夹皮沟金矿田北沟金矿床深部地质特征与控矿因素分析

Analysis of Geological Features and Ore Control Factors on Beigou Gold Deposits in Jiapigou Gold Field

北沟金矿床产于三道沟组地层中,具有明显的层控特征;北沟金矿区中各种张裂隙、层间裂隙、糜棱岩化带、接触带构造控制了矿体的产出位置和产状;控矿侵入岩具有多期活化的特点,24-25亿年的区域变质作用和16-18亿年钾质花岗岩浆的重熔作用使矿源层中的金随着变质热液活化、转移,华力西晚期的岩浆活动,使金进一步富集成矿。通过对北沟金矿地质特征的总结,结合区域上和本矿区的控矿因素研究,北沟矿区深部仍具有较大的找矿潜力。

Beigou Gold deposit occurs in the three trench formation,with obvious stratabound characteristics. The orebody is controlled by various tensile crack,crack in layer,mylonitized contact zone tectonic belt of Beigou gold mine on the position and occurrence. The ore controlling intrusive rocks have the characteristics of multi stage activated regional metamorphism. With 2. 4 ~ 2. 5 billion years of regional metamorphism and 1. 6 ~ 1. 8 billion years of anatexis of potassic granite magma,that ore source layer of gold was activated and transferred,and late Hercynian magmatic activity formed the gold enrichment mineralization. By analyzing the geological characteristics,combined with regional and ore controlling factors in this area of research,it is concluded that deep North Ditch mine still has great potential for the prospecting.