河南公峪石英脉型金矿地质特征及应力场分析

Characteristics of Gongyu quartz vein gold deposit and analysis of tectonic stress field,Henan

公峪金矿位于河南省祁雨沟隐爆角砾岩型金矿床的外围 ,为石英脉型金矿床 ,矿脉沿 NNE、NE、 NEE向断裂构造发育。矿石中金属矿物除黄铁矿、自然金、黄铜矿、方铅矿外 ,还出现少量碲铋矿、辉碲铋矿、硫铋铅铜矿等含铋矿物 ;矿石中微量元素除 Au外 ,还含有较多的 Cu、Pb、Ag,与隐爆角砾岩型金矿床成分特征一致。构造应力场研究表明 ,燕山期以来 ,在矿区表现较强的应力场主要有 3期 ,分别为早期近 EW向挤压、中期 NNW向挤压和晚期 NE向挤压 ,而矿脉产状所反映的应力场与 NE向挤压的构造应力场吻合。

Gongyu quartz vein gold deposit is located around Qiyugou explosion breccia type gold deposit, Henan province. The Au quartz veins extent along NN E, NE and NEE trending fractures. Besides of Pyrite, native gold, chalcopyrite, galena, there are a few of Bi bearing minerals e.g. tellurbimuth, tetradymite, larosite in the ore. Except for Au, the ore contain large amount of trace elements such as Cu, Pb, Ag, that is similar to that of explosion breccia type gold deposit. Tectonic stress field analysis indicates that in the gold field, there are 3 strong tectonic stress field stages after Yanshanian stage, namely, the early stage of EW trending compression, the middle stage of NNW trending compression and the late stage of NE trending compression. The stress field reflected by the attitude of the Au quartz vein is similar to the late stage of EW trending compression.