1∶50 000 Geological Map Database of the Dongliumafang Map-sheet at the Junction of Shanxi, Hebei and Inner Mongolia

The Dongliumafang Map-sheet (K50E023002) is located in the Hengshan-Sanggan high-pressure  granulite  belt  at  the  junction  of  Shanxi,  Hebei  and  Inner  Mongolia.  The  1∶ 50  000  Geological  Map  Spatial  Database  of  Dongliumafang  Map-sheet  was  compiled  in accordance with the Technical Requirement for Regional Geological Survey (1∶50 000) (DD 2019−01) newly issued by China Geological Survey and other relevant uniform standards and requirements,  by  using  modern  mapping  technology  for  metamorphic  rock  area  and  digital mapping acquisition system. The map-sheet gave a detailed definition of the strata, magmatic rocks, metamorphism and tectonic structure in the Neoarchean-Cenozoic era in the area: four tectonic-lithostratigraphic  units  of  the  Neoarchean  Sanggan  Group  and  the  Paleoproterozoic Jining Group, and 13 Mesoproterozoic-Cenozoic stratigraphic units have been established; the evolutionary  series  of  Neoarchean-Paleoproterozoic  and  Mesoproterozoic-Mesozoic (metamorphic) intrusive rocks have been established; the structural deformation style of three periods of Early Precambrian, and the fracture structure in the Mesozoic-Cenozoic Indosinian, Yanshanian  and  Himalayan  periods  have  been  identified;  two  types  of  high-pressure  basic granulites  with  different  protolith  properties  have  been  identified,  with  metamorphic  periods divided.  The  map-sheet  uses  special  line  segments  and  patterns  to  express  the  plastic rheological characteristics and structural deformation style of deep crustal rocks in the ancient orogenic belt, and has reconstructed the evolution process of Paleoproterozoic orogenic tectonics. The database adopts a MapGIS format and comprises 1∶50 000 geological map library, map appearance and corner maps, and contains nine data pieces of zircon U-Pb age,with a data volume of 53.8 MB. The 1∶50 000 Geological Map of Dongliumafang Map-sheet has innovated the mapping techniques for high-grade metamorphic areas as well as map expression methods, setting an example for mapping work on high-grade metamorphic rock areas.