Superposed Buckle Folding in the Northwestern Daba Mountain, <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place w:st="on">Central China</st1:place> <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

Superposed Buckle Folding in the Northwestern Daba Mountain, Central China

详细信息

责任者：Zhang Zhongyi (Institute of Geomechanics ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Dong Shuwen
刊名：Acta Geologica Sinica
出版年：2009
卷期：83(7)
关键词：叠加褶皱 ; superposed folds ; 大巴山 ; Daba Mountains
页码：p.923-936
图表：12 illus., 35 refs.
分类号：0300
issnNo：ISSN0001-5717
isbnNo：CN11-1951/P

摘要

Late Jurassic superposed folds developed in the foreland structural belt of Daba Mts. are one of the most typical examples of regional or map-scale buckle superposition structures in the world, characterized by very conspicuous and spectacular interference pattern. A 1:10 000 geological mapping was conducted in the northwestern Dabashan where the interference between two almost intersecting folds occurs, aiming at detailed geometric and kinematic analysis of the varied inventory of outcrop-scale cross-folds. The structural analysis indicates that the two discrete folding phases, respectively, related to late Middle Triassic and Late Jurassic isolated tectonic events are mainly responsible for shallow buckle folds in the study area. The results show that the SN- to NNW-trending folds (F₂) orthogonally overprint the early EW-trending ones (F₁). The superposed deformation mainly causes the juxtaposing and refolding.

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