China Geological Survey: 1: 50 000 Geological Map Database of the Liangcheng County Map-sheet (K49E021018), Inner Mongolia

The Liangcheng County map-sheet (K49E021018) in Inner Mongolia Autonomous Region is situated in the central-southern part of Inner Mongolia. It occupies a tectonic position on the eastern segment of the Khondalite Belt along the northern margin of the North China Craton, belonging to the typical early Precambrian high-grade metamorphic terrain of the North China Craton. The 1: 50 000 Geological Map Database of Liangcheng County was compiled in accordance with the China Geological Survey’s geological survey technical standards “Technical Requirement for Regional Geological Survey (1: 50 000)” (DD 2019-01) and other industry-unified standards and requirements. Modern metamorphic terrain mapping techniques and digital mapping systems were employed for its completion. Through the 1:50,000 regional geological survey, a substantial amount of basic geological data was obtained, revealing the rock types of the anatectic granite in the Liangcheng area of Inner Mongolia and their spatial relationship with the Khondalite Series. The survey also explored the genetic mechanisms of the anatectic granite and established a late Palaeoproterozoic tectono-magmatic-metamorphic event sequence. Additionally, innovations in regional geological survey techniques for anatectic granite areas were achieved, effectively addressing the previous issues of confusion in the delineation of mapping units and insufficient understanding of the genesis of anatectic granites. It was indicated that the formation of different types of anatectic granite is primarily controlled by source rocks and is related to the anatexis periods (temperature and pressure conditions under which anatexis occurred and the melting reaction), as well as the cumulate differentiation during melt migration processes. The raw data database and a geological map spatial database were constructed. The geological map spatial database dataset is composed of basic feature class, complex class, independent feature class, and object class, with data formats in MapGIS format.