黔西北乐开铅锌矿床构造地球化学研究及深部找矿预测  

Tectono-geochemistry and deep prospecting prediction in the Lekai lead-zinc deposit, Northwestern Guizhou Province, China

作　　者：万新 韩润生[1] 李波[1] 肖宪国 何志威 王景腾 魏庆喜 WAN Xin;HAN Runsheng;LI Bo;XIAO Xianguo;HE Zhiwei;WANG Jingteng;WEI Qingxi(Southwest Institute of Geological Survey,Geological Survey Center for Non-ferrous Mineral Resources,Kunming 650093,Yunnan,China;Guiyang Mining Investment&Development Corporation.Ltd.,Guiyang 550002,Guizhou,China;Kunming Prospecting Design Institute of China Nonferrous Metals Industry Co.,Ltd.,Kunming 650051,Yunnan,China)

机构地区：[1]有色金属矿产地质调查中心西南地质调查所,云南昆明650093 [2]贵阳矿业开发投资股份有限公司,贵州贵阳550002 [3]中国有色金属工业昆明勘察设计研究院有限公司,云南昆明650051

出　　处：《中国地质》2022年第6期1875-1892,共18页Geology in China

基　　金：国家自然科学基金项目(41572060、U1133602);云岭学者项目(2014);大学企业合作项目(20160039);云南省矿产资源预测评价工程实验室(2010);云南省创新团队项目(2012)联合资助。

摘　　要：【研究目的】乐开铅锌矿床是近些年黔西北铅锌矿集区内新发现的矿床之一,与该矿集区内铅锌矿床主要受NW向断裂控制有所不同,乐开铅锌矿床严格受NE向断褶构造控制,与滇东北矿集区铅锌矿床具有一致的成矿地质条件。该研究对黔西北乐开地区乃至川滇黔接壤区铅锌矿深部找矿具有重要的指示意义。【研究方法】主要包括构造精细解析和构造地球化学等方法。【研究结果】该区控矿构造型式为典型的“多字型”和“入字型”,并划分出3种构造组合,分别代表4种不同的构造体系:海西期—印支中期(早SN构造带)、印支晚期—燕山早期(NE构造带)、燕山中晚期(NW构造带)及喜马拉雅期(晚SN构造带)。断裂构造岩主要表现为低温成矿阶段的前缘晕元素组合(SbAs-Hg)、中温成矿阶段的近矿晕元素组合(Zn-Pb-Cd)与中高温成矿阶段的尾晕元素组合(In-Sn-Ni-Cu)。【结论】NE构造带为该矿床的成矿构造体系,推断成矿流体在平面上自SW向NE向运移,提出矿区深部6个定位找矿靶区。This paper is the result of mineral exploration engineering.[Objective] The Lekai lead-zinc deposit, located in the Pb-Zn deposit concentration of northwestern Guizhou, is one of the smallscale lead-zinc deposits newly discovered in recent years. Different from most lead-zinc deposits in the Pb-Zn deposit concentration of northwestern Guizhou, the Lekai lead-zinc deposit is controlled strictly by NE trending fault-fold structure, which is similar to most lead-zinc deposits in the Pb-Zn deposit concentration of northeastern Yunnan. The current research provided significant implications for the deep exploration in the Lekai lead-zinc deposit and the Sichuan–Yunnan–Guizhou Triangle area(SYGT). [Methods] This study applied a large deal of detailed structural analysis on mechanical properties for faults and folds in the mining area and tectono-geochemistry method. [Results] The results showed that duo-type and λ-type are the main orecontrolling structural styles in this area. Moreover, three tectonic associations have been divided, which are correspond to four tectonic systems, namely Hercynian to Mid Indosinian, Late Indosinian to Early Yanshanian, Mid-Late Yanshanian, and Himalayan epochs. The trace elements concentrations of tectonites represented three element associations of principal factors, including frontal halo elements(Sb-As-Hg) in low temperature ore-forming stage, mineralization-halo elements(Zn-Pb-Cd) in medium-low temperature ore-forming stage, and tail-halo elements(In-Sn-Ni-Cu) in medium temperature ore-forming stage. [Conclusions]In four tectonic systems, ore-forming tectonic system corresponded with Late Indosinian to Early Yanshanian. According to anomaly features and their distribution regularities, the possible migration direction of ore-forming fluid is from southwest to northeast, and six target prospecting areas have been put forward in the depth of mining.

关 键 词：构造地球化学 异常梯度 深部找矿预测 矿床构造解析 乐开铅锌矿床 黔西北矿集区 矿产勘查工程 

分 类 号：P552[天文地球—构造地质学] P632[天文地球—地质学]