Database of 1∶50 000 Mineral Geological Map of Changtuxilesitai Map-sheet, Inner Mongolia

In this paper, the database of 1∶50 000 mineral geological map of ChangtuxilesitaiMap-sheet (L50E015021), Inner Mongolia (also referred to as the Database) was establishedon the basis of digital geological mapping system, achieving the digitalization of the wholeprocess of early data preparation → field geological mapping → indoor comprehensive datacollation → the presentation of final results. Meanwhile, various relevant data were effectivelydescribed, stored, organized and utilized in an integrated way. The mapping method of“volcanic structure–lithology and lithofacies–volcanic strata” was adopted during theestablishment of the Database. As a result, the volcanic strata were determined again, and thevolcanic lithofacies as well as eruption cycles and their association types were classified indetail. Furthermore, the relationship of volcanics, volcanic structures and volcanic activitieswith mineralization were ascertained, and the geological conditions and metallogenic rule ofmetal minerals in Mesozoic volcanic areas were summarized. The Database contains eightstratigraphic units, four phases of volcanic eruption cycles, eight mineralization prospectingareas and six prospecting target areas. In addition, it also contains analytical data on 1 170pieces of rock samples and 261 pieces of samples for geochemistry, 108 pieces of samples forpetrochemistry, 222 pieces of thin slice samples for petrography, 35 pieces of S and Pbisotopes, ten pieces of H and O isotopes, as well as four zircon U–Pb ages. The newlydiscovered Changtuxili Ag-Pb-Zn-Mn deposits in the map-sheet area have a roughly identifiedresource of 1 028.35 tonnes of 3341 Ag, 112 500 tonnes of Pb, 93 600 tonnes of Zn and 552 400tonnes of Mn, belonging to a large-scale silver polymetallic deposit. The Database is detailedand accurate in contents and boasts high utility, providing important basic data for furthersurvey and assessment of mineral resources, as well as the exploration and development ofmetal minerals in the area of Mesozoic volcanic rocks in the middle–southern section of the DaHinggan Mountains.