甘肃省西和县饮马河金矿绿色勘查

Green exploration of Yinmahe gold deposit,Xihe County,Gansu Province

饮马河金矿产于秦岭造山带三叠纪浅变质岩系中。金矿体主要赋存在石炭系和三叠系接触带附近的硅化角砾岩中。另外,背斜的转折端亦为褶皱的虚脱部位,是有利的成矿空间,因此大桥矿区主矿体主要赋存于复式背斜的转折端附近,且褶皱核部的硅质角砾岩比北翼其它硅质岩含矿性好。综合上述认为矿区赋矿层位主要以充填、交代的方式形成了强硅化的硅化角砾岩、复成分角砾岩和硅化岩,硅化岩与角砾岩呈过渡关系。角砾岩与硅化岩在相邻工程、剖面间可大致对应连接。金矿化主要赋存在硅化角砾岩及其周围的硅化岩中。大桥-饮马河金矿床成因类型应属中低温热液矿床。该矿床的发现对西秦岭地区金矿找矿工作具有十分重要的意义。

Yinmahe gold deposit occurs in the Triassic epimetamorphic rock series of Qinling orogenic belt.The gold deposits are mainly hosted in silicified breccia near the contact zone between Carboniferous and Triassic.In addition,the turning end of the anticline is also the collapse part of the fold,which is a favorable metallogenic space.Therefore,the main ore body in Daqiao mining area is mainly located near the turning end of the compound anticline,and the siliceous breccia in the core of the fold has better ore bearing capacity than other siliceous rocks in the north wing.Based on the above,it is considered that the ore bearing strata in the mining area mainly formed strong silicified breccia,complex breccia and silicified rock in the way of filling and metasomatism,and the silicified rock and breccia showed a transitional relationship.Breccia and silicified rock can be roughly connected between adjacent projects and sections.Gold mineralization mainly occurs in silicified breccia and silicified rocks around it.The genetic type of Daqiao Yinmahe gold deposit should belong to the middle low temperature hydrothermal deposit.The discovery of the deposit is of great significance to the gold prospecting in the West Qinling area.