1∶50 000 Regional Geological Map Database of the Qinghegou Map-sheet, Inner Mongolia

The 1∶50 000 regional geological map (K47E010009) of the Qinghegou Map-Sheet in Inner Mongolia, as an excellent national regional geological survey map (2018), was compiled by making full use of previous regional geological survey results. Through remote sensing, geophysical and geochemical exploration, geological survey, surveyed geological cross section, large-scale mapping and other means, an in-depth investigation was conducted on the ophiolitic mélange belt, sedimentary strata, igneous rock and tectonic deformation characteristics in the region. The spatial distribution, material composition and metamorphic deformation characteristics of the ophiolitic mélange belt were identified and classified as a Carboniferous Supra-Subduction Zone (SSZ) ophiolite. A detailed analysis of igneous rocks in the area has led to the classification of three magmatic events, namely, in the Late Silurian-Devonian, Carboniferous-Early Permian and Middle Permian, and the establishment of a tectonic-magmatic evolution sequence. The strata in the area have a comprehensive stratigraphic column established and are divided into two stratigraphic subregions separated by the Baiheshan ophiolitic mélange belt with distinct differences in rock combination and sedimentary environment. The map database contains geochemical analysis data of 67 samples and zircon U–Pb dating data of 17 samples. It represents the comprehensive results of the regional geological survey of the Qinghegou Map-Sheet, which is composed of the main maps, along with the map appearance and map border, covering the attributes of sedimentary and igneous rocks, ophiolitic mélanges and other geobodies in the area. It fully reflects the structure of the orogenic belt and the geological evolution process in the area, providing basic data support for geological prospecting and in-depth investigations on orogenic belts in the Beishan area.