摘要
庐枞矿集区是长江中下游成矿带中主要矿集区之一,一直以来都是热点研究区域。了解该地区的地质构造,区内侵入岩体以及控矿地层的位置和展布规律,对基础地质问题的解决和深部找矿靶区的预测都是十分必要的。本研究采用综合地球物理方法建立了庐枞矿集区面积约6574 km2,深度范围从地表至地下5 km 的三维地质模型,给出了深部地质体的几何形态、深度范围和物性分布特征。在三维可视化平台上对该模型进行了地质解释,全面分析了基底、岩体、矿体、地层之间的空间分布及对应关系。在证实许多原有认知的同时,也得到了新的认识,如不同的褶皱和侵入特征,深部岩体地质形态,研究区地层展布规律等,这些对于深入认识深部成矿、控矿规律以及寻找深部隐伏矿体意义重大。结合地质模型和成矿理论预测了一些深部找矿靶区。同时,研究结果表明在复杂地区使用地质条件约束下的地球物理数据反演方法建立三维模型来进行深部成矿预测是深部找矿技术发展的重要方向。
As always,Luzong ore district,one of most important districts in the middle and lower Yangtze River,is immediate areas of research focus.Understanding the 3D structure,delineating the locations and variations of the intrusions and ore-controlling strata in the study area are essential for selecting deep mineral targets.A pilot 3D geologic model,coving an area of about 6574 km2(81.08 km×81.08 km)and extends to a depth of 5 km,has been constructed by geophysical inversion based on priori information constrained to define the geometry,depth,and physical properties of geological bodies at depths.The 3D visualization of the results assists in understanding the spatial relations between various intrusive units and the ore-bearing strata.The model has confirmed most previous knowledge,but also revealed new features of different folds and intrusions、geologic formations of deep rock masses and the spatial distribution of strata,those are important for planning future exploration at large depths.A number of deep targets have also been predicted by combining the conceptual mineralization model in the district with the 3D geological model.Our study demonstrates the potential of using gravity data with geologic constraints to build 3D models in structurally complex areas for the purpose of mineral exploration at depth and under cover.