基于构造变形岩相带的覆盖区化探资料解释与找矿应用:以广西金秀镍钴多金属矿田为例  

Interpretations of Geochemical Exploration Data in Overburden Area Based on Tectonic Deformation lithofacies Belt and Their Applications:A Case Study of the Jinxiu Nickel-Cobalt Polymetallic Ore Field in Guangxi,China

作　　者：张宝林[1,2,3] 吕古贤 沈晓丽[5] 张壮 曹明坚 黄新硕 苏艳平[7] 贾文臣 ZHANG Baoin;LYUGuxian;SHEN Xiaoi;ZHANG Zhuang;CAO Mingjian;HUANG Xinshuo;SU Yanping;JIA Wenchen(Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing100029,China;Innovation Academy for Earth Science,CAS,Beijing100029,China;University of Chinese Academy of Sciences,Beijing100049,China;Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing100081,China;School of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao,Shandong266590,China;Chifeng Chaihulanzi Gold Mining CoLtd,Chifeng,Inner Mongolia024005,China;College of Ecology,Resources and Environment,Dezhou University,Dezhou,Shandong253023,China;Beijing Technology Consulting Branch,China Railway Resources Group CoLtd,Beijing100070,China)

机构地区：[1]中国科学院矿产资源研究重点实验室,中国科学院地质与地球物理研究所,北京100029 [2]中国科学院地球科学研究院,北京100029 [3]中国科学院大学,北京100049 [4]中国地质科学院地质力学研究所,北京100081 [5]山东科技大学地球科学与工程学院,山东青岛266590 [6]赤峰柴胡栏子黄金矿业有限公司,内蒙古赤峰024005 [7]德州学院生态与资源环境学院,山东德州253023 [8]中铁资源集团有限公司北京技术咨询分公司,北京100070

出　　处：《现代地质》2024年第4期934-946,共13页Geoscience

基　　金：科技部国家重点研发计划项目专题(2022YFC2903503);中国科学院知识创新工程重要方向项目(KZCX2-YW-Q04-03);中国科学院地质与地球物理研究所自主创新项目(31351460);山东省自然科学基金项目(ZR2020QD030);内蒙古自治区地质勘查基金管理中心科研项目(2019-KY02);云南伟力达地球物理勘测有限公司科研项目(51650930);四川恒康矿业有限公司科研项目(51741170)。

摘　　要：覆盖区化探资料复杂,解释难度大,亟须加强构造控矿要素方面的约束。不同类型覆盖区的构造形迹出露程度差别很大,因此需要从多个级别的构造体系中提取含矿构造变形岩相带的分布信息。本文提出基于地质力学构造体系阶段性演化特征判别覆盖区有利含矿构造走向,解译化探资料的成矿信息,以快速圈定找矿靶区的新思路。首先,从已知的地质、遥感和物探资料中解译出矿田的构造形迹和热液矿床的成矿信息;其次,依据成矿期的构造应力场特征确定主应力方向;第三,将张扭性和张性构造变形岩相带作为有利的含矿构造;最后,根据数据处理结果确定找矿异常区。将上述方法应用在广西金秀镍钴多金属矿田,确定了两个主要的含矿构造方向,即NWW—EW—NEE向断裂和NW—NNW向断裂,它们的形成时期不同,分别控制富砷化物型和富硫化物型的镍钴多金属矿脉。该方法和找矿思路可在覆盖区矿产资源勘查工作中进一步推广。The geochemical exploration data in covered areas are complicated and challenging to interpret,therefore,calling for strengthened constraints on structural ore-controlling factors.The outcroping extent of tec-tonic traces in various types of overlying areas varies,making it essential to extract distribution information of ore-bearing tectonic deformation lithofacies belts from multiple levels of the tectonic systems.Based on the evo-lutionary characteristics of the geomechanical tectonic system,a novel approach is proposed to identify favorable ore-bearing structure trends in overlying area,and to interpret metallogeny from geochemical exploration data,and to delineate prospecting more efficiently target areas.Firstly,the structural traces of ore field and the met-allogeny of hydrothermal deposits are interpreted using known geological,remote sensing,and geophysical da-ta.Secondly,the direction of principal stress can be determined based on the characteristics of the tectonic stress field during the mineralization period.Thirdly,the tensional-shear and tensional-tectonic deformation lithofacies belts can be identified as favorable ore-bearing structures.Finally,based on the data processing re-sults,the anomalous area for ore prospecting is identified.This method has been applied to the Jinxiu nickel-cobalt polymetallic ore field in Guangxi,identifying two main ore-bearing structural directions.The NWW-EW-NEE and NW-NNW trending fractures were formed in different periods.These fractures controlled nickel-cobalt polymetallic veins enriched in arsenide and sulfide,respectively.This method and prospecting approach can be further promoted in mineral exploration in covered areas.

关 键 词：覆盖区 地球化学勘查 构造变形岩相 构造体系 找矿预测 广西金秀 

分 类 号：P552[天文地球—构造地质学] P613[天文地球—地质学] P622.3