1∶50 000 Geologic Map Database of Yueyashan Map Sheet, Inner Mongolia

The 1∶50 000 geologic map database of Yueyashan map sheet (K47E015010), Inner Mongolia (also referred to as the Database) was comprehensively mapped and prepared according to the technical standards Technical Requirements for Regional Geological Survey (Scale: 1∶50 000) and Spatial Database Establishment Code of Digital Geologic Maps. In this case, the latest mapping ideas of orogenic belts were followed, a digital geological survey system (DGSS) was adopted, and the 1∶10 000 large-scale mapping of ophiolitic melange belts were combined. Furthermore, the structural and lithologic boundaries in Yueyashan map sheet were continually verified by making full use of the results of 1:200 000-scale regional geological surveys and 1∶50 000-scale mineral surveys as well as the remote sensing images of multiple types such as Spot, ETM, and Aster. As a result, the geologic maps in the Database were finally prepared according to the structural framework of the map sheet, and serve as part of the first-batch exploratory results mapped under the guidance of orogeny theory in Beishan area. In this Dataset, the material composition and structural association characteristics of the Baiyunshan ophiolites were plotted in the maps in detail, the sedimentary formations of the middle Neoproterozoic, Sinian, Cambrian, Ordovician, and Devonian were reclassified, the intrusions in the map sheet were divided into four sequences (i.e., the middle Silurian sequence, early Devonian sequence, late Devonian sequence, and early Permian sequence), and a comparatively complete tectonic evolution sequence was also established. This Database consists of the data and files of Yueyashan map sheet, including the data of three informal mapping units, eight formal stratigraphic units, four stages of magmatic events, and four stages of tectonic deformation, with a size of 26.7 MB. In addition, three hundred fifty-eight samples for thin slice petrographic observation, eighty-four samples for whole-rock geochemistry analysis and fourteen samples for zircon U–Pb dating were collected, and two mineralized sites were discovered in this work, all of which were also integrated into the database. These data reflect the demonstrative results of a 1∶50 000-scale geological survey of an orogenic belt, and can be used as a reference for subsequent mapping of orogenic belts. In addition, tectonic and magmatic evolutionary history of the subduction process was highlighted in the data, which is of scientific research value for the early Paleozoic evolution of Beishan orogenic belt.