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

According to the ‘Technical Requirement for Regional Geological Survey (1∶ 50 000)’ (DD 2019–01) and other uniform standards and requirements, and making full use of the data for 1∶200 000 regional geological and 1∶50 000 mineral survey, the 1∶50 000 Geological Map of Beiliutumiao Map-sheet (K49E011021), Inner Mongolia was compiled by adopting the Digital Geological Survey System (DGSS) in combination with Spot, ETM, Aster and other remote sensing images to continuously verify and modify tectonic and lithologic boundaries. As an achievement with important value of reference in the WenduermiaoBainaimiao area of Inner Mongolia, the map provides detailed information on the rock composition and tectonic association of the Bainaimiao island-arc belt. We re-divide sedimentary formation into different types, i.e., Silurian, Permian, Cretaceous, and classify intrusive rocks in the region into four phases, establishing a relatively complete tectonic evolutionary series. The map database includes three informal mapping units, 10 formal stratigraphic units, four periods of magmatic events and two tectonic deformations, as well as the whole rock analysis of 176 samples, and zircon U–Pb ages of 10 samples, with a data size of 28.9 MB. The map details the tectonic and magmatic evolution process of the Bainaimiao subduction belt formed in the southward subduction of the Wenduermiao tectonic belt in the north. Reflecting the latest results of the 1∶50 000 regional geological survey, the database holds important scientific value regarding the Paleozoic tectonic evolution of the Wenduermiao orogenic belt. It may also serve as an important reference for subsequent geological surveys in the region. As the first pilot map of China Geological Survey to apply comprehensive regional geological survey mapping, the present project represents the first time to realize whole process field investigation in China’s regional geological surveys.

依据《区域地质调查技术要求（1∶50000）》（DD 2019–01）及其他统一标准与规范，充分利用1∶20万区域地质与1∶5万矿产调查数据，采用数字地质调查系统（Digital Geological Survey System，DGSS），结合Spot、ETM、Aster等遥感影像，通过持续验证与修正构造及岩性边界，编制完成内蒙古北六神庙幅（K49E011021）1∶5万地质图。作为内蒙古温都尔庙-白乃庙地区具有重要参考价值的成果，该图件详细提供了白乃庙岛弧带的岩石组成与构造组合信息。本次研究重新划分了志留系、二叠系、白垩系等沉积地层类型，并将区内侵入岩划分为四期，建立了较为完整的构造演化序列。该图件数据库包含3个非正式填图单元、10个正式地层单元、4期岩浆事件与2期构造变形，同时收录176件全岩分析样品数据及10件锆石U-Pb测年数据，数据体量达28.9 MB。该图件详细阐明了受北部温都尔庙构造带向南俯冲作用形成的白乃庙俯冲带的构造与岩浆演化过程。该数据库反映了1∶5万区域地质调查的最新成果，对于温都尔庙造山带的古生代构造演化研究具有重要科学价值，同时可为区内后续地质调查工作提供重要参考。作为中国地质调查局首个开展综合区域地质调查填图的试点图幅，本项目首次实现了我国区域地质调查全流程野外实地调查。