西秦岭尹家坪金矿地质特征及矿床成因

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

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。

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