Restraining bend deformation at the northern termination of the Wadi Araba Fault: Insights from reflection seismic data and focal mechanism solutions

IF 2.7 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Tectonophysics Pub Date : 2024-08-08 DOI:10.1016/j.tecto.2024.230456
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Abstract

This study examines subsurface deformation at the northern end of the Wadi Araba Fault (WAF), focusing on the Amman-Hallabat Fault (AHF) and the Wadi Shueib Fault (WSF). While surface evidence shows their tectonic impact from the Late Cretaceous to the present, research on their subsurface structures, contributing to the WAF, is limited. Using seismic data and well report, five seismo-stratigraphic units with significant unconformities were identified. The seismo-structural interpretation reveals a complex deformational fault zone with numerous reverse and normal faults intersecting strata from post-Precambrian rocks to the uppermost Cretaceous deposits, forming a composite flower structure with positive and negative flower characteristics. These structures show significant folding and thrusting of deposits from the uppermost Cretaceous to recent times. Seismic evidence indicates that the AHF and WSF extend upward to the Earth's surface. Fault mechanism analysis suggests a NE-SW transpressional deformation pattern, with fault formation and associated structures influenced by the Syrian Arc stress field since the Turonian. Changes in stress field orientation have significantly affected their reactivation. At its northern termination, the WAF may intersect or terminate against pre-existing faults like the AHF and WSF, influencing the WAF's behavior by accommodating strain, dissipating energy, or being reactivated as restraining bends due to the NNW-SSE-trending Dead Sea stress, leading to a complex network of distributed movement.

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瓦迪阿拉巴断层北端的限制性弯曲变形:反射地震数据和焦点机制解决方案的启示
本研究探讨了 Wadi Araba 断层(WAF)北端的地下变形,重点是安曼-哈拉巴特断层(AHF)和 Wadi Shueib 断层(WSF)。虽然地表证据显示了它们从晚白垩世至今的构造影响,但对造成 WAF 的地下结构的研究却很有限。利用地震数据和油井报告,确定了五个具有明显不整合的地震地层单元。地震构造解释揭示了一个复杂的变形断层带,其中有许多逆断层和正断层,与从后寒武纪岩石到最上层白垩纪沉积物的地层相交,形成了具有正反花特征的复合花构造。这些构造显示,从最上白垩纪到近代的沉积物都发生了明显的褶皱和推移。地震证据表明,AHF 和 WSF 向上延伸至地球表面。断层机制分析表明,自都伦纪以来,断层的形成和相关结构受到叙利亚弧应力场的影响,形成了东北-西南转位变形模式。应力场方向的变化极大地影响了它们的重新激活。在其北端,WAF 可能与 AHF 和 WSF 等原有断层相交或终止,通过容纳应变、消散能量或因 NNW-SSE 走向的死海应力而重新激活为约束性弯曲,从而影响 WAF 的行为,导致复杂的分布运动网络。
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来源期刊
Tectonophysics
Tectonophysics 地学-地球化学与地球物理
CiteScore
4.90
自引率
6.90%
发文量
300
审稿时长
6 months
期刊介绍: The prime focus of Tectonophysics will be high-impact original research and reviews in the fields of kinematics, structure, composition, and dynamics of the solid arth at all scales. Tectonophysics particularly encourages submission of papers based on the integration of a multitude of geophysical, geological, geochemical, geodynamic, and geotectonic methods
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