湘西-黔东地区铅锌矿床找矿模型与定量预测  

Prospecting Model and Quantitative Prediction of Pb-Zn Deposits in Western Hunan and Eastern Guizhou

作　　者：李堃[1] 刘飞[1] 刘凯[1] 赵少瑞 汤朝阳[1] 段其发[1] Li Kun;Liu Fei;Liu Kai;Zhao Shaorui;Tang Zhaoyang;Duan Qifa(Wuhan Center,China Geological Survey,Wuhan 430205,China;Faculty of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430074,Chin)

机构地区：[1]中国地质调查局武汉地质调查中心,武汉430205 [2]中国地质大学(武汉)资源学院,武汉430074

出　　处：《吉林大学学报（地球科学版）》2020年第3期825-841,共17页Journal of Jilin University：Earth Science Edition

基　　金：中国地质调查局地质调查项目(1212011121100,DD20160034)。

摘　　要：湘西-黔东地区位于扬子陆块东南缘,已发现铅锌矿床(点)200余处,是中国重要铅锌资源战略接续区之一。对该地区铅锌矿床控矿因素与找矿标志的研究结果表明:铅锌矿床受地层、岩相、构造三者的综合控制,即特定的地层岩性组合、台地边缘中缓坡相、区域性断裂和背斜及次生或派生裂隙构造为主要控矿因素;含菱锌矿或褐铁矿的氧化露头,方解石化、黄铁矿化、重晶石化或沥青化等围岩蚀变,Pb、Zn、Cd、CaO、Hg单元素化探异常及Pb-Zn-Cd元素组合化探异常为该地区铅锌矿床的主要找矿标志。综合控矿因素与找矿标志研究结果,构建了研究区铅锌矿床的地质-地球化学找矿模型,并以此模型为基础,在GIS平台上利用特征分析法进行了综合信息矿产定量预测。根据研究区铅锌矿床预测单元联系度等值线图,圈定出A级找矿远景区2个和B级找矿远景区2个,提出松桃、镇远-铜仁、都匀-凯里地区应作为后续铅锌找矿勘查工作重点区。The western Hunan and eastern Guizhou are located in the southeast margin of the Yangtze craton,where more than 200 Pb-Zn deposits/occurrences are developed.It is one of the important successive strategic bases of Pb-Zn resources in China.In this district,a systematic study is conducted on ore controlling factors and prospecting indicators of Pb-Zn deposits.The Pb-Zn deposits are jointly controlled by stratum,lithofacies,and structures,specifically the lithology assemblages,middle shallow ramp facies,regional faults,anticline,secondary faults,and fractures.The important prospecting indicators of Pb-Zn deposits in this district mainly include oxidation outcrop containing limonite or smithsonite,hydrothermal alterations of calcilization,pyritization,baratization,and bituminization,Pb,Zn,Cd,CaO,Hg geochemical anomalies,and Pb-Zn-Cd combination geochemical anomaly.On the basis of the comprehensive analyses of controlling factors and prospecting indicators,the authors build a geological-geochemical regional prospecting model,which is helpful to conduct comprehensive quantitative prediction by using characteristic analysis method on the GIS platform.According to the prospecting probability contour map of Pb-Zn deposits,two first-class ore prospective areas and two second-class ore prospective areas are delineated.The authors suggest that Songtao,Zhenyuan-Tongren and Duyun-Kaili are the most potential areas for further exploration.

关 键 词：控矿因素 找矿标志 找矿模型 定量预测 铅锌矿床 湘西-黔东 

分 类 号：P612[天文地球—矿床学] P618.4[天文地球—地质学]