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.