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.