博乐盆地晚更新世断层滑动率:洞察中天山的变形运动学

IF 2.7 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Zongkai Hu, Xiaoping Yang, An Li, Haibo Yang
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引用次数: 0

摘要

天山是一个面积广阔、地震活动频繁的大陆内部山脉。全球定位系统测量和野外研究表明,天山中部分布着东西走向和西北-东南走向的推断岩和与断层有关的褶皱。然而,很少有研究确定天山中部最北端的博乐盆地的断层和断层相关褶皱活动。在本研究中,我们重点研究了位于博乐盆地南缘的阿拉山口褶皱。通过使用高分辨率无人驾驶航空飞行器-数字高程模型数据、实地观测和详细测绘,我们确定阿拉沙克褶皱的特征是三剪切断层-褶皱。我们在阿拉沙克河沿岸发现了五层河流表面,T3 阶地在整个褶皱中连续保存。我们使用放射性碳和表层 10Be 测定法确定了 T3 变形阶地的出露年代。T3 的褶皱特征、三剪切倒置模型和废弃年代表明,自晚更新世以来,阿拉沙克断层的隆起速率分别为 0.8 ± 0.3 毫米/年、倾滑速率为 4.2 ± 1.2 毫米/年、地壳缩短速率为 4.0 ± 1.2 毫米/年。Alashak 断层和 Latgan 断层在 1.2 千米深处相交,围成一个楔形地块。我们的研究强调,博乐盆地南缘的构造活动在天山中部南北向缩短过程中发挥了重要作用,这是自更新世晚期以来的地质测量结果。阿拉山口断层有可能引发中强地震(Mw 5.0-7.0),而阿拉山口和拉特干断层则可能引发大地震(Mw 7.2)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Late Pleistocene Fault Slip Rate within the Bole Basin: Insights into deformation kinematics in the Central Tian Shan

Tian Shan is a vast and highly seismically active intracontinental mountain range. GPS measurements and field studies have shown that E-W and NW-SE trending thrusts and fault-related folds are distributed across central Tian Shan. However, few studies have determined the fault and fault-related-fold activity in the Bole Basin, the northernmost part of central Tian Shan. In this study, we focus on the Alashak Fold, which is situated along the southern margin of the Bole Basin. Using high-resolution uncrewed aerial vehicle-Digital Elevation Model data, field observations, and detailed mapping, we determined that the Alashak Fold is characterized by a trishear fault-propagation fold. Along the Alashak River, we identified five levels of fluvial surfaces, the T3 terrace was continuously preserved across the fold. Radiocarbon and surficial 10Be dating were used to determine the exposure age of the deformed T3 terrace. The folding characteristics of T3, trishear inversed modeling, and abandonment age indicate that the Alashak Fault has an uplift rate of 0.8 ± 0.3 mm/yr, a dip-slip rate of 4.2 ± 1.2 mm/yr, and a crustal shortening rate of 4.0 ± 1.2 mm/yr since the late Pleistocene, respectively. The Alashak and Latgan Faults intersect at a depth of 1.2 km, enclosing a wedge-shaped block. Our study emphasizes that tectonic activity along the southern margin of the Bole Basin has played a significant role in north-south shortening within central Tian Shan, as measured by geological measurements since the late Pleistocene. The Alashak Fault can potentially generate moderate–strong (Mw 5.0–7.0) earthquakes, while the Alashak and Latgan Faults can generate major (Mw 7.2) earthquakes.

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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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