鄂东南张海金矿床控矿因素及找矿潜力分析  

Ore-controlling factors and prospecting potential in Zhanghai Gold Deposit,southeastern Hubei

作　　者：罗恒 李欢[3] 戴进玲 徐江嬿 陈松林 许杨 孙芳 Luo Heng;Li Huan;Dai Jinling;Xu Jiangyan;Chen Songlin;Xu Yang;Sun Fang(Central South Geological Survey Institute of China Metallurgical Geology Bureau;Mineral Resources Research Institute of China Metallurgical Geology Bureau;Faculty of Earth Resources,China University of Geosciences(Wuhan);Hubei Geological Exploration Fund Management Center)

机构地区：[1]中国冶金地质总局中南地质调查院,武汉市430081 [2]中国冶金地质总局矿产资源研究院 [3]中国地质大学(武汉)资源学院 [4]湖北省地质勘查基金管理中心

出　　处：《黄金》2021年第10期8-15,共8页Gold

基　　金：中央财政项目(DD20160050-029);湖北省地质勘查基金项目(鄂地勘基金〔2019〕19号);湖北省财政项目(〔2016〕29,〔2017〕2,〔2018〕17)。

摘　　要：张海金矿床位于长江中下游鄂东南矿集区殷祖岩体东南缘,为赋存于沉积岩中的浸染型金矿床。赋矿围岩为志留系下统新滩组含碳质粉砂岩及页岩,金矿体产于殷祖复式背斜核部附近次级北东东向断裂、裂隙和破碎带中,呈脉状、似层状、透镜状产出,总体走向北东东,倾向南南东,倾角30°~60°,走向和倾向最大延伸分别为640 m和688 m,上下盘普遍发育闪长玢岩。金矿石类型主要为浸染状和细(网)脉状含金粉砂岩-页岩型,硅化、黄铁矿化、毒砂化等蚀变与金成矿关系密切。综合分析控矿因素认为,该矿床是具备高金背景、还原环境、含碳质物、相对封闭等特征的地层,背斜核部次级北东东向断裂、裂隙及破碎带,闪长玢岩岩浆活动三者共同作用下的产物,为岩浆热液系统远端浸染型金矿床。对矿区及外围找矿潜力进行评价,分别在张海金矿区和美人尖-张海-凤头金矿带提出6个重要找矿方向,为区域金矿勘查提供了新的工作思路。The Zhanghai Gold Deposit is located in the southeast margin of Yinzu pluton in the high ore concentration area of southeastern Hubei,in the middle lower reaches of Yangtze River,and is a disseminated gold deposit occurring in sedimentary rocks.The host rock is carbonaceous siltstone and shale of the Xintan Formation of Lower Silurian.The gold ore bodies occurs as vein,stratiform and lenticular shape in secondary NEE-trending faults,fissures and fracture zones near the core of Yinzu complex anticline which strikes NEE and inclines SSE,with dip angles of 30°-60°and the maximum length and vertical depth of 640 m and 688 m respectively.Diorite porphyry is widely developed in the upper and lower walls.The main types of gold ore are disseminated and veinlet(stockwork)gold-bearing siltstone-shale type.Silicification,pyritization and arsenopyrite alteration are closely related to gold mineralization.Based on the comprehensive analysis of ore-controlling factors,it is considered that the gold deposit is controlled by strata with high gold background,reducing environment,content of carbonaceous minerals,relatively closed and other characteristics,secondary NEE-trending faults,fissures and fracture zones in the core of anticline,and diorite porphyry magmatism,and belongs to disseminated gold deposit in the distal part of magmatic hydrothermal system.The paper evaluates the prospecting potential of the Zhanghai Gold District and its periphery,and puts forward 6 important prospecting directions in Zhanghai Gold District and the Meirenjian-Zhanghai-Fengtou gold metallogenic belt,which provides a new idea for regional gold exploration.

关 键 词：控矿因素 找矿潜力 斑岩-矽卡岩型铜金矿化 远端浸染型金矿化 张海金矿床 

分 类 号：TD11[矿业工程—矿山地质测量] P618.51[天文地球—矿床学]