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Analysis of fault bend folding kinematic models and comparison with an analog experiment
Journal of Structural Geology ( IF 3.1 ) Pub Date : 2021-03-11 , DOI: 10.1016/j.jsg.2021.104316
Berenice Plotek , Cecilia Guzmán , Ernesto Cristallini , Daniel Yagupsky

Analog modeling of a flat-ramp-flat fault system was performed and its geometry and displacement field were compared to those of different kinematic models such as classical fault bend folding, fault parallel flow, incline-shear, curvilinear hinge, and backlimb trishear. To obtain the displacement vectors of the analog experiment, a Particle Image Velocimetry was performed. All analyzed kinematic models could explain the general configuration of the fault bend folding. However, only backlimb trishear could represent the geometry, directions of particle displacements, and relations between the displacements’ vectors. We propose in this paper that the combination of different asymmetry angles and different apical angles of the backlimb trishear model for each bend in a fault bend fold could be a very versatile and general kinematic model for simulating fault bend folds. Backlimb trishear apical angle can be used to control the shape of the hinges of a fold, while the asymmetry can be used to convolve the velocity of the particles above the fault. Both apical angle and asymmetries different from zero imply thickness changes. Fault bend folds with high inclination forelimbs can be reproduced with high positive asymmetries in the anticline bends of the fault.



中文翻译:

断层弯折运动学模型分析及与模拟实验的比较

进行了平坦匝道-平坦断层系统的模拟建模,并将其几何形状和位移场与不同运动学模型(例如经典断层弯折,断层平行流,倾斜剪切,曲线铰链和后肢三剪切)的几何形状和位移场进行了比较。为了获得模拟实验的位移矢量,进行了粒子图像测速。所有分析的运动学模型都可以解释断层弯折的一般构造。但是,只有后肢三切变可以表示几何形状,粒子位移的方向以及位移矢量之间的关系。我们在本文中提出,对于断层弯折中的每个弯道,后肢三剪切模型的不同不对称角度和不同的顶角的组合可能是模拟断层弯折的非常通用的运动学模型。后肢三剪切顶角可用于控制褶皱的铰链形状,而非对称性可用于使断层上方的粒子速度回旋。顶角和不为零的非对称性均表示厚度变化。高倾斜前肢的断层弯曲褶皱可以在断层的背斜弯曲中以高的正不对称性再现。顶角和不为零的非对称性均表示厚度变化。高倾斜前肢的断层弯曲褶皱可以在断层的背斜弯曲中以高的正不对称性再现。顶角和不为零的非对称性均表示厚度变化。高倾斜前肢的断层弯曲褶皱可以在断层的背斜弯曲中以高的正不对称性再现。

更新日期:2021-03-21
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