中国地质调查局: 郯庐断裂带泗洪地区刘圩幅(I50E015017)1∶50 000地质图数据库

江苏刘圩幅(I50E015017) 1∶50 000地质图数据集由系统库、地质图及空间数据库、成果报告及附图附表组成。该图幅在充分利用前人调查研究资料基础上，采用遥感地质解译、地球物理与地质钻探勘探、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，对区内郯庐断裂带空间结构、新近纪与第四纪沉积特征、构造活动性等进行了详细的调查。通过构造地貌解析、构建地球物理和地质钻探联合剖面、露头尺度解剖，查明了郯庐断裂带泗洪地区深部及地表出露特征、新近系与第四系三维结构，结合年代学研究，发现F₂断层晚更新世活动证据。恢复了区域晚中生代以来构造和古地理古环境演化历史，划分了区域白垩纪断陷沉降、古近纪挤压隆升、新近纪伸展断陷和晚第四纪以来的再次挤压隆升共4期构造演化阶段。提出晚第四纪区域由伸展断陷向挤压隆升的构造转换事件。图幅数据库是刘圩幅区域地质调查的综合性成果，由主图和角图构成，并附简要说明，涵盖了区内新元古代、中生代、新生代沉积(岩)地质体及其构造属性特征，充分反映了该地区自中生代以来的构造演化与沉积响应过程、新构造与活动构造特征，为研究郯庐断裂带深部结构与构造演化、活动构造与地震防灾等提供基础数据。

The 1:50,000 geological map dataset of the Liuwei sheet (I50E015017), Jiangsu Province consists of a systematic library, geological maps and spatial database, final reports, accompanying figures and tables. Based on full utilization of previous survey and research data, this map sheet adopted a combination of multiple methods including remote sensing geological interpretation, geophysical and geological drilling exploration, route geological survey, measured sections and large-scale mapping, and conducted detailed investigations on the spatial structure of the Tan-Lu Fault Zone within the area, sedimentary characteristics of the Neogene and Quaternary, tectonic activity, etc. Through tectonic geomorphology analysis, construction of combined geophysical and geological drilling sections, and outcrop-scale dissection, the deep and surface exposure characteristics of the Tan-Lu Fault Zone in the Sihong area, as well as the three-dimensional structure of the Neogene and Quaternary systems, were identified. Combined with chronology research, evidence of Late Pleistocene activity of the F₂ fault was discovered. The regional tectonic and paleogeographic-paleoenvironmental evolution history since the Late Mesozoic was reconstructed, and four stages of tectonic evolution were divided: Cretaceous rift subsidence, Paleogene compression-uplift, Neogene extensional rifting, and re-compression-uplift since the Late Quaternary. A tectonic transition event from extensional rifting to compression-uplift in the region during the Late Quaternary was proposed. The map sheet database is a comprehensive achievement of the regional geological survey of the Liuwei sheet, composed of the main map and corner maps, with a brief description attached. It covers the Neoproterozoic, Mesozoic, Cenozoic sedimentary (rock) geological bodies and their tectonic attribute characteristics within the area, fully reflecting the tectonic evolution and sedimentary response processes since the Mesozoic, as well as the characteristics of neotectonics and active tectonics in this region. It provides basic data for studies on the deep structure and tectonic evolution of the Tan-Lu Fault Zone, active tectonics and earthquake disaster prevention, and other related research.