Spatial Database of 1∶50 000 Digital Geological Maps of Wanjia Town (J50E021024), Nancun Town (J51E021001), Gaomi City (J50E022024) and Lancun Town (J51E022001) Map-sheets, Shandong Province

Wanjia—Lancun area in Shandong Province is located between Laiyang depression and Zhucheng depression in Jiaolai Basin. The spatial database of 1∶50 000 digital geological maps of Wanjia Town (J50E021024), Nancun Town (J51E021001), Gaomi City (J50E022024), and Lancun Town (J51E022001) map sheets, Shandong Province (also referred to as the Database) was established according to the unified standards and requirements of the ‘Guidelines for 1∶50 000-Scale Regional Geological Survey in Quaternary Coverage Area (Trial)’ and the ‘Guidelines for 1∶50 000-Scale Regional Geological Survey (Trial)’ by relying on the project titled ‘1∶50 000-Scale Regional Geological Survey of Wanjia Town, Nancun Town, Gaomi City, and Lancun Town Map Sheets, Shandong Province’ initiated by the China Geological Survey in 2016. During development of the Database, previous geological data were fully utilized, a digital mapping system was adopted for field geological mapping, and standard 1∶50 000 geological maps and work instructions were developed by means of indoor map preparation combined with field geological mapping. The aim of the Database is to complete the lithologic mapping of early Cretaceous strata, including Yangjiazhuang Formation and Ducun Formation of Laiyang Group, Bamudi Formation of Qingshan Group, and Xingezhuang Formation of Wangshi Group. A volcanic edifice was discovered for the first time in Xingezhuang Formation of Wangshi Group, and the zircon U–Pb ages of volcanic intercalations in Xingezhuang Formation were determined to be early Cretaceous. The paleogeographic characteristics of Cretaceous lithofacies of Lidangjia—Mashan dome was restored according to the previous drilling data of Well JC–1, Well JC–2 and Well JC–3. Furthermore, the sedimentary tectonic framework of Wanjia—Lancun area was established. The database contains four standard 1∶50 000 geological maps, with a data size of about 22.3 MB. LA-ICP-MS zircon U–Pb isotopic ages of three volcanic rocks, and three optically stimulated luminescence (OSL) datings and four 14C isotopic ages of Quaternary were obtained in Jiaolai Basin The maps were prepared under the CGCS2000 national geodetic coordinate system and Gauss-Kruger projection. The Database fully reflects the results of 1∶50 000-scale regional geological survey and will provide basic geological maps for research, environment and energy exploration in Wanjia—Lancun area, and therefore, is of great significance.