武夷山北段及相邻区深部电性构造与成矿分析：基于三维大地电磁探测结果

Deep electrical structures and metallogenic analysis in the north section of Wuyishan Mountains and its adjacent areas: Based on three-dimensional magnetotelluric sounding results

华南地区经历了多期构造-岩浆-成矿作用,矿产资源丰富,存在多个成矿聚集区,是国家经济发展的重要矿产基地。本文使用华南地区采集的区域大地电磁阵列观测数据,利用WSINV3DMT三维反演程序科学构建了武夷山北段及相邻区三维电性结构模型。结果显示,沿闽西北断裂、政和-大浦断裂等断裂带下方,深部表现为明显的低阻异常带,可能是古微陆块拼合线或深大断裂的反映,对上覆浅层断裂构造具有明显的控制作用。武夷地区已探明的主要内生金属矿床中,绝大部分矿床点位于这些低阻异常带、深部软流体边缘位置上方,同时又主要分布于ΔΤ化极磁异常梯度带之上,具有明显的分布规律性,结合上述规律和特征,可在武夷地区初步圈定找矿有利方向。

South China has experienced the evolution of multiple stages of tectonic-magma-mineralization. It is rich in mineral resources and has multiple mineralization concentration areas, which constitute an important base for national economic development. In this paper, the three-dimensional electrical structure model of the northern part of Wuyi Mountain and adjacent areas is constructed by using the regional magnetotelluric array observation data acquired in south China and the three-dimensional inversion program of WSINV3 DMT. The electrical characteristics of the model show that the deep electrical characteristics along the lower part of the fault zone exhibit obvious low resistivity anomalous zones. The low resistivity anomalous zones may be the response of deep and large faults or the assembling boundary of paleo-micro-continental blocks, which have obviously controlled the shallow fault structure. It is found that most of the major endogenous metal deposits in Wuyi area are located above the low resistivity anomaly zone and the edge of deep soft fluids. They have obvious distribution regularity. At the same time, they are mainly distributed in the gradient zone of ΔΤ polarized magnetic anomaly. Combined with the above distribution rules and characteristics, the favorable areas for prospecting can be preliminarily delineated in Wuyi area.