桂东大瑶山成矿带古木口金矿床地质特征及找矿方向  

Geological Characteristics and Prospecting Direction of the Gumukou Gold Deposit in the Dayaoshan Metallogenic Belt,Eastern Guangxi

作　　者：陈龙照 黄树峰[1,2] 郭腾飞 沈开和[1] 吴志山 魏明雨[1] 江化寨 詹勇 CHEN Longzhao;HUANG Shufeng;GUO Tengfei;SHEN Kaihe;WU Zhishan;WEI Mingyu;JIANG Huazhai;ZHAN Yong(The Second Geological Exploration Institute of China Metallurgical Geology Bureau,Fuzhou,Fujian 350108;Research Institute of Mineral Resources,China Metallurgical Geology Bureau,Beijing 101300)

机构地区：[1]中国冶金地质总局第二地质勘查院,福建福州350108 [2]中国冶金地质总局矿产资源研究院,北京101300

出　　处：《地质与勘探》2021年第5期1008-1016,共9页Geology and Exploration

基　　金：自然资源部中国地质调查局《广西贺州-梧州地区综合地质调查项目》(编号:DD20190826);广西恒镒矿业贸易有限公司委托勘查项目联合资助。

摘　　要：古木口金矿是在桂东大瑶山成矿带上发现的首例中型规模以上高品位金矿,其矿床类型属于中低温岩浆热液型。该金矿矿体呈似层状、脉状、透镜状产出,受断裂、成矿结构面及构造蚀变带控制,矿床在垂向和横向上具有石英脉型、破碎蚀变岩型及斑岩型分带特征。为及时总结矿区勘查新成果,推动该区找矿新突破,研究矿体与寒武系含碳细碎屑岩系、层间引张型走滑转换断裂、花岗闪长斑岩组合要素的空间关系,以及近矿围岩蚀变矿物组合标志、土壤化探异常等成矿综合信息;运用土壤地球化学测量及异常带槽探、钻探揭露等综合找矿方法,在总结分析了矿区地质-地球化学特征及矿化时空分布规律的基础上,提出了该区带的找矿方向。结果显示,该矿区深部及外围具有较好的找矿前景,特别是北西向断裂、引张型走滑转换断裂、伸展型脆-韧性剪切异常带利于寻找破碎带蚀变岩型富金矿,其构造相对封闭环境的深部是寻找斑岩型金矿的有利地段。The Gumukou gold deposit is a low-medium temperature magmatic hydrothermal gold mine.It is the first high-grade gold deposit of a medium scale in the Dayaoshan metallogenic belt in eastern Guangxi.The ore body of this deposit is like bedded,vein and lenticular,controlled by faults,metallogenic structural planes and structural alteration zones.The deposit has the characteristics of quartz vein type,fractured altered rock type and porphyry type zoning vertically and horizontally.In order to timely summarize the new exploration achievements in the mining area and promote new breakthroughs in prospecting in the area,this work studies the spatial relationship between the ore body and Cambrian carbonaceous fine clastic rock series,interlayer tension type strike-slip transform faults,granodiorite porphyry combination elements,as well as the comprehensive metallogenic information such as altered mineral assemblage marks of near ore surrounding rock and soil geochemical survey anomalies.Based on integrated prospecting methods such as soil geochemical survey,trenching of abnormal zones,drilling exposure,analysis of the geological and geochemical characteristics and temporal and spatial distribution of mineralization in the mining area,the future prospecting direction of the mining area is put forward.Research suggests that there are good prospecting prospects in the deep subsurface and periphery of the mining area,especially NW-trending faults and extensional strike-slip transform faults.The extensional brittle ductile shear anomaly zone is a favorable site for searching for rich gold deposits of altered rock type in the fractured zone and its relatively closed structural environment at depth is favorable for porphyry-type gold ore.

关 键 词：古木口金矿床 地质特征 找矿方向 大瑶山成矿带 桂东 

分 类 号：P618.51[天文地球—矿床学]