Fault and lithology interpretation for the northern coastal zone of Taizhou based on aeromagnetic data

The northern coastal zone of Taizhou spans three tectonic units: the North China Block, Lower Yangtze Block, and Cathaysian Block. The regional geological structure is complex, magmatic activity is strong, and faults are developed. Based on the latest aeromagnetic data, along with airborne gravity, regional geology, and measured rock susceptibility data, the aeromagnetic anomaly characteristics and distribution regularity of magmatic rocks and faults in the study area are classified and studied. Hundreds of intrusive and volcanic rocks are delineated, and magmatic activity is mainly concentrated in the Meso-Cenozoic Era, which is dominated by the Yanshanian Period and controlled by deep-large faults; these deep-large faults are mainly distributed in NE, NNE, and NW directions. There are SN, EW, and arc faults as well. The former has a great influence on the regional structure and tectonic evolution. Based on the epicenter distribution of natural earthquakes, deep-large fault activity is preliminarily discussed. The results presented in this study can provide a reference for meeting national strategic needs and conducting a comprehensive geological survey of the coastal zone, resolving major geological problems, realizing the goal of land-sea integration, and assisting in the planning of northern coastal economic zone, urban agglomeration planning and site selection, major engineering constructions, and so on.