秦岭若干重要类型金矿床成矿地质条件研究新进展

NEW DEVELOPMENT OF THE RESEARCH ON METALLOGENY OF SOME IMPORTANT TYPE OF GOLD DEPOSITS IN QINLING REGION

通过秦岭金矿区域成矿地质条件研究取得的进展 :八卦庙矿区发育有条带状的热水沉积岩 ,金矿床类型属于热水沉积韧性剪切带改造型 ,矿化类型为细脉浸染型 ;马鞍桥金矿的成矿大地构造环境属于华北板块南缘 ,含矿岩系为早古生代的深水斜坡浊积岩相 ,矿区的“浅色岩相”系变质成因 ;煎茶岭金矿属构造蚀变岩型金矿 ,而非超基性岩浆热液型金矿。

There have been some new views about the metallogenic geological conditions of three important types of gold deposits Baguamiao,Maanqiao and Jianchaling in Qinling region.The banded sediment stone are found in Baguamiao gold deposit.The deposit type of Baguamiao gold deposit belongs to hot water sediment transformation type gold deposit.Its mineralization type is fine vein and fine grained disseminated gold deposit.The geotectonic unit of Maanqiao gold deposit belongs to south margin of North China plate.The age of its gold bearing formation is early Paleozoic,in which there are turbidite facies in the deep water slope,The“bleached lithofacies”is resulted by metamorpism.Its basement stratum Bikou group should be divided into four stratum units,Jianchaling gold deposit is structure altered rock type deposit,not similar to the mantle ultrabasic magma hydrothermal gold deposit.The study above pointed out the new direction and new type of gold deposits for prognosticate in Qinling region.