中国地质调查局:广西大溶江幅(G48E015010)1∶50000地质图数据库

大榕江幅（G49E015010）地质图数据库是按《1∶50 000区域地质调查技术要求》(DD 2019—01)和借鉴国内外岩溶区填图经验，在充分搜集和利用钻探、物探、区域航磁、区域重力资料的基础上，通过路线地质调查、剖面测量,并结合物探、钻探、遥感等技术手段，采用数字填图系统(DGSS)建设而成。地质图采用“时代+沉积相（微地貌）+岩性”的方法,将区内岩石地层序列划分为15个组、22个段，岀露地层自老至新有寒武系、奥陶系、泥盆系、石炭系和第四系， 以奥陶系、泥盆分布最广，第四系在图幅东部沿漓江水系展布。图幅内共完成2个钻孔，揭露了图幅内关键区域第四系厚度和结构、查明了隐伏岩溶发育特征和深度，建立了测区内第四系的三维地质模型，为岩溶系统划分提供了丰富的浅层数据资料。

Geological Map Database of Darongjiang Sheet (G49E015010) was constructed in accordance with the Technical Requirements for 1:50 000 Regional Geological Survey (DD 2019—01), drawing on the mapping experience of karst areas both domestically and internationally. It was developed based on full collection and utilization of data from drilling, geophysical exploration, regional aeromagnetic survey and regional gravity survey, through route geological survey, profile measurement, combined with technical means such as geophysical exploration, drilling and remote sensing, and using the Digital Geological Survey System (DGSS). The geological map adopts the method of "age + sedimentary facies (micro-landform) + lithology", dividing the lithostratigraphic sequence in the area into 15 formations and 22 members. The exposed strata, from oldest to youngest, include the Cambrian, Ordovician, Devonian, Carboniferous and Quaternary, among which the Ordovician and Devonian are the most widely distributed. The Quaternary strata are distributed along the Lijiang River system in the eastern part of the map sheet. A total of 2 drillholes were completed within the map sheet, which revealed the thickness and structure of the Quaternary strata in key areas of the sheet, identified the development characteristics and depth of hidden karst, and established a 3D geological model of the Quaternary strata in the survey area, providing abundant shallow data for the division of karst systems.