蚌埠—淮北地区电性结构及地质意义OACSTPCD

This study conducted magnetotelluric profiling in the Bengbu-Huaibei area of Anhui Province.Combined with gravity and magnetic anomalies,it obtained the deep electrical structure,the distribution of primary strata,and the properties of faults in the area,particularly the morphology of the Xuzhou-Suzhouarcuate nappe structure and the development of deep coal-measure strata.The results indicate that:(1)The Upper Paleozoic strataare primarily distributed under the high-resistivity nappe on the surface of the Xuzhou-Suzhouarcuate nappe structure.Theymanifest low-resistivity and low-densityphysical properties and high continuity,suggesting high ex-ploration potential for coal beneath the nappe structure;(2)On the profile,early-stage faulting was dominated by reverse faults,resul-ting in local Lower Paleozoic and Proterozoicstrata overlying the Upper Paleozoic strata.In the later stage,normal faults predominated,controlling the Cenozoic deposition;(3)The Xuzhou-Suzhouarcuate nappe structure exhibits a'high-low'double-layer electrical struc-ture at burial depths shallower than 4 km,withthe dominant thrust fault plane composed of F5 and F6 faults.The leading edge of the high-resistivity nappe on the surface extends northwestward to Xiaoxian County and southward to northern Guzhen County,experiencing significant denudation in the Zhahe area.The above results provide critical geophysical information for the basic geological research and mineral exploration in the study area.