大兴安岭北部福草山侵入岩体特征及构造环境

Disscussion on characteristics of Fucaoshan intrusive body in Northern Daxing'anling mountains and the tectonic environment

福草山岩体为中酸性侵入岩,呈岩基-岩株状出露,为海西期和燕山期岩石类型亚碱性系列和钙碱性系列花岗闪长岩、闪长玢岩、二长花岗岩,为富硅、富钠、铝过饱和、轻稀土富集型,具壳幔混源型与壳源型花岗岩特征,是同源岩浆形成的产物,其形成与蒙古-鄂霍茨克造山带陆陆碰撞有关,为金及多金属富集沉淀提供了良好的地质环境,先后发现了椿叶山、福草山、北宽河、真理山等金矿(化)点,今后应加强构造破碎蚀变岩型金矿床的勘查工作。

Fuchaoshan intrusive body is composed of Yanahanian and Hercynian sub-alkaline series and calcium alkaline series granodiorites,dioritic porphyrite,and monzonitic granite and is characterized by enrichment of Si,Na,LREE and Al over-saturation,mixed mantale-crust and crustal source granite and outcropped in batholith or stock.The intermediate-acid rocks are of consanguinitty.Tectonically,formation of the intrusive body is related to Mongolia-EHuo Cike orogenic belt resulted from continental collision where is favorable envionment for deposition and enrichment of Au and polymetals and Chunyeshan,Fuchaoshan,Beikuanhe,Zhenlishan gold occurrences have been discovered.In future gold exploration should be focused on altered cataclastic rock type gold deposit.