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标题：A challenge to the concept of slip-lines in extrusion tectonics
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作者：Yadong Zheng ; Erchie Wang ; Jinjiang Zhang 等
期刊名称：Geoscience Frontiers
印刷版ISSN：1674-9871
出版年度：2011
卷号：2
期号：1
页码：23-34
DOI：10.1016/j.gsf.2010.11.006
语种：English
出版社：Elsevier
摘要：AbstractWide-open V-shaped conjugate strike-slip faults in Asia are typically related to extrusion tectonics. However, the tectonic model based on the slip-line theory of plasticity has some critical problems associated with it. The conjugate sets of slip-lines in plane deformation, according to the theory of plasticity should be normal to each another but, in reality, the angles between the conjugate strike-slip faults, which are regarded as slip-lines in extrusion tectonics in the eastern Mediterranean, Tibet-middle Asia, China and the Indochina Peninsular regions, are always more than 90° (on average ∼110°) in the direction of contraction. Another problem is that the slip-line theory fails to explain how, in some cases, e.g., in the Anatolian area in the eastern Mediterranean, the extrusion rate is much higher than the indent rate. The two major problems are easy to solve in terms of the Maximum-Effective-Moment (MEM) Criterion that predicts that orientations of the shear zones are theoretically at an angle of 54.7° and practically at angles of 55°±10° with the σ1- or contractional direction. The orientations of the strike-slip faults that accommodate extrusion tectonics are, therefore, fundamentally controlled by the MEM Criterion. When extrusion is along the MEM-orientations, the extruding rate is normally higher than the indenting rate.
关键词：KeywordsenExtrusion tectonicsSlip-lineWide-open V-shaped strike-slip faultsMEM-CriterionStrain rate