A Geometrical and Kinematic Analysis of the Early-Mesozoic Yueyang-Chibi Fold-Thrust Belt in <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place w:st="on">Southern Jiangnan</st1:place> Orogen, Hunan Province <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

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A Geometrical and Kinematic Analysis of the Early-Mesozoic Yueyang-Chibi Fold-Thrust Belt in Southern Jiangnan Orogen, Hunan Province

详细信息

责任者：Bai Daoyuan (Hunan Institute of Geological Survey ; Changsha 410011 ; China) ; Ni Yanjun
刊名：Geology in China
出版年：2009
卷期：36(5)
关键词：断裂带 ; fracture zones ; 褶皱带 ; fold belts ; 湖南 ; Hunan Province ; 湖北 ; Hubei Province
页码：p.996-1009
图表：20 illus., 32 refs.
分类号：0300
issnNo：ISSN1000-3657
isbnNo：CN11-1167/P

摘要

///The Early Mesozoic (Late Indosinian-Early Yanshanian) Yueyang-Chibi fold-thrust belt is located in the border area between the Jangnan orogen and the middle Yangtze foreland basin. Detailed geological mapping was conducted to reveal the structural geometry and kinematics of the belt. According to the theory of fault-related folding and on the basis of near-surface geological characteristics, the geotectonic section structure and the deformation dynamic mechanism of the Yueyang-Chibi fold-thrust belt are considered to be as follows: 1) several detachment faults and south-dipping thrust faults from the south and the lower part to the north and the upper part make up a step-shaped thrust-fault system, which controls the slip-thrust of tectonic blocks, structural framework and deformation zones; 2) the Guozhen syncline is a basement-detachment fold, the Guanshan anticline has characteristics of a double detachment fold and a fault-propagation fold, the Nieshi anticline is a fault-bending fold, the Linxiang syncline is a passive fold controlled by anticlines on both sides, with detachment faults along the unconformity on the two wings of the syncline; 3) the trough-like folds of the Yueyang-Linxiang basement detachment-thrust belt are mainly controlled by fold-basement detachment and horizontal compression, with its formation mechanism similar to that of the pinch and swell fold.

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