河南省石门幅1:50000地质图数据库

1:50000 Geologic Map Database of the Shimen Map Sheet, Henan Province, China

河南省石门幅(I49E017018)1:50000地质图数据库是按《区域地质调查技术要求(1:50000)》和地质行业的统一标准及要求,在充分搜集和利用1:200000、1:250000和1:50000等区域地质调查工作成果资料的基础上,采用数字填图系统(DGSS)进行野外地质填图和数据库建设,并应用室内与野外填编图相结合的方法完成的。通过本数据库的建设,重点对图幅内侵入岩时代及岩石类型进行了归纳总结,将原划定的石门岩体和五垛山岩体统一归并为晚奥陶世、早志留世、中-晚志留世及志留纪末期4期岩浆活动,建立了岩浆演化序列。根据侵入岩的形成时代及其与地层接触关系,将早古生代二郎坪群大庙组和火神庙组的时代归属进行了重新厘定,将其置于寒武纪–奥陶纪。本数据库包含5个地层单元和4期岩浆岩,数据量约为10.4 MB,包括66个样品的岩石化学分析数据,19个样品的年龄数据。这些数据充分反映了1:50000区域地质调查最新成果,对该区矿产地质调查、地质灾害防治及生态环境保护等具参考和指导意义。

The 1:50000 geologic map database of the Shimen map sheet(I49 E017018),Henan Province(also referred to as the Database)was developed in accordance with the’Technical Requirements for Regional Geological Survey(Scale:1:50000)’and other unified standards and requirements in the geologic industry,of which previous 1:200000-,1:250000-and 1:50000-scale regional geological survey results were fully collected and utilized.In addition,the digital mapping system(DGSS)was adopted for geological field mapping and database building,and indoor map preparation was conducted along with field mapping.This Database was mainly built to summarize the eras and types of intrusions in the map sheet,as well as further incorporating the previously determined Shimen and Wuduoshan intrusives into the four stages of magmatic activities,specifically the Late Ordovician,Early Silurian,Mid-Late Silurian and the end of the Silurian period.As a result,the magma evolution sequence was built.Furthermore,based on the formation eras of the intrusions and the contact relationships between the intrusions and strata,the eras of the Damiao Formation and Huoshenmiao Formation of the Early Paleozoic Erlangping Group were re-determined to be of the Cambrian–Ordovician.The Database covers five stratigraphic units and four stages of magmatites,as well as rock geochemistry analytical data of 66 samples and dating data of 19 samples,with a data size of about 10.4 MB.The Database fully reflects the latest results of the1:50000-scale regional geological surveys,providing references and guidance for future mineral and geological surveys,geologic hazard prevention&control and ecological environmental protection in the Shimen map sheet area.