Formation and Evolution of Ramp Structural System of Mesozoic And Paleozoic in The Eastern Edge of Middle Yangtze Region

详细信息   

• 责任者：She Xiaoyu (Key Laboratory of Exploration Technologies for Oil and Gas Resources ; Ministry of Education ; Yangtze University ; Jingzhou 434023 ; China) ; Ding Xiaohui
• 刊名：Chinese Journal of Geology
• 出版年：2012
• 卷期：47(2)
• 关键词：上冲断层 ; upthrust ; 扬子地区 ; Yangtze Region
• 页码：p.333-346
• 图表：illus., 2 tables, 23 refs.
• 分类号：0300
• issnNo：ISSN0563-5020
• isbnNo：CN11-1937/P

摘要

During the time of Late Triassic to Early Cretaceous, owning to the strong compression of SW-trending Dahongshan nappe region and NW-trending Jiangnan-Xuefeng overthrust region, the eastern edge of the middle Yangtze region became the transpressional slim ramp tectonic system. For the influence of the internal two detachment fault system in hypo and epi metamorphic rock crystallizine basement,the two nappe regions were formed. It contributed to sedimentary cover compression and multiple detachments nappe along the base of the Silurian, the base of the Devonian, and formed a variety of compression and transpressional tectonic structural type and tectonic style. From orogeny belt to Intra-basin, Tectonic deformation was Gradual-Change, that is asymmetry obduction （root zone ） -wedges overthrust （middle zone）- decollement nappe（front zone）-ramp belt. Continued compressive-torsional action resulted in a series of NE-trending right-lateral Strike-slip faults segmented ramp structure system. Compression turned into extension environment in Late Cretaceous-Paleaogene, negative fault inversion slipped back and became major fault of fault depression in Mesozoic and Cenozoic. It is generally believed that the front zone of Dahongshan nappe region is already in line with Tonghaikou-Yanglinwei-Hannan. Influenced by Honghu strike-slip fault and Tonghaikou fault slipped back, the main body accepts the Early Cretaceous-Neogene sedimentary and only remains the curvilinear structural belt tectonic features.