西大明山银铅锌金钨铋矿地质特征、成矿规律及成矿模式

摘要

文章简要介绍了广西西大明山地区的地质背景及银矿床、铅锌矿床、钨铋矿床、银铅锌金矿床地质特征,初步分析、总结和探讨了该区银铅锌金钨铋矿床的成矿规律,认为该区赋矿层位主要为寒武系,次为下泥盆统莲花山组,成矿物质来源于寒武系、下泥盆统岩层及深部岩浆岩,银铅锌等矿床导矿控矿主要为 EW 向、NE 向断裂,EW 向、NE 向及其次级断裂为主要控矿容矿断裂,层控蚀变岩型钨铋矿受层位、岩性及褶皱构造控制明显,成矿与含钙层位关系密切,具多期成矿作用,成矿时代主要为燕山期,并提出该区银铅锌金钨铋矿成矿模式,指出银铅锌金钨铋矿的找矿方向,对该区今后的地质找矿工作具有一定的指导意义。%This paper introduced the geological setting of Xidamingshan area in Guangxi and the geological characteristics of Ag deposit,Pb-Zn deposit,W-Bi deposit and Ag-Pb-Zn-Au-W-Bi deposit.Based on the ini-tial analysis and summary on metallogenic regularity of Ag-Pb-Zn-Au-W-Bi deposits in this area,it is be-lieved that the ore-bearing horizons in this area are predominantly in Cambrian System and subordinately in Lianhuashan Formation of Lower Devonian Series.The ore-forming materials originate from rock beds of Cambrian System and Lower Devonian Series and magmatic rocks of deep parts.Ag,Pb and Zn deposits are controlled by EW and NE-trending faults,and the EW and NE-trending faults and their secondary faults are the primary ore-controlling and ore-transmitting faults.The stratabound altered rock type W-Bi deposits are obviously controlled by horizons,lithology and folded structure.The mineralization is closely related to cal-cium-bearing horizons and is characterized by multi-stage mineralization and occurs in Yanshanian Epoch. This paper concluded the metallogenic model of Ag-Pb-Zn-Au-W-Bi deposits in this area and the prospecting direction of Ag-Pb-Zn-Au-W-Bi deposits.They can be used as guidance in future geological prospecting works in the area.