桂西隆林-西林锑金矿集区成矿控制因素探讨  

Discussion on the ore-controlling factors in the Longlin–Xilin Sb–Au mining district of western Guangxi,South China

作　　者：刘小虎 王新宇 肖昌浩 张文高[2,5,6] 刘向冲 于萍萍 毛承安 付伟 LIU Xiaohu;WANG Xinyu;XIAO Changhao;ZHANG Wengao;LIU Xiangchong;YU Pingping;MAO Cheng’an;FU Wei(Department of Earth Sciences,Guilin University of Technology,Guilin 541004,Guangxi,China;Laboratory of Dynamic Diagenesis and Metallogenesis,Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources in Guangxi,Guilin 541004,Guangxi,China;Guangxi Institute of Geological Survey,Nanning 530023,Guangxi,China;Key Laboratory of Paleomagnetism and Tectonic Reconstruction,Ministry of Natural Resources,Beijing 100081,China;SinoProbe Laboratory,Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100094,China;Geological Team No.4 of Guangxi Zhuang Autonomic Region,Nanning 530031,Guangxi,China)

机构地区：[1]桂林理工大学地球科学学院,广西桂林541004 [2]中国地质科学院地质力学研究所动力成岩成矿实验室,北京100081 [3]有色金属矿产勘查与资源高效利用省部共建协同创新中心,广西桂林541004 [4]广西壮族自治区地质调查院,广西南宁530023 [5]自然资源部古地磁与古构造重建重点实验室,北京100081 [6]自然资源部深地科学与探测技术实验室,北京100094 [7]广西壮族自治区第四地质队,广西南宁530031

出　　处：《地质力学学报》2024年第3期427-442,共16页Journal of Geomechanics

基　　金：中国地质调查局地质调查项目(DD20240127,DD20230344,DD20230293);广西地矿局部门前期找矿选点项目(桂地矿地[2021]68号-8);中国地质科学院地质力学研究所基本科研业务费项目(DZLXJK202203)。

摘　　要：华南锑成矿省锑资源储量占全国83%以上,位于成矿省西南部的滇黔桂锑矿带是华南锑成矿省的重要组成部分。文章以滇黔桂锑矿带中部桂西隆林-西林锑金矿集区为例,系统分析了区内82个矿床(点)的赋矿层位、赋矿围岩岩性、容矿构造特征及锑、金矿床共伴生关系,结合3个典型矿床调查及岩浆岩时空分布,探讨锑成矿作用与碎屑岩、岩浆岩的成因联系。研究结果表明:具有高锑背景值的炭质泥页岩和富黄铁矿砂岩是研究区锑成矿的有利岩性,为锑成矿提供了物质来源。岩浆作用对锑成矿既可以起到直接作用(Sb和S来源)也可以起到间接作用(热源),两者均有利于锑矿床的形成。容矿构造分析显示研究区经历了印支期南北向挤压,随后叠加中晚侏罗世北西—南东向挤压。北西西—南东东向和北东—南西向断裂及其交汇处是有利的容矿空间。隆林-西林矿集区锑、金矿床统计显示,区内以独立的锑、金矿床为主,暗示研究区锑、金成矿流体可能多为不同来源流体。在上述研究基础上,文章提出桂西隆林-西林锑金矿集区勘查有利区域:新州背斜核部下泥盆统郁江组炭质泥页岩和富黄铁矿粉砂岩是锑矿勘查的重点层位;隆林县弄桑-石家寨北西西—南东东向断裂带内隐伏岩体周边和西林县北西西—南东东向斗皇-西林断裂与北东—南西向断裂的交汇部位是锑矿勘查的有利区域。以上成果为研究区内锑金矿床成因和成矿规律认识提供新的思考,为区内锑矿床勘查提供方向。[Objective]Sb deposits are characterized by simple mineral assemblage.The ore-forming ages,sources of oreforming materials,and genesis of Sb deposits are controversial owing to the absence of suitable minerals for analysis.Sb resources in the South China Sb metallogenic region account for over 83%of the national total,with the Dian–Qian–Gui Sb belt in the southwest being an significant component of this region.[Methods]Taking the Longlin–Xilin Sb–Au mining district of western Guixi in the central part of the Dian–Qian–Gui Sb belt as an example,this paper systematically summarizes the ore-bearing strata,lithology of ore-bearing wall rocks,ore-bearing structures,and the coexistence relationship of Au and Sb deposits in 86 ore deposits(points)in the area.Combined with the geological characteristics of three typical deposits(Maxiong,Longtan,and Mahao)and the spatiotemporal distribution of Jurassic felsic intrusions,the inherent connection between Sb mineralization and clastic rocks and felsic intrusions was explored.[Results](1)Statistics and field works show that the most favorable ore-bearing stratum in the Longlin–Xilin mining district is the Lower Devonian Yujian Formation(D1y),followed by the Lower Triassic Luolou Formation(T1Ll)and the Middle Triassic Banna Formation(T2b).The lithologies most conducive to mineralization are carbonaceous shale,pyrite-rich sandstone,and siltstone.The Sb content in these strata or lithologies is tens or even hundreds of times higher than the crustal abundance,which has the potential for Sb mineralization.(2)Within the NWW–SEE trending Nongsang–Shijiazhai fault zone in the Longlin area,the middle and late Jurassic felsic intrusions,which have consistent spatiotemporal occurrences with Sb and Au deposits,can directly contribute to antimony mineralization(as sources of Sb and S)and indirectly influence it(as a heat source),both favoring the formation of antimony deposits.(3)Statistical results show that Sb,Au,and Sb–Au deposits account for 48%,46%,and 6%in the Lon

关 键 词：锑成矿物质来源 锑金共存关系 晚侏罗世长英质岩脉 隆林-西林矿集区 滇黔桂锑矿带 华南 

分 类 号：P611[天文地球—矿床学] P612[天文地球—地质学]