宁芜盆地北段深部地质结构综合地球物理方法解析

宁芜盆地位于长江中下游成矿带东部,但对其北段深部地质结构的研究尚显薄弱。综合利用音频大地电磁及重力测量方法，对研究区深部构造、地层展布、隐伏岩体分布形态及埋深、火山岩基底埋深情况进行综合解译。结果显示，宁芜盆地内北段电阻率自西向东呈西低东高、自南向北呈南高北低的特征；岩浆活动强烈，深部具有较好的成矿潜力，白垩系火山岩地层底界最大埋深可能在-1 400 m左右，部分岩体侵入火山岩基底附近或三叠系地层中，相关层位可作为找矿靶区，应进行进一步的找矿勘探工作。

Comprehensive geophysical interpretation of the deep geological structure in northern Nanjing-Wuhu Basin

The Nanjing-Wuhu Basin is located in the east of the middle-lower Yangtze metallogenic belt. The study of its deep geological structure in the north is still inadequate. This work utilized audio-magnetotelluric and gravity measurement methods to interpret the deep structure, stratigraphic distribution, the shape and burial depth of concealed intrusions and the burial depth of volcanic basement in the study area. The results show that the resistivity in the northern section of this basin is low in the west and high in the east, and is high in the south and low in the north. The magmatic activity was very strong in the north, indicative of a good prospecting potential in the deep. The maximum bottom depth of the Cretaceous volcanic rocks may be at about -1,400 m, and some rock masses intruded the vicinity of the volcanic basement or the Triassic strata. These layers can be regarded as exploration targets for further exploration.