风火山地区铜矿床特征及成因研究

Genesis and Characteristics of Copper Deposits in Fenghuoshan Mountains

风火山地区铜矿床位于我国著名的“三江”有色和贵金属成矿带的西段,以往地质工作程度较低,从而影响了人们对该矿床成矿环境及成因的认识。近年来,随着地勘工作特别是地质大调查资源评价工作的深入开展,初步查明了区内风火山群沉积环境、沉积序列及含矿层位,建立了构造格架及构造变形序列。笔者根据野外实践,对该矿床特征及矿床成因进行了分析和总结,认为风火山铜矿床属于砂岩型铜矿床,构成砂岩型铜矿的各铜矿化带,均呈夹层产于风火山群砂泥岩中,含矿层岩性均为浅灰—灰绿色厚—中厚层状细粒(含砾)岩屑石英砂岩夹深灰色薄层碳质泥岩。整个风火山成矿带上各矿化带的形态、矿化体特征基本一致,均呈层状产出。

Copper deposits of the Fenghuoshan area geologically occur in the western portion of the Sanjiang nonferrous and noble metal mineralizatin belt, which is well known in China. The previous backward work hinders the study of the mineralization settings and genesis of the deposits. Recently, as geological survey and mineral resource exploration are carried out, some general geological information has become clear. As a result, sedimentary circumstances of the Fenghuoshan group, its sequences and the ore-bearing strata as well as the deformation sequences have been determined. Based on field work, we have analyzed the characteristics and genesis of the copper deposits. It is suggested that the Fenghuoshan copper deposits are hosted by sandstones, the ore bodies usually appear in grey and thick to intermediate thick , fine-grained quartz lithic sandstones intercalating with thin carbonaceous mudstones.