DOI: 10.35080/data.a.2020.p6
title: 1∶50 000 Geologic Map Database of Yueyashan Map Sheet, Inner Mongolia
title: 内蒙古月牙山幅1∶50 000地质图数据库

description: The  1∶50  000  geologic  map  database  of  Yueyashan  map  sheet  (K47E015010), Inner Mongolia (also referred to as the Database) was comprehensively mapped and prepared according to the technical standards Technical Requirements for Regional Geological Survey (Scale: 1∶50 000) and Spatial Database Establishment Code of Digital Geologic Maps.  In this case, the latest mapping ideas of orogenic belts were followed, a digital geological survey system  (DGSS)  was  adopted,  and  the  1∶10  000  large-scale  mapping  of  ophiolitic  melange belts were combined. Furthermore, the structural and lithologic boundaries in Yueyashan map sheet were continually verified by making full use of the results of 1:200 000-scale regional geological surveys and 1∶50 000-scale mineral surveys as well as the remote sensing images of multiple types such as Spot, ETM, and Aster. As a result, the geologic maps in the Database were finally prepared according to the structural framework of the map sheet, and serve as part of the first-batch exploratory results mapped under the guidance of orogeny theory in Beishan area. In this Dataset, the material composition and structural association characteristics of the Baiyunshan  ophiolites  were  plotted  in  the  maps  in  detail,  the  sedimentary  formations  of  the middle  Neoproterozoic,  Sinian,  Cambrian,  Ordovician,  and  Devonian  were  reclassified,  the intrusions  in  the  map  sheet  were  divided  into  four  sequences  (i.e.,  the  middle  Silurian sequence, early Devonian sequence, late Devonian sequence, and early Permian sequence), and a  comparatively  complete  tectonic  evolution  sequence  was  also  established.  This  Database consists  of  the  data  and  files  of  Yueyashan  map  sheet,  including  the  data  of  three  informal mapping units, eight formal stratigraphic units, four stages of magmatic events, and four stages of tectonic deformation, with a size of 26.7 MB. In addition, three hundred fifty-eight samples for  thin  slice  petrographic  observation,  eighty-four  samples  for  whole-rock  geochemistry analysis and fourteen samples for zircon U–Pb dating were collected, and two mineralized sites were discovered in this work, all of which were also integrated into the database. These data reflect the demonstrative results of a 1∶50 000-scale geological survey of an orogenic belt, and can be used as a reference for subsequent mapping of orogenic belts. In addition, tectonic and  magmatic  evolutionary  history  of  the  subduction  process  was  highlighted  in  the  data, which is of scientific research value for the early Paleozoic evolution of Beishan orogenic belt.
description: 内蒙古月牙山幅（K47E015010）1∶50 000地质图数据库是根据《区域地质调查技术要求（1∶50 000）》和《数字地质图空间数据库》技术标准，按照最新造山带填图思路，采用数字地质调查系统（DGSS），结合蛇绿构造混杂岩带1∶10 000大比例尺填图综合填绘而成。在充分利用1∶200 000区域地质、1∶50 000矿产调查成果的基础上，结合Spot、ETM、Aster等多种遥感影像对构造及岩性边界不断验证，最终以构造格架为纲而成图，是北山地区以造山带理论指导填图的首批探索性成果图件之一。图件详细填绘了白云山蛇绿岩的物质组成和构造组合特点，对中–新元古界、震旦系、寒武系、奥陶系、泥盆系沉积建造类型进行了重新划分，把图幅内侵入岩划分为中志留世、早泥盆世、晚泥盆世与早二叠世4个序列，并构建了相对完善的构造演化序列。本数据库是月牙山幅配套的数据文件，包含3个非正式填图单位、8个正式地层单位、4期岩浆事件和4期构造变形，数据量为26.7 MB。采集薄片分析样品358件，岩石全分析样品84件，锆石U–Pb年龄样品14件，矿化点2处。这些数据反映了1∶50 000造山带地质调查示范性成果，对后续造山带填图具有参考和借鉴意义，同时细化了俯冲过程的构造、岩浆演化规律，对北山造山带早古生代演化具有重要的科学研究价值。