中国地质调查局:吉林省白石山幅(K52E003007)1∶50000地质图数据库

吉林白石山幅（K52E003007）1∶50000地质图根据中国地质调查局《1:50000区域地质调查技术要求》（DD2019-01）、《1∶50000地质图用色标准及用色原则》（DZ/T 0179-1997）、 中华人民共和国国家标准《区域地质图图例》（GB/T958-2015）规范要求，充分利用专题成果，1∶200000、1∶250000区域地质调查、矿产勘查成果，结合物化遥资料，采用数字地质调查系统（DGSS），进行野外地质填图和数据库建设。通过地质剖面测制，地质路线调查、野外数字填图等技术手段采集地质数据，完成吉林白石山幅1∶50000地质填图373.90 km2，系统编制了该幅地质图。并依据中国地质调查局地质调查技术标准《数字地质图空间数据库标准》（DD2006-06）建立地质图数据库。地质图详细填绘了各地层单位的物质组成、构造特征，建立测区岩石地层格架，划分出10个岩石地层填图单位。本次调查工作新建大川组，为一套霓辉粗面岩组合（碱性玄武岩-粗面岩组合），与同期玄武岩发育在大陆裂谷区构成双峰火成岩组合。该组的发现为研究敦-密断裂带新近纪拉张环境下岩浆活动及演化提供新资料。根据岩石学、岩石地球化学及接触关系等特征，结合同位素测年资料，对区内出露的大面积侵入体进行解体，重新划分侵入岩填图单位，建立测区岩浆演化序列，划分出早侏罗世、渐新世二期构造岩浆事件，确立了9个侵入岩填图单位。通过对早侏罗世大冰湖沟岩体（不等粒晶洞含黑云母花岗闪长岩）的研究，发现其与区域钼多金属矿成矿作用关系密切，为地质找矿提供新线索。采用火山岩性-岩相-构造填图方法，划分出早二叠世和早白垩世两个时代三期火山活动。对区内构造形迹进行系统研究，建立区域构造格架。新发现钼矿化点2处，发现大川组碱性粗面中岩富含有稀有稀土成矿元素，为寻找稀有稀土矿产提供新资料。该幅地质图数据库采用MapGIS格式，数据量为115MB，数据库较全面地反映了本次地质调查成果，数据准确，内容翔实，可为该区在地质调查、矿产资源勘查、地质灾害防治等方面的深入研究提供基础性资料。

The 1:50000 geological map of the Jilin Baishishan sheet (K52E003007) was compiled in accordance with the specifications of the Technical Requirements for 1:50000 Regional Geological Survey (DD2019-01), Color Standard and Principles for 1:50000 Geological Maps (DZ/T 0179-1997) issued by China Geological Survey, as well as the National Standard of the People's Republic of China Legends for Regional Geological Maps (GB/T 958-2015). Making full use of thematic results including 1:200000 and 1:250000 regional geological survey and mineral exploration achievements, combined with geophysical, geochemical and remote sensing data, field geological mapping and database construction were carried out using the Digital Geological Survey System (DGSS). Geological data were collected via technical means such as geological profile measurement, geological route survey and field digital mapping, completing 373.90 km² of 1:50000 geological mapping for the Jilin Baishishan sheet, and the geological map was systematically compiled. A geological map database was established in accordance with the Spatial Database Standard for Digital Geological Maps (DD2006-06), a geological survey technical standard of China Geological Survey.

The geological map detailed the material composition and structural characteristics of each stratigraphic unit, established the lithostratigraphic framework of the survey area, and divided 10 lithostratigraphic mapping units. During this survey, the Dachuan Formation was newly established, which consists of aegirine trachyte association (alkali basalt-trachyte association), forming a bimodal igneous association with coeval basalts developed in continental rift zones. The discovery of this formation provides new data for studying magmatic activity and evolution in the Neogene extensional environment of the Dunhua-Mishan Fault Zone.

Based on petrological, petrogeochemical and contact relationship characteristics, combined with isotopic dating data, the large-scale exposed intrusions in the area were disintegrated, intrusive rock mapping units were reclassified, the magmatic evolution sequence of the survey area was established, two tectono-magmatic events of Early Jurassic and Oligocene were identified, and 9 intrusive rock mapping units were established. Through the study of the Early Jurassic Dabinghugou intrusion (unequigranular miarolitic biotite-bearing granodiorite), it was found that it is closely related to the mineralization of regional molybdenum polymetallic deposits, providing new clues for geological prospecting.

By adopting the volcanic lithology-lithofacies-tectonic mapping method, three phases of volcanic activities spanning two geological periods (Early Permian and Early Cretaceous) were delineated. Systematic research was conducted on the structural features in the area, and the regional tectonic framework was established. Two molybdenum mineralization occurrences were newly discovered, and it was found that the alkali trachyte rocks in the Dachuan Formation were rich in rare and rare-earth ore-forming elements, providing new data for the prospecting of rare and rare-earth minerals.

The geological map database is in MapGIS format with a total data volume of 115 MB. The database comprehensively reflects the achievements of this geological survey, with accurate data and detailed content, which can provide basic data for in-depth research in fields such as geological survey, mineral resource exploration and geological disaster prevention and control in this region.