A 3D Investigation of Geological Structure and Its Relationship to Mineralization in the Nanling-Xuancheng Ore District, Middle-Lower Yangtze River Metallogenic Belt, China

• Published in: Journal of earth science (Wuhan, China) Vol. 33; no. 3; pp. 664 - 680
• Main Authors: Lu, Sanming, Lan, Xueyi, Zhao, Lili, Zhang, Zanzan, Yang, Xiaoyong, Zhao, Zhuang, Guo, Dong, Xu, Xiaochun, Wang, Yongsheng, Li, Jianshe, Qi, Huasheng
• Format: Journal Article
• Language: English
• Published: Wuhan China University of Geosciences 01-06-2022; Springer Nature B.V; Public Geological Survey Management Center of Anhui Province,Hefei 230091,China%Geological Exploration Technology Institute of Anhui Province,Hefei 230031,China%CAS Center for Excellence in Comparative Planetology,University of Science and Technology of China,Hefei 230026,China%School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China
• Subjects: Anticlines; Belts; Biogeosciences; Copper; Diagenesis; Diorite; Drilling; Earth and Environmental Science; Earth Sciences; Fault lines; Fluvial deposits; Geochemistry; Geological faults; Geological structures; Geology; Geotechnical Engineering & Applied Earth Sciences; Gold; Gravity; Hydrothermal deposits; Igneous rocks; Mesozoic; Metallogenesis; Mineral deposits; Mineralization; Pacific Plate Subduction and the Yanshanian Movement in Eastern China; Plutons; Porphyry copper; Ridges; Rivers; Seismic surveys; Yangtze River; metallogenic mechanism; ore deposits; 3D structure; Nanling-Xuancheng ore region; geophysical exploration; Middle-Lower Yangtze River metallogenic belt
• ISSN: 1674-487X; 1867-111X
• DOI: 10.1007/s12583-021-1577-x

The Nanling-Xuancheng ore region of Anhui Province is located in the Middle-Lower Yangtze River metallogenic belt. Insufficient exploration and research have been carried out in this newly defined ore district, although the Chating large porphyry Cu-Au deposit and a few middle-sized skarn-type Cu polymetallic deposits have been discovered. In this study, we carried out high-resolution seismic reflection, magnetotelluric, gravity, and magnetic investigations, and constructed the 3D geological structure of the uppermost crust in a depth range of 0–5 km using a comprehensive inversion of the new data constrained by previous deep-drilling data. We hence proposed some new insights to understand the mineralization processes of this district. A system of alternating ridges and valleys is suggested as the major structure pattern, composed of “two-layer structure” of the basins and “three-layer structure” of anticlines. Moreover, a conjugated fault system and its distribution features are revealed in our models, including the Jiangnan fault, Zhouwang fault, and Kunshan thrust nappe. The Jiangnan and Kunshan faults are suggested to have controlled the diagenesis and metallogenesis. Two deep concealed plutons located in Chating and Magushan are found, forming the Mesozoic diorite-felsic intrusions. These intrusions are believed to be the causes of hydrothermal deposits such as the Chating deposit and the Magushan deposit.