湖北省蛇屋山金矿地质特征、控矿因素及成矿机制探讨

Analysis of Ore-controlling Factors and Metallogenic Mechanism ofShewushan Gold Deposit in Hubei Province

湖北省蛇屋山金矿自发现以来,矿床成因争议不断,直接影响着本区勘查方法和找矿工作的导向。通过对矿区的深入调查及对前人资料的重新认识,从区域地质背景及成矿地质条件、金矿床的地球化学特征、金矿化特征等方面入手,对矿床的控矿因素及成矿机制进行探讨,进一步总结成矿地质规律。研究认为印支期—燕山早期近东西向断裂与燕山晚期叠加的一系列北东向断裂共同形成本区独特的构造断块(片)格局,区内金矿化与多期次构造有关,多期次构造复合部位及附近容矿构造为有利的成矿地段;中更新世的表生风化作用对已形成的原生金矿体进行了改造。蛇屋山金矿为中低温热液成矿的卡林型金矿。

Since the discovery of Shewushan gold deposit in Hubei Province,the origin of the deposit has been controversial,which directly affects the exploration method and the direction of prospecting work in this area.Based on the deep investigation of the mining area and the re-understanding of the previous data,this paper discusses the ore-controlling factors and metallogenic mechanism of the deposit from the aspects of regional geological background and metallogenic geological conditions,geochemical characteristics of gold deposits and gold mineralization characteristics,and further summarizes the metallogenic geological laws.It is considered that the Indochina-Yanshan early near-easterly faults and a series of NE faults superimposed in the late Yanshanian period form a unique tectonic fault block(sheet)pattern in this area,and the gold mineralization in this area is related to the multi-stage sub-structures.The Mesopocene epigen weathering transformed the formed primary gold orebody.Shewushan gold deposit is a low-temperature hydrothermal karin type gold deposit.