中国地质调查局: 广东省企水镇幅(F49E020008)1∶50 000地质图数据库

广东企水镇幅（F49E020008）1∶50 000地质图根据《1∶50 000区域地质调查技术要求》 （DD 2019—01）和地质行业的统一标准及要求，在充分利用已有调查资料的基础上，采用数字地质调查系统（DGSS），通过野外调查填绘而成。该数据库包含地质路线325.3 km，地质点265个，地质钻孔13个，累计进尺604.3 m，槽型钻揭露点83个；实测火山岩地层剖面3条，累计长度10.7 km；音频大地电磁测深6.95 km，高密度电阻率3.5 km。通过本数据库的建立，整合利用已有的地质资料，将雷州半岛地区第四纪地层进行了岩石地层、生物地层、年代地层多重地层划分与对比，重新厘定了石峁岭组的时代；采用岩性−岩相−火山机构填图，划分了火山活动旋回、火山岩相和火山机构，并结合琼北火山岩的测试数据对雷琼地区火山岩的岩浆源区、岩石成因、以及岩浆活动与构造的关系进行了探讨。采用音频大地电磁测深和高密度电法等物探手段对四会—吴川断裂往南西延伸的北支断裂，即坡头—海康港断裂，在调查区内的展布特征进行了探查。上述地质资料和研究成果对提高调查区基础地质研究水平及服务地方经济建设具有重要意义。

The 1∶50 000 geological map of the Guangdong Qishui Town Sheet (F49E020008) was compiled via field survey and mapping using the Digital Geological Survey System (DGSS), based on full utilization of existing survey data, in accordance with the Technical Requirements for 1∶50 000 Regional Geological Survey (DD 2019—01) and unified industry standards and requirements for geology. This database includes 325.3 km of geological traverses, 265 geological stations, 13 geological boreholes with a cumulative footage of 604.3 m, 83 slot drill exposure points, 3 measured volcanic stratigraphic sections with a total length of 10.7 km, 6.95 km of audio magnetotelluric sounding data, and 3.5 km of high-density resistivity data. Through the construction of this database, existing geological data were integrated to carry out multiple stratigraphic division and correlation including lithostratigraphy, biostratigraphy and chronostratigraphy for Quaternary strata in the Leizhou Peninsula, and the age of the Shimaoling Formation was redefined. Using lithology-lithofacies-volcanic edifice mapping, volcanic activity cycles, volcanic lithofacies and volcanic edifices were classified. Combined with test data of volcanic rocks in northern Hainan, this study discussed the magma source area, petrogenesis of volcanic rocks in the Leiqiong area, as well as the relationship between magmatic activity and tectonics. Geophysical prospecting methods including audio magnetotelluric sounding and high-density resistivity method were applied to detect the distribution characteristics of the northern branch fault of the Sihui-Wuchuan Fault, namely the Potou-Haikang Port Fault, within the survey area. The aforementioned geological data and research outcomes are of great significance for improving the basic geological research level of the survey area and supporting local economic construction.