内蒙古大青山地区金矿床类型、控矿规律及找矿方向

内蒙古呼和浩特地区主要有三种类型金矿床:构造蚀变岩型、中基性岩浆热液型和绿岩型.它们分别受控于不同地质条件:构造蚀变岩型主要受控于韧性剪切带或断裂带构造,中基性岩浆热液型主要受控于中基性幔源的埃达克岩-赞岐状岩-富Nb辉长岩,绿岩型金矿主要受二道洼群地层控制.然而,这些矿床成因复杂,往往受控于多个成矿因素,当上述两个以上成矿条件同时存在时,成矿的可能性就会增大.如绿岩型金矿主要受控于二道洼地层,但矿体主要受韧性剪切带或断裂构造的叠加部位控制.因此,在本区寻找以上三种类型的金矿床,特别注意在二道洼群地层、中基性幔源埃达克岩-赞岐状岩-富Nb辉长岩附近和韧性剪切带或断裂构造叠加部位.另外,由于与中基性岩有关的矿床还未引起足够重视,注意寻找该类型矿床就显得很有必要.

Types,Metallotects and Exploration Direction of the Gold Deposit in Daqingshan Mountain, Inner Mongolia

Base on the geological study in Hohhot area,Daqingshan Mountain in the middle of Inner Mongolia,the gold deposits could be classified as three types: tectonic-altered rock type,altered rock type with thermal fluid associated with middle-basic magma,and greenstone type.The first type is mainly located in the ductile shear zones or fault belts.The second type appears in the middle-basic magmas rocks like adakites,sanukitoids Nb-enriched gabbro. And the third type mainly occurs by the gold-bearing formation Erdaowa Group which formed by volcano-meta-sedimentary rocks.However,they are not only controlled by a single factor,but also multi-factors.For example,the greenstone gold deposit mostly related to the gold-bearing formations,but the ore body formed when it overprinted on the ductile shear zone or fault belts.So,in this area,we can explored the three types of the gold deposits in the ductile shear zones(fault belts),and / or magmas related to adkites,sanukitiods,Nb-enriched gabbro and / or the Erdaowa Group,specially when they overprinted on each other.As the gold deposit related to the magma like adakites,sanukitoids and Nb-enriched gabbro is not paid enough attention,it is suggested that this type of gold deposit should be focused on in the area during the exploration.