Interaction between basement inherited strike-slip structures and thrust wedge propagation in the northern Tianshan foreland basin: Insight from analogue modelling experiments

IF 2.6 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Zhenyu Peng , Fabien Graveleau , Bruno C. Vendeville , Xin Wang , Olivier Averbuch
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引用次数: 0

Abstract

Basement inherited structures represent a significant factor affecting thrust propagation dynamics during the growth of fold-and-thrust belts. In this study inspirited from seismic data analysis of Gaoquan anticline in the Northern Tianshan foreland basin, we devised an experimental approach to investigate the structural and kinematical evolution of deformation from preexisting basement restraining bend to subsequent contractional deformation. Tested parameters included reactivation of the basement restraining bend and erosion. Results indicated that when preexisting basement restraining bend was reactivated and folded an overlying décollement, subsequent thrust nucleated preferentially at the top of the folded décollement. Erosion helped localize deformation, thereby reducing the width of the deformation zone and promoting “out-of-sequence” thrusting during compression. Finally, as we employed silicone polymer to simulate overpressured mudstone layer in the major décollement, our experiments also provide insights into a better understanding of the relationship between shallow salt-detached thrusting and deep inherited basement structures, such as in the Jura Mountains structures.

天山前陆盆地北部基底继承性走向滑动构造与推力楔传播之间的相互作用:模拟实验的启示
在褶皱推覆带的生长过程中,基底继承构造是影响推覆传播动力学的重要因素。本研究从北天山前陆盆地高泉反斜的地震资料分析中得到启发,设计了一种实验方法来研究从原有基底约束弯曲到后续收缩变形的结构和运动学演化过程。试验参数包括重新激活基底约束弯曲和侵蚀。结果表明,当预先存在的基底约束弯曲被重新激活并褶皱上覆地层时,随后的推力优先在褶皱地层顶部成核。侵蚀有助于使变形局部化,从而减少变形区的宽度,并促进压缩过程中的 "失序 "推力。最后,由于我们采用硅聚合物来模拟主要褶皱中的过压泥岩层,我们的实验也为更好地理解浅层盐析推力与深层继承基底结构(如汝拉山结构)之间的关系提供了启示。
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来源期刊
Journal of Structural Geology
Journal of Structural Geology 地学-地球科学综合
CiteScore
6.00
自引率
19.40%
发文量
192
审稿时长
15.7 weeks
期刊介绍: The Journal of Structural Geology publishes process-oriented investigations about structural geology using appropriate combinations of analog and digital field data, seismic reflection data, satellite-derived data, geometric analysis, kinematic analysis, laboratory experiments, computer visualizations, and analogue or numerical modelling on all scales. Contributions are encouraged to draw perspectives from rheology, rock mechanics, geophysics,metamorphism, sedimentology, petroleum geology, economic geology, geodynamics, planetary geology, tectonics and neotectonics to provide a more powerful understanding of deformation processes and systems. Given the visual nature of the discipline, supplementary materials that portray the data and analysis in 3-D or quasi 3-D manners, including the use of videos, and/or graphical abstracts can significantly strengthen the impact of contributions.
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