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| Main achievements in supplemental regional geological survey of 1∶250 000 Datong Sheet |
| ZHANG Zhaoqi, WANG Quan, WEI Yansheng, LIU Chengru, YANG Wubao, DUAN Chunsen, YANG Yaohua |
| Shanxi Institute of Geological Survey, Taiyuan 030001, China |
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Abstract The supplemental regional geological survey project of 1∶250 000 Datong Sheet has got productive achievements. (1) The division of tectonic units and the mineralogical compositions were studied, and characteristics of deformation and metamorphism on different tectonic units were also investigated. Evolution sequence and model of Early Precambrian tectonic events were determined. The Datong sheet area tectonic history was established. (2) A brand new view for rediscovering and deconstruction that Jining Group is consisted of metamorphic plutonic and metamorphic superficial crust rocks was proposed. Detailed investigation was carried out on the sedimentary layer in the area. The stratigraphic framework was established comprehensively and systematically. New data was collected on chronostratigraphic and biostratigraphic division.(3) The metamorphic plutonite in the sheet has been divided into four magmatic belts. Deconstruction and division for metamorphic plutonite in each belt has been done.(4) The spatial, petrochemical and geochemical characteristics for Mesozoic intrusive rocks in the area were discovered. The petrogenesis and tectonic background were analyzed.(5) Comprehensive and systematic research on metamorphism characteristics, metamorphic facies zone division and the characteristics of metamorphic minerals of Early Precambrian metamorphic rocks has been completed. The mineral assemblage and generation relationship on different massif has been ascertained. (6) The tectonic framework in the sheet was established by systematic research on tectonic features. The Early Precambrian structure-deformation styles were compartmentalized into four-time deformations belonging to Wutai and Luliang deformation-phase. The authors identified the matching relationship on fractures with different directions, phases and characters in the basins by investigating the Mesozoic tectonics in the area, and clarified the spatial distribution, properties, fracture combination and movement characteristics of the large-scale Majiatan thrust nappe belt located in western margin of Datong basin. This paper has great significance for research of Shanxi Meso-Cenozoic basin’s development.
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Received: 16 June 2016
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2017, Vol. 4 
