广东省大宝山斑岩型铜矿床勘查突破及其区域找矿意义  

A prospecting breakthrough and progress in the Dabaoshan porphyry copper deposit in Guangdong Province

作　　者：赵如意 王登红[2] 王要武[3] 陈毓川[2] 刘武生 张熊[3] 蒋金昌 刘战庆[4] 李挺杰 王兰根[3] 应立娟[2] ZHAO Ruyi;WANG Denghong;WANG Yaowu;CHEN Yuchuan;LIU Wusheng;ZHANG Xiong;JIANG Jinchang;LIU Zhanqing;LI Tingjie;WANG Langen;YING Lijuan(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013;MNR Key Laboratory of Metallogeny and Mineral Resource Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing,100037;Guangdong Province Dabaoshan Mining Co.,Ltd.,Shaoguan,Guangdong,512127;College of Earth Sciences,Guilin University of Technology,Guilin,Guangxi,541004)

机构地区：[1]东华理工大学核资源与环境国家重点实验室,南昌330013 [2]自然资源部成矿作用与资源评价重点实验室中国地质科学院矿产资源研究所,北京100037 [3]广东省大宝山矿业有限公司,广东韶关512127 [4]桂林理工大学地球科学学院,广西桂林541004

出　　处：《地质学报》2020年第1期204-216,共13页Acta Geologica Sinica

基　　金：中央级公益性科研院所基本科研业务费项目(编号JYYWF20183701、JYYWF20183704);中国地质调查局中国矿产地质志项目(编号DD20160346、DD20190379);大宝山矿床外围(深部)找矿方向研究(HE1806、HE1909)联合资助成果

摘　　要：接替资源勘查是广东省大宝山铜多金属矿近十五年的主题之一。本文在介绍矿床地质的基础上,回顾了大宝山英安斑岩中斑岩型铜矿的发现过程。陡倾细脉状石英硫化物是大宝山斑岩型铜矿的主要矿化形式,脉体倾向290°~310°,倾角65°~75°,脉幅主要为0.5~10mm,脉频平均约22条/m。通过查明英安斑岩与铜多金属矿化之间的关系,将勘探线方向调整为120°,钻孔尽可能大角度穿切石英硫化物脉体,成为斑岩型铜矿勘查取得突破的关键。大宝山英安斑岩墙是早侏罗世晚期(175Ma前后)沿大宝山逆冲推覆构造侵位的浅成岩,铜硫多金属矿化与之相关。铜矿化强度与(黄铁)绢英岩化、绢云母化和绿泥石化关系十分密切,蚀变分带较为发育,是特殊类型的斑岩铜矿。铜矿化品位主要为0.10%~0.60%,平均品位0.43%。250m高程以上的大宝山英安斑岩墙中,初步估算新增铜资源量可达大型规模,深部依然是其找矿主攻方向。在粤北-赣南地区,加强与英安斑岩相关的铜、铅、锌、金、银等多金属找矿勘查工作,有望在该区落实一个北东向斑岩型铜多金属成矿带。One of the major themes in the past 15 years is the succeeding resources prospecting in the Dabaoshan copper polymetallic mine in Guangdong Province.The geology,discovery,and prospecting history of the Dabaoshan porphyry copper deposits are reviewed in this paper.Steeply dipping fine-veined quartz sulfide is the main ore controlling factor of Dabaoshan porphyry copper deposit.The vein body inclinations are 290°~310°,the dip angles are 65°~75°,the width of the veins is 0.5~10 mm,and the average vein frequency is 22 pieces/m.A breakthrough in porphyry copper prospecting was achieved by adjusting the exploration line to 120°and drilling through the quartz sulfide vein at the greatest possible angle.The Dabaoshan dacite porphyry wall is an ultra-shallow magmatic rock which was emplaced along the Dabaoshan thrust nappe structure in the late early Jurassic(around 175 Ma).Copper mineralization intensity is closely related to beresitization of the phyllic zone,sericitization and chloritization of the porphyry copper deposit.Copper mineralization grade is 0.10%~0.60%,with an average grade of 0.43%.The copper resource can reach a large scale deposit in the Dabaoshan dacite wall at 250 m elevation.In the area fromnorth Guangdong Province tosouth Jiangxi Province a NE trending porphyry copper pollymetallic metallogenic belt related to the dacite porphyrycould beexpected where the Cu,Pb,Zn,Au,and Ag polymetallic prospecting can beundertaken.

关 键 词：大宝山矿床 逆冲推覆构造 斑岩型铜矿 突破与进展 绢英岩化 燕山期 

分 类 号：P618.41[天文地球—矿床学]