东昆仑斑岩-热液成矿系统找矿实践——以乌兰乌珠尔-十字嵩矿床为例  

Prospecting Practice of Porphyry-Hydrothermal Metallogenic System in East Kunlun:A Case Study of the Wulanwuzhuer-Shizisong Deposit

作　　者：马忠元 李军 逯登军 韩生荣 赵建鹏 MA Zhongyuan;LI Jun;LU Dengjun;HAN Shengrong;ZHAO Jianpeng(The Third Institute of Qinghai Geological Prospecting,Xining,Qinghai 810029)

机构地区：[1]青海省第三地质勘查院,青海西宁810029

出　　处：《地质与勘探》2024年第4期700-711,共12页Geology and Exploration

基　　金：青海省“高端创新创业人才计划”项目“青藏高原北缘三叠纪斑岩铜多金属矿成矿作用研究”与青海省第三地质勘查院自筹科研项目(编号:SKYZC-2022-007)联合资助。

摘　　要：近年来,东昆仑成矿带西段的祁漫塔格地区新发现了乌兰乌珠尔-十字嵩大型银多金属矿床,矿区发育大面积晚古生代泥盆纪侵入花岗岩,岩性主要为似斑状二长花岗和二长花岗岩;矿区构造以北西向、近东西向为主,北北东、北东向次之,其中,北西向和近东西向断裂与成矿关系密切。紧邻乌兰乌珠尔-十字嵩矿区北部的乌兰乌珠尔矿区发现有斑岩脉体,岩性为花岗闪长斑岩和花岗斑岩。本区找矿突破是以斑岩成矿系统理论为指导,基于缺位找矿思路,通过分析地质资料和区域地球化学异常,在全面掌握前人工作程度的基础上,以野外斑岩脉旁侧发现的矿化构造蚀变带为突破口,类比国内及东昆仑成矿带碰撞造山环境斑岩成矿模式,建立斑岩-热液脉型矿床找矿模型,进而在勘查工作中发现银铅锌矿体,并建立了地质、地球化学测量、遥感、地球物理测量综合勘查标志,为区域上开展同类型矿床的找矿工作提供了思路和方向。The large Wulanwuzhuer-Shizisong Ag polymetallic deposit has been newly discovered in the Qimantage area of the western part of the East Kunlun metallogenic belt in recent years.The large area of the deposit is dominated by Palaeozoic Devonian intrusive granite,and the lithology is mainly porphyritic monzonitic granite and monzonitic granite.The structures in the deposit are mainly NW-trending and nearly EW-trending,followed by NNE-and NE-trending.The NW-and nearly EW-trending faults are closely related to the mineralization.Porphyry dykes were observed in the Wulanwuzhuer deposit,which is adjacent to the northern part of the Wulanwuzhuer-Shizisong deposit.The lithology of the prophyry dykes is dominated by granodiorite porphyry and granite porphyry.The prospecting breakthrough in this area is guided by the theory of porphyry metallogenic system and based on the idea of missing prospecting.Based on the analysis of geological data,regional geochemical anomalies and previous work,this work focused on the mineralized tectonic alteration belt beside the field porphyry veins.By comparing the porphyry metallogenic models for East Kunlun metallogenic belt and others in China under collisional orogenic environment,the prospecting model of porphyry-hydrothermal vein type deposits was established,and silver lead-zinc ore bodies were discovered.Comprehensive markers of geological,geochemical,remote sensing and geophysical exploration has been established,which will provide ideas and directions for the prospecting work of the same type of deposits in the region.

关 键 词：银多金属矿床 找矿实践 综合勘查标志 斑岩-热液成矿系统 乌兰乌珠尔-十字嵩 东昆仑 

分 类 号：P618.52[天文地球—矿床学]