Features and geological significance of gravity-magnetic-electric from the middle part of Lujiang—Zongyang basin in Anhui Province

Lujiang-Zongyang basin is an importatant ore concentration area in middle-lower reaches of Yang-tze, and the characteristics of volcanic basement were unclear, which had restricted the mineral exploration. Based on the reprocessing and understanding of 1∶50 000 high precision gravity-magnetic data and magnetotelluric measurement data in the research area, the researchers in this paper discussed the characteristics and geolo-gical significance of the geophysical field. The results show that the Lujiang-Zongyang volcanic basin is located in the saddle of the Paleozoic fold belt with NE trending, and the thickness of volcanic strata is related to the distribution of local gravity anomaly values. The hidden intrusive rock is under the volcanic strata, which is thick-bedded, with depth of bottom surface of 3~4 km. The Huangtun-Zongyang fault and the Luohe fault are the main tunnel for hypomagma. The Triassic-Carboniferous strata was intruded, and the Silurian-Devonian strata was developed under the hidden intrusive rock. This research provides important clues for the fundamental geology research and ore prospecting prediction in Lujiang-Zongyang volcanic basin.