广西大瑶山西北地区构造分形与成矿预测  

Tectonic Fractal and Metallogenic Prediction in Northwest Dayao Mountain,Guangxi

作　　者：蒋超 李社宏[1] 付嵩 谢卓麟 廖红为 JIANG Chao;LI She-hong;FU Song;XIE Zhuo-lin;LIAO Hong-wei(College of Earth Science,Guilin University of Technology,Guilin,Guangxi 541004)

机构地区：[1]桂林理工大学地球科学学院,广西桂林541004

出　　处：《地球学报》2021年第4期515-527,共13页Acta Geoscientica Sinica

基　　金：广西自然科学基金项目(编号:2018GXNSFAA281260)资助。

摘　　要：本文针对大瑶山西北地区断层和石英脉热液型矿床丰富的特点,以及该区热液矿床成矿是否存在断裂构造分维临界线。采用较高标度的断裂构造分形分维分析(r=5~0.3125 km),研究矿体产状与矿区断裂产状的关系,结合Fry分析综合预测该区成矿潜力。研究区断裂构造分维值为D=1.6897,南北向断裂构造分维值D=1.2947,北东向断裂构造分维值D=1.4593,东西向断裂构造分维值D=1.0250,北西向断裂构造分维值D=1.2003。我们确定研究区热液矿床成矿存在断裂构造分维临界线,研究区成矿预测分维临界线为D=1.5000~1.8000,铅锌矿成矿预测分维临界线为D=1.6000~1.7400,铜矿成矿预测分维临界线为D=1.5000~1.7000,金矿成矿预测分维临界线为D=1.6400~1.8000,重晶石成矿预测分维临界线为D=1.6000~1.7400。矿体严格受到断裂构造的控制,主要的容矿构造为南北向和北东向断裂构造。综合分析后,我们认为该区铜矿床总体沿北东向分布,金矿沿南北向分布,铅锌矿沿南北向分布。按照矿产分布特征,我们预测了6个成矿靶区。This paper focuses on the characteristics of abundant faults and quartz vein type hydrothermal deposits in the northwest area of the Dayao Mountain and the problem as to whether there is a fractal boundary between the fault and the mineralization of hydrothermal deposits in this area.The fractal dimension analysis of fault structure with high scale(r=5~0.3125 km)was to study the relationship between orebody attitude and fault attitude in the mining area,and the metallogenic potential of the area was comprehensively predicted by Fey analysis.The fractal dimension of the fault structure in the study area D=1.6897,the fractal dimension value of NS-trending fault structure D=1.2947,the fractal dimension value of NS-trending fault structure D=1.4593,the fractal dimension value of EW-trending fault structure D=1.0250,and the fractal dimension value of NS-trending fault structure D=1.2003.It is held that there is a fractal boundary between fault structure and mineralization of the hydrothermal deposit in the study area,the fractal boundary of tectonic mineralization in the study area is D=1.5000~1.8000,the dividing line of lead-zinc mine tectonic mineralization is D=1.6000~1.7400,the dividing line of copper mine tectonic mineralization is D=1.5000~1.7000,the dividing line of gold mine tectonic mineralization is D=1.6400~1.8000,and the dividing line of barite tectonic mineralization is D=1.6000~1.7400.The orebody pattern is strictly controlled by faulting tectonics.The NE-trending and NS-trending faulting tectonics seem to be the main ore-hosting structure.Based on comprehensive analysis,it is considered that copper deposits are distributed in the north-east direction,whereas gold deposits and lead-zinc deposits are generally distributed in the north-south direction in this area. According to the characteristics of mineral distribution, the authors delineated six metallogenic prediction targets.

关 键 词：分形分维 Fry分析 成矿预测 

分 类 号：P548[天文地球—构造地质学] P617[天文地球—地质学]