中国地质调查局:安徽省歙县混杂岩带(H50E013018,H50E013019和H50E014018图幅之内)1∶50000专题地质图数据库

安徽省皖南歙县混杂岩带(H50E013018,H50E013019和H50E014018图幅之内)1:50000专题地质图数据库是按《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，对混杂岩带物质组成和结构构造进行了详细解剖，查明了蛇绿构造混杂岩带中岩块和基质的时代、岩石组合类型及其构造属性，并厘定出820~860 Ma和800~760 Ma两期俯冲增生杂岩，构建了扬子东南缘新元古代三阶段俯冲增生的弧盆演化模型。本数据库包含31个沉积地层单元、53个变质岩地层单元和8个侵入岩单元，数据量约为158 MB。该数据库充分反映了皖南歙县蛇绿构造混杂岩带1:50000专题地质调查的最新成果，为揭示扬子东南缘新元古代洋-陆转换过程及其与成矿作用关系提供了有力的基础地质支撑。

The 1:50000 thematic geological map database of the mélange zone in Shexian County, southern Anhui Province (within map sheets H50E013018, H50E013019 and H50E014018) was developed in accordance with the "Technical Requirements for Regional Geological Survey (1:50000)" and unified geological industry standards. It was constructed based on fully collecting and utilizing regional geological survey data at scales of 1:200000, 1:250000 and 1:50000, conducting field geological mapping and database construction via the Digital Geological Survey System (DGSS), and adopting a method combining indoor and field mapping and compilation work. Through the development of this database, detailed anatomical analyses were performed on the material composition and structural fabrics of the mélange zone; the ages, rock assemblage types and tectonic attributes of blocks and matrix within the ophiolitic tectonic mélange zone were clarified, two stages of subduction-accretion complexes with ages of 820–860 Ma and 800–760 Ma were defined, and a three-stage subduction-accretion arc-basin evolution model for the Neoproterozoic southeastern margin of the Yangtze Block was established. This database contains 31 sedimentary stratigraphic units, 53 metamorphic stratigraphic units and 8 intrusive units, with a total data volume of approximately 158 MB. It fully reflects the latest achievements of the 1:50000 thematic geological survey on the Shexian ophiolitic tectonic mélange zone in southern Anhui, providing robust basic geological support for revealing the Neoproterozoic ocean-continent transition process and its correlation with mineralization on the southeastern margin of the Yangtze Block.