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Variations of thick-skinned deformation along tumuxiuke thrust in Bachu uplift of Tarim Basin, northwestern China
Journal of Structural Geology ( IF 2.6 ) Pub Date : 2021-01-06 , DOI: 10.1016/j.jsg.2021.104277
Zhihua Song , Liangjie Tang , Chao Liu

The curved Tumuxiuke thrust is the northeastern boundary of the Bachu uplift in the Tarim Basin. Based on the interpretation of 2D seismic reflection sections, thick-skinned deformation along the Tumuxiuke structural belt is characterized by monoclinal fault-propagation folds that alternate with push-up structures. The localization and patterns of thick-skinned deformation were controlled by pre-existing normal faults. The forward trishear modeling process further revealed the existence of short-cut thrusts branched from pre-existing normal faults and tested their effect on folding deformation. Monoclines decapitated by low-angle short-cut thrusts coexist with anticlines decapitated by high-angle inverted faults due to the selective inversion of pre-existing normal fault segments. Furthermore, the fault propagation to fault slip ratio (P/S) and the combined effect of multiple propagating thrusts determine the variations in the fold amplification rate and the growth-stratal architecture. The coeval activity of the western Kunlun orogen and the Tumuxiuke thrust in the Cenozoic indicates the far-field transmission of orogenic stress into the distal foreland. Under the approximately N–S-directed compressive stress, inverted structures in nearly W-E-striking segments exhibit monoclinal fault-propagation folds controlled by forethrusts; for the oblique NW-SE-striking segments, the transpressional deformation was partitioned into the frontal contractional deformation zone and the backlimb strike-slip zone.



中文翻译:

塔里木盆地巴楚隆起沿土木休克逆冲的厚皮形变变化

弯曲的图姆休克推力是塔里木盆地巴楚隆起的东北边界。基于对2D地震反射剖面的解释,沿Tumuxiuke结构带的厚皮形变的特征是与俯冲结构交替的单斜断层传播褶皱。厚皮变形的定位和模式是由预先存在的正常断层控制的。向前的三剪切建模过程进一步揭示了从先前存在的正断层分支出来的短切冲的存在,并测试了它们对褶皱变形的影响。由于预先存在的正常断层段的选择性反转,被低角度短切冲断层斩首的单斜线与被高角度倒断层斩首的斜线共存。此外,断层传播与断层滑移率(P / S)以及多次传播推力的综合作用决定了褶皱放大率和生长层构造的变化。昆仑山西部造山带的新生代活动和新生代土木休克逆冲运动表明造山过程中的应力是远场传播到前陆的。在大约N–S方向的压缩应力下,近WE冲击段中的倒置结构表现出由前驱力控制的单斜断层传播褶皱;对于NW-SE斜向倾斜段,将压变形分为前收缩变形区和后肢走滑区。

更新日期:2021-01-10
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