藏东江达县丁钦弄银铜多金属矿床深部找矿预测

Predication of Ore Prospecting in Deep Part of Dingqinnong AgCu Polymetallic Deposit in Jiangda County in Eastern Tibet

摘要:

西藏丁钦弄银铜多金属矿床是近年来在藏东地区发现的具大型远景的接触交代（矽卡岩）型银铜多金属矿床，该矿床位于羌塘三江成矿区之江达德钦成矿带北段。成矿作用包括陆内裂谷期的矽卡岩化成矿作用及陆内造山期构造—岩浆—热液对先成矿体的叠加改造及独立成矿作用。基于对矽卡岩矿床分带模式结合矿区实际情况的分析辅以地球物理证据，预测Ⅰ2 号矿体及Ⅱ号矿体的深部找矿前景较好。两矿体含矿岩石均为锰质矽卡岩，处于侵入体与围岩的外接触带，且视电阻率、视极化率异常均显示深部存在隐伏矿体。

Abstract:

Dingqinnong AgCu polymetallic deposit is a contact metasomatic skarn type polymetallic deposit with large scale. It was found in recent years. It located in Jiangda tectonic belt in southern Sanjiang metallogenic belt. Mineralization includes intracontinental rift stage contact metasomatism silicon card lithification mineralization and intracontinental orogenic period tectonomagmatic thermal fluid to antecedent orebody superposition and transformation and independent metallogenesis. Based on analysis of skarn deposit zone model, combining with actual situation of geophysical evidences, it is predicted Ⅰ 2 ore body and Ⅱ ore body have good prospecting future in deep part. Orebearing rocks are manganese skarn, and located in external contact zone of the intrusive rocks and surrounding rocks. Apparent resistivity and apparent polarizability anomaly shows there exists hidden ore bodies in deep part.