore-controlling factors and mineralization enrichment regularity of this deposit based on the metallogenic geological setting, geological characteristics, orebody characteristics. The orebodies are controlled by the contact zone between the Gangcha composite granite body and the surrounding rocks. The mineralization shows significant vertical zonation around the rock mass, i.e., porphyry type molybdenum, greisen type tungsten, skarn type copper-wolfram-molybdenum, hornfels type tungsten and hydrothermal vein lead-zinc from the granite body to surrounding rocks, and the dominate type is skarn type. The genesis of deposit is multinity which related to the intrusion of late stage granite porphyry and fine-grained granite of the Jiangligou composite granite in Late Triassic and late magmatic hydrothermal solution. This work may provide basis for the next step prospecting.