赣南新林屋—均村地区低磁性隐伏岩体的识别:来自重磁场的证据

Identification of low magnetic concealed granitic complex in the Xinlinwu-Juncun area, southern Jiangxi Province: Evidence from gravity and magnetic fields

通过在赣南新林屋—均村地区开展1∶5万高精度磁法测量工作,结合1∶20万重力测量数据,以岩石物性为基础,分析该区重磁异常并圈定隐伏花岗岩体。新林屋—均村地区低磁性、低密度的花岗岩侵入至具有磁性的前寒武纪变质岩中,形成磁低重低的异常特征;推断新林屋—均村地区存在1个呈NW向展布的隐伏花岗岩体,该隐伏花岗岩体浅部受SN—NE向弧状断裂控制,深部受NW向断裂控制,浅部分布范围较深部更广。这些信息为该区进一步找矿提供了基础地球物理资料,也为同类地区寻找隐伏花岗岩体提供参考。

A1 ∶50,000 high-precision magnetic survey was carried out to investigate gravity and magnetic anomalies in the Xinlinwu-Juncun area, South Jiangxi Province and determine low magnetic concealed granitic complex in this area, based on the1 ∶200,000 gravity anomaly characteristics and petrophysical properties.The low-magnetic and low-density granite invaded into Precambrian magnetic metamorphic rocks, which resulted in the anomalous features of low magnetic and low gravity in the Xinlinwu-Juncun area.It can be inferred that there exists an NW-trending hidden granite complex in this area, the shallow part of which is controlled by the SN to NE-trending arc-shaped fault, and the deep part is controlled by the NW-trending fault.The shallow part distributes much wider than the deep part.This study not only basic geophysical information for further predicting mine exploration in this area but also reference for seeking hidden granite complexes in similar areas.