DOI: 10.35080/agdd.2024.004
title: China Geological Survey: 1:50 000 Geological Map of Hadatu Map-sheet (K50E004023), Inner Mongolia
title: 中国地质调查局：内蒙古哈达图幅(K50E004023)1∶50 000地质图数据库

description: The 1: 50 000 Geological Map of Hadatu Map-sheet (K50E004023), Inner Mongolia was compiled in accordance with the “Technical Requirement for Regional Geological Survey (1: 50 000)” (DD2019−01), employing geological mapping techniques and methods in shallow overed areas. It was completed by fully leveraging the outcomes of 1:200 000 and 1:250 000 regional geological surveys, in conjunction with geophysical, geochemical, remote sensing, and drilling data. This survey integrated remote sensing, shallow drilling, and surface geological investigations to detail 15 Quaternary genesis types and identify 12 active faults. A late Pleistocene large paleolake (153~71 Ka BP) was newly identified, and the map expressed three levels of lacustrine terraces, discovering a late mammoth-woolly rhinoceros fauna and Neolithic ancient cultural layer in the sedimentary layer of the level II terrace of paleolake. Investigations of the paleolake expansion-contraction polycycle sediments confirmed that the paleolake completely recorded the last interglacial climate event (MIS5 128~75 Ka BP). Comparative studies of the Quaternary in the Xar Moron River basin established a climatic framework for the Horqin Sandy Land in the past 170 000 years, constructing three phases of desertification expansion in the Horqin Sandy Land since the late Pleistocene. The database, formatted in DGSDIS, includes 6 rock mapping units, 15 Quaternary genesis mapping units, and 5 volcanic eruption events. It contains 174 pieces of geological polygon data, 427 pieces of geological boundaries data, 23 pieces of drilling data, 29 pieces of attitude data, 89 pieces of sample data, 3 pieces of zircon U-Pb dating data, and 9 pieces of optically stimulated luminescence (OSL) dating data, totaling 313 MB of data. This survey has achieved a series of original results, exploring mapping methods for the Horqin Sandy Land overburden area and serving as a model for geological surveys in overburden areas. The database comprehensively records the foundational data of the survey work and systematically expresses the new findings obtained from this investigation. The data is accurate, detailed, rich in information, and conveniently and quickly retrievable, providing foundational geological information for basic geological surveys, national spatial planning, geohazard prevention, ecological civilization construction, and construction projects.
description: 内蒙古哈达图幅(K50E004023) 1∶50 000 地质图是遵循《区域地质调查技术要求(1∶50 000)》(DD2019—01)规范要求，采用浅覆盖区填图技术理论和方法，结合物化遥及钻孔资料，填制完成的重要成果图件。本次工作主要成果为详细划分了15个第四系成因类型，确定12条活动断层。新识别出晚更新世古大湖（153~71 Ka BP），图面表达了3级湖相阶地，并在古湖Ⅱ级阶地沉积层中新发现猛犸象-披毛犀晚期动物群和新石器古文化层；通过古湖扩张-萎缩多旋回沉积物的调查，确定古湖完整记录了末次间冰期气候事件（MIS5 128-75 Ka BP）。开展西拉木伦河流域第四系对比研究，建立了科尔沁沙地17万年以来的气候格架，构建了科尔沁沙地晚更新世以来3期沙漠化扩张过程。该图幅数据库数据为DGSDIS格式，内容包含6个岩石填图单位，15个第四系成因填图单位，5期火山喷发事件，其中地质体面实体数据174个，地质(界)线数据427个，钻孔数据23个，产状数据29个，样品数据89个，锆石U–Pb年龄数据3个，光释光测年数据9个，数据量为313 MB。该图幅是执行新区域地质调查规范完成的填图成果，取得了一系列原创性成果，探索了科尔沁沙地覆盖区的填图方法，对覆盖区填图具有示范作用，可为基础地质调查、国土空间规划、地质灾害防治、生态文明建设及工程施工等提供基础地质资料。