江西省大余县左拔钨矿隐伏花岗岩地质特征及其与成矿关系探讨

Geological Characteristics of Concealed Granite and Its Relationship with Mineralization in Zuoba Tungsten Mine,Dayu County,Jiangxi Province

南岭成矿带中段是赣南重要的钨矿聚集区,每一个钨矿床的深部都有一个隐伏花岗岩岩体,而矿床的矿脉集中区深部往往对应着隐伏花岗岩的凸起部位。本研究拟通过对左拔矿区深部的隐伏花岗岩的产出地质特征进行分析,结合已有的找矿成果,探讨深部隐伏花岗岩与成矿的关系。研究结果表明,云英岩是石英脉与花岗岩的连接纽带,属于成矿过程中的过渡产物,是岩浆侵入的分异前锋。这一认识为寻找“地下室”矿体提供了明确的找矿方向与思路,也为老矿山深部找矿指出了方向。

The middle segment of the Nanling metallogenic belt is an important tungsten ore concentration area in southern Jiangxi.Each tungsten deposit's deep part has a concealed granite body,and the deep part of the vein concentration area of the deposit often corresponds to the convex part of the concealed granite.Based on the analysis of the geological characteristics of the concealed granite at depth in the Zuoba mining area and existing prospecting results,this paper discusses the relationship between deep concealed granite and mineralization.The results indicate that greisen is the connecting link between quartz vein and granite,belonging to the transitional product in the process of mineralization and is the differential front of magmatic intrusion.This understanding provides a clear prospecting direction and strategy for finding"basement"ore bodies and also points out the direction for deep prospecting in old mines.