Tectonic Evolution of the Early Mesozoic Xuefengshan Belt： Insights from Structural Analysis and Geochronological Constraints

详细信息   

• 责任者：Chu Yang (State Key Laboratory of Lithospheric Evolution ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Belting 100029 ; China) ; Lin Wei
• 刊名：Chinese Journal of Geology
• 出版年：2011
• 卷期：46(1)
• 关键词：构造演化 ; structural evolution ; 湖南 ; Hunan Province
• 页码：p.146-160
• 图表：5 illus., 52 refs.
• 分类号：0300
• issnNo：ISSN0563-5020
• isbnNo：CN11-1937/P

摘要

In the center of the South China Block, in Hunan Province, the Xuefengshan Belt provides a well-exposed example of intracontinentat orogens. Detail field observations indicate that the Xuefengshan belt can be divided into：1) the western outer zone, characterized by km-scale box-fold structure;  2) the central Xuefengshan zone, where the dip of the cleavage surface exhibits a fan-like pattern, separated from the western outer zone by the Xuefengshan main thrust, the most deformed and metamorphosed region in this belt;  and 3) and the eastern zone, deformed mainly in the brittle-ductile level, characterized by top-to-the-NW structures and also some back-folding structures.  The tectonic evolution of the Early Mesozoic Xuefengshan Belt is possibly originated by the continental subduction in response to the northwest directed subduetion of the Pacific plate.