内蒙古1:50000清河沟幅区域地质图数据库

1:50000 Regional Geological Map Database of the Qinghegou Map-sheet, Inner Mongolia

内蒙古1:50000清河沟幅(K47E010009)区域地质图是全国区域地质调查优秀图幅(2018)。该图幅在充分利用前人区域地质调查成果资料的基础上,采用遥感、物化探、路线地质调查、实测剖面和大比例尺填图等多种手段相结合的方法,对区内百合山蛇绿混杂岩带、沉积地层、岩浆岩以及构造变形特征等进行了详细的调查。查明了百合山蛇绿混杂岩带的空间展布、物质组成以及变质变形特征,并明确其为石炭纪俯冲带型(Supra-Subduction Zone,SSZ型)蛇绿岩;对区内岩浆岩进行了详细解体,划分出晚志留世-泥盆纪、石炭纪-早二叠世、中二叠世3期岩浆事件,建立了构造–岩浆演化序列;将区内地层以百合山蛇绿混杂岩带为界划分为2个不同的地层分区,明确了岩石组合和沉积环境差异,建立了地层综合柱状图。图幅数据库包含67件样品的地球化学分析数据和17件锆石U–Pb测年数据。本数据库是清河沟幅区域地质调查的综合性成果,由主图和图饰图廓构成,涵盖了区内沉积岩、岩浆岩、蛇绿混杂岩等多种地质体的属性特征,充分反映了该地区造山带结构和地质演化过程,可为北山地区的地质找矿和造山带精细研究工作提供基础数据支撑。

The 1:50000 regional geological map(K47E010009)of the Qinghegou MapSheet 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 SilurianDevonian,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.