Mega-fold interference patterns in the Beishan orogen (NW China) created by change in plate configuration during Permo-Triassic termination of the Altaids
作者： Zhonghua Tian , Wenjiao Xiao , Yehua Shan , Brian Windley , Chunming Han
DOI: 10.1016/J.JSG.2013.03.016
关键词: Permian 、 Zircon 、 Fold (geology) 、 Seismology 、 Geology 、 Flattening 、 Structural basin 、 Lithology 、 Clastic rock 、 Sedimentary rock 、 Paleontology
摘要: Abstract Kilometer-size fold interference patterns in the Beishan Orogenic Collage (BOC) southernmost Altaids formed by superimposition fossiliferous Permian sedimentary rocks. First-phase (F 1 ), upright and almost north-trending folds, were refolded E- to ENE-trending F 2 whose axial planes axes are vertical or subvertical. From east west there is a regional change style of from lobate–cuspate-, crescent- mushroom-shape. This variation accompanied westward decrease interlimb angle related higher percentage coarse-grained clastic rocks, suggesting dependence deformation on lithology. Axial planar slaty cleavages well developed poorly folds. The superposed folds mainly underwent flexural-slip flexural flow folding give rise lobate–cuspate pattern, crescent pattern caused flattening where sediments unconsolidated enriched fluids. two events interpreted result major plate configuration that inversion an inter-arc basin during final amalgamation BOC latest early mid-Triassic. bracketed between maximum detrital zircon age
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