中国地质调查局: 津冀交界三河县幅(J50E001013)1∶50000地质图数据库

津冀交界三河县幅（J50E001013）地质图数据库是按《1∶50 000区域地质调查技术要求》(DD 2019—01)和借鉴国内外第四纪地质填图经验，在充分搜集和利用钻探、石油物探、区域航磁、区域重力资料的基础上，通过物探、钻探、遥感、路线地质调查、剖面测量等技术手段，采用数字填图系统(DGSS)建设而成。地质图采用“时代+成因+沉积相（微地貌）+岩性”的方法将区内表层第四系划分为16个填图单位。依托基准孔，建立了本区第四系多重地层划分方案，通过联孔剖面，构建了区内第四纪三维地质结构框架和岩相古地理，并建立了50m以浅岩性三维地质结构属性模型、400m以浅第四系沉积相三维模型；查明了区内三河—黄土庄断裂、香河—皇庄断裂等隐伏断裂的位置及其第四纪活动性；此外，对区内表层沉积物典型的岩石组合特征、河流阶地、古人类遗迹、全新世河流变迁、前新生代基底结构构造等也进行了系统表达。该数据库是京津冀山前冲洪积平原区1∶50 000第四纪覆盖区填图试点项目的重要成果，为华北平原北部第四纪沉积环境与地质演化研究提供了依据与关键性的基础数据，同时对华北平原区地质填图工作也具有重要的借鉴意义。

The geological map database of Sanhe County sheet (J50E001013) at the border of Tianjin Municipality and Hebei Province was developed based on the full collection and utilization of drilling, petroleum geophysical, regional aeromagnetic and regional gravity data, in accordance with the Technical Requirements for 1:50 000 Regional Geological Survey (DD 2019—01) and drawing on domestic and international experience in Quaternary geological mapping. It was constructed using technical means including geophysical exploration, drilling, remote sensing, route geological survey, profile measurement, and the Digital Geological Survey System (DGSS). The geological map divides the surface Quaternary strata in the study area into 16 mapping units via the method of "age + genesis + sedimentary facies (micro-landform) + lithology". Relying on reference boreholes, a multiple stratigraphic division scheme for the Quaternary strata in this area was established. Through connected borehole sections, the Quaternary 3D geological structure framework and lithofacies paleogeography of the area were constructed, and 3D geological structure attribute models for lithology shallower than 50m as well as 3D models of Quaternary sedimentary facies shallower than 400m were developed. The locations and Quaternary activities of buried faults including the Sanhe-Huangtuzhuang Fault and Xianghe-Huangzhuang Fault in the area were identified. In addition, typical rock assemblage characteristics of surface sediments, river terraces, ancient human relics, Holocene river channel migrations, pre-Cenozoic basement structure and tectonics in the area were also systematically documented. This database is a key achievement of the 1:50 000 Quaternary-covered area mapping pilot project in the piedmont alluvial-proluvial plain of the Beijing-Tianjin-Hebei region. It provides critical basic data and scientific basis for research on Quaternary sedimentary environments and geological evolution in the northern North China Plain, and holds important reference value for geological mapping work across the North China Plain.