桂北全州县里出元矿区脆-韧性剪切带的发现及其找矿意义  

Discovery of brittle-ductile shear zone in Lichuan mining area of Quanzhou County in northern Guangxi and its prospecting significance

作　　者：刘云 周守余 李莉 徐文杰 蒙有言 蒙成禹 陈晓锋 LIU Yun;ZHOU Shouyu;LI Li;XU Wenjie;MENG Youyan;MENG Chengyu;CHEN Xiaofeng(Hunan HengJu exploration Co.,Ltd.,Huaihua 418000,Hunan China;China Nonferrous Metal(Guilin)Geology and Mining Co.,Ltd.,Guilin 541004,Guangxi,China;Guilin University of Technology Guilin 541004,Guangxi,China)

机构地区：[1]湖南恒炬勘查有限公司,湖南怀化418000 [2]中国有色桂林矿产地质研究院有限公司,广西桂林541004 [3]桂林理工大学,广西桂林541004

出　　处：《矿产勘查》2021年第10期2035-2042,共8页Mineral Exploration

基　　金：广西壮族自治区自然资源厅2019—2020年地质科研项目“桂北金矿成矿规律与找矿前景研究”(桂自然资函〔2019〕2403号);中国有色集团科技计划项目“中国有色矿业集团矿山资源现状调查与找矿潜力分析”(2019KJJH02)联合资助。

摘　　要：全州县里出元金矿发育于奥陶系浅变质的碎屑岩系内,区内断裂构造发育。经过地质调查在矿区发现Ⅰ号、Ⅱ号和Ⅲ号3条NE走向的脆-韧性剪切带,沿剪切带发育金矿化,Au品位为0.8×10^(-6)~2.34×10^(-6),潜在Au金属量约4 t。通过系统的野外调查和镜下鉴定确定Ⅰ号矿化带为脆性剪切带,Ⅱ号和Ⅲ号矿化带为脆-韧性剪切带,发育典型证明脆-韧性剪切带特征:带状石英、石英的波状消光、S-C组构和旋转残斑,上述发现对指导桂北地区实现金矿找矿突破具有现实的指导意义。The Lichuayuan gold deposit in Quanzhou County is developed in the Ordovician low metamorphic clastic rock series,and fault structures are developed in the area.Through geological survey,three NE trending brittle-ductile shear zones Ⅰ, Ⅱ and Ⅲ were found in the mining area.Gold mineralization developed along the shear zone,with gold content of 0.8×10^(-6)~2.34×10^(-6) and potential gold resources of about 4t.Through systematic field investigation and microscopic identification,No.Ⅰ is identified as brittle shear zone,No.Ⅱ and No.Ⅲ mineralization zones are identified as brittle-ductile shear zone.The typical development of brittleductile shear zone proves the existence of evidence:banded quartz,wavy extinction of quartz,S-C fabric and rotational remnant.The above findings have practical significance for guiding the realization of gold prospecting breakthrough in northern Guangxi.

关 键 词：脆-韧性剪切带 金矿 地质调查工程 里出元 

分 类 号：P624.6[天文地球—地质矿产勘探]