中国地质调查局:内蒙古兴安幅(L51E004003)1∶50000地质图数据库

内蒙古兴安幅（L51E004003）1∶50 000地质图在充分利用1：200 000万大黑沟幅区域地质资料的基础上，根据中国地质调查局DZ/T 0001-91 《区域地质调查总则（1:50000）》、DZ/T 0158-95《浅覆盖区区域地质调查细则(1:50000)》、GB/T 17412.1-1998《火成岩岩石分类和命名方案》、GB/T 17412.2-1998《沉积岩岩石分类和命名方案》、GB/T 17412.3-1998《变质岩岩石分类和命名方案》，采用数字化系统（RgMapping）包括填图系统和剖面系统，采集各类数据，结合物探、化探、遥感及探槽工程等手段综合填绘，系统的编制了内蒙古兴安幅地质图，并依据《数字地质图空间数据库标准》（DD 2006—06）建立了数据库。本数据库共包含7个正式地层单位，4个第四系成因单位，2个侵入岩填图单位，4期火山活动和2个构造层次。共采集薄片样品225件，岩石全分析样品22件，全岩K-Ar法同位素测年1件，化学分析样品3件。图幅数据库为内蒙古兴安幅区域地质调查的综合性成果，具有最新示范性，对后续填图具有重要参考意义，同时对深入研究大兴安岭中生代火山岩与古太平洋和蒙古-鄂霍茨克洋的构造关系研究提供了基础数据支撑。

The 1:50 000 geological map of the Xing'an sheet (L51E004003), Inner Mongolia, was compiled based on the regional geological data of the 1:200 000 Daheigou sheet. Following the specifications issued by China Geological Survey, including General Principles of Regional Geological Survey (1:50000) (DZ/T 0001-91), Detailed Rules for Regional Geological Survey in Shallow Covered Areas (1:50000) (DZ/T 0158-95), Classification and Naming Scheme for Igneous Rocks (GB/T 17412.1-1998), Classification and Naming Scheme for Sedimentary Rocks (GB/T 17412.2-1998), and Classification and Naming Scheme for Metamorphic Rocks (GB/T 17412.3-1998), the digital mapping system (RgMapping, including mapping and profile modules) was adopted to collect various types of data. Comprehensive mapping was conducted by integrating geophysical, geochemical, remote sensing and trench engineering surveys. The geological map of the Xing'an sheet, Inner Mongolia, was systematically compiled, and a spatial database was established in accordance with the Standard for Spatial Database of Digital Geological Maps (DD 2006—06).

This database contains 7 formal stratigraphic units, 4 Quaternary genetic units, 2 intrusive rock mapping units, 4 phases of volcanic activity, and 2 tectonic levels. A total of 225 thin section samples, 22 whole-rock chemical analysis samples, 1 whole-rock K-Ar isotopic dating sample, and 3 chemical analysis samples were collected.

The sheet database is a comprehensive achievement of the regional geological survey of the Xing'an sheet, Inner Mongolia, with up-to-date demonstrative value. It provides important reference significance for subsequent geological mapping, and also offers fundamental data support for in-depth studies on the tectonic relationship between Mesozoic volcanic rocks in the Greater Khingan Mountains and the Paleo-Pacific and Mongolia-Okhotsk Oceans.