甘肃西部化石沟铜矿地质特征及其找矿标志

化石沟铜矿是近年来甘肃西部发现并评价的最具影响的铜矿床。矿体主要赋存于海西晚期的英云闪长岩和英云闪长斑岩中,近南北向的弧形断裂控制含矿岩体和地层的展布。硅化、绢英岩化、黑云母化蚀变与成矿呈正相关关系,且具斑岩型矿床的蚀变分带特征。表部发育的次生氧化带、硅化、绢英岩化、黑云母化及弧形构造带与含矿岩体的组合是矿床的直接找矿标志,激电异常及化探异常、重砂异常是矿床的间接找矿标志。目前各类找矿标志显示,化石沟矿区及外围具较大的找矿潜力,通过勘查找矿,化石沟铜矿有望成为大型乃至超大型矿床。

GEOLOGICAL FEATURES OF HUASHIGOU COPPER DEPOSIT IN WESTERN GANSU PROVINCE

Recent years, Huashigou copper deposit in western Gansu Province is the most evaluate copper deposits. It＇s orebodies mainly occur in the late Hercynian＇s Tonalitic rocks and Tonalite porphyry. Ore-bearing rock and the spread of the srtatigraphic is controlled by the arc faults nearly south-north. The mineralization were positively correlated with silicifieation, phyllic alteration, biotite alteration and have the characteristic of porphyry type deposits＇s alteration zonation The direct prospecting criteria are secondary oxidation zone, silicification, phyllic alteration Arc tectonic belt at surface layer as well as the combination of the ore- Indirect prospecting criteria of the deposit are IP anomaly and Geochemical anomalies, Currently, various types of prospecting indicators show copper mining at HuaShiGou and it＇s larger prospecting potential, Through exploration prospecting, copper deposit at HuaShiGou large and even very large deposits. bearing placer rock, The abnormal external have the is expected to be