China Geological Survey: The 1: 50 000 Geological Map and Database of the Dasanjiazi Map-sheet in Jilin Province (K51E004023)

The geological survey of the Dasanjiazi map-sheet (K51E004023) is located in the central region of Jilin Province. It is situated in the suture zone between the northern edge of the North China Plate and the southern edge of the Siberian Plate. This survey utilized a variety of techniques, including field digital mapping, remote sensing interpretation, drilling, and comprehensive geophysical exploration. It actively explored and innovated the expression of geological mapping results. The stratigraphic sequence of the Dasanjiazi map-sheet was basically clarified, and the structural types of sedimentary rocks, intrusive rocks, and metamorphic rocks were detailed and classified. A 1: 50 000 geological map was created by adding geographic information to the structural framework of the region. Extensive fundamental geological data, covering stratigraphy, rock types, and structures, was collected, enabling a detailed analysis of the spatial and temporal distribution, material composition, and genesis of various geological bodies. The regional geological structural framework was established, forming a geological map database with a data volume of approximately 135 MB. The database contains datasets organized into categories such as basic features, complex features, independent features, and objects. It comprehensively describes the three stages of tectonic evolution in the region: the closure of the Paleo-Asian Ocean during the Carboniferous to Triassic, the development of basin-range structures from the Jurassic to Cretaceous, and the Cenozoic rift basins. The focus was placed on the graphical representation of structural framework. This work provides foundational data for Earth sciences research, energy and mineral resource exploration, and disaster prevention and mitigation efforts.

大三家子幅（K51E004023）地质调查区位于吉林省中部，处于华北板块北缘与西伯利亚板块南缘的缝合带（suture zone）内。本次调查采用野外数字填图、遥感解译、钻探及综合物探等多种技术手段，积极探索并创新了地质填图成果的表达方式。基本厘清了大三家子幅的地层序列（stratigraphic sequence），对沉积岩、侵入岩及变质岩的构造类型进行了详细划分与归类；通过在区域构造格架（structural framework）中叠加地理信息，编制完成1:50000地质图。收集了涵盖地层、岩石类型及构造的大量基础地质数据，为各类地质体的时空分布、物质组成及成因分析提供了详细依据。建立了区域地质构造格架，形成数据量约135 MB的地质图数据库，该数据库包含按基础要素、复杂要素、独立要素及对象等类别组织的数据集。全面阐述了区域构造演化（tectonic evolution）的三个阶段：石炭纪至三叠纪古亚洲洋闭合阶段、侏罗纪至白垩纪盆山构造发育阶段及新生代裂谷盆地阶段，重点突出了构造格架的图形化表达。该工作为地球科学研究、能源与矿产资源勘探及防灾减灾工作提供了基础数据支撑。