西秦岭尹家坪金矿地质特征及矿床成因

尹家坪金矿位于西秦岭褶皱系南秦岭印支褶皱带北缘,矿体赋存于海西—印支期侵入的闪长岩岩体及围岩接触部位。文章分析了尹家坪金矿体产出的地质特征及矿床成因,认为地层岩性及火山喷发、断裂构造、岩浆岩作用三位一体控制着尹家坪金矿金的富集与成矿,特别是F2断裂破碎带是成矿的关键构造条件;金成矿物质主要来自海西中-晚期闪长岩,源自地壳深部,热液来源有岩浆热液、大气降水。尹家坪金矿为浅层中低温热液活动形成的构造蚀变岩型金矿床。

Geological characteristics and genesis of Yinjiaping gold deposit in the west Qinling mountain

Yinjiaping gold deposit is located at the northern margin of the Indosinian southern Qinling folded belt in western Qinling folded system. Orebodies occur at the contact of the Hercynian-Indosinian diorite intrusive body and the wall-rock. The three factor combination of volcanic eruptioin, faulting and magmatism controls enrichment of gold and the ore formation. Especially, cataclastic zone of F₂ is the key factor. The ore materials come mainly from Middle-Late Hercynian diorite at deep crust and hydrothermal fluid from magmatic and meteoroid water. The deposit is a epi-mesothermal alterted cataclastic rock type gold deposit.