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Late Miocene accelerated exhumation in the central Tajik Basin and implications for northward indention and lateral growth of the Pamir
Tectonophysics ( IF 2.9 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.tecto.2020.228438
Lixing Lü , Jimin Sun , Zhiliang Zhang , Yingying Jia , Shengchen Tian , Sherzod Abdulov , Mustafo Gadoev , Ilhomjon Oimahmadov

Abstract The Tajik Basin, located at the west of the Pamir, is characterized by a series of thin-skinned folds and thrusts within its interior. Constraining the onset of deformation of these structures is important both for illustrating basin inversion process and for understanding growth history of the adjacent Pamir. To date, the timing of thrusting and folding within the Tajik Basin has not been well studied. In this study, we determined the timing of fault motion of the Aruntau thrust in the central Tajik Basin by using apatite (U Th)/He thermochronometry. Apatite (U Th)/He age data of sandstone samples collected from the hanging wall of the Aruntau thrust fault, combined with thermal history simulation, constrains the onset of rapid cooling of rock samples at ca. 10–6 Ma. Given the compressional tectonic regime, we propose that the observed rapid cooling was caused by thrust-induced exhumation, and thus, the cooling age of ~10–6 Ma approximately represents the timing of thrusting initiation. Integrated with previous studies, we found that the late Miocene tectonic deformation was not only circumscribed within the Tajik Basin, but also occurred in the areas north and east of the Pamir and within the Pamir. We suggest that the synchronously widespread tectonic deformation in the Pamir-Tian Shan convergence zone reflects the enhanced northward indentation and lateral growth of the Pamir since the late Miocene.

中文翻译:

中新世晚期塔吉克盆地中部的加速剥露以及对帕米尔高原向北凹陷和横向生长的影响

摘要 塔吉克盆地位于帕米尔高原西部,其内部具有一系列薄皮褶皱和逆冲断层。限制这些结构的变形开始对于说明盆地反转过程和了解相邻帕米尔的生长历史都很重要。迄今为止,塔吉克盆地内冲断和折叠的时间尚未得到很好的研究。在这项研究中,我们使用磷灰石 (U Th)/He 热计时法确定了塔吉克盆地中部 Aruntau 逆冲断层运动的时间。从 Aruntau 逆冲断层的上盘收集的砂岩样品的磷灰石 (U Th)/He 年龄数据,结合热历史模拟,限制了大约 10 小时岩石样品快速冷却的开始。10–6 马。鉴于挤压构造体制,我们提出观察到的快速冷却是由推力引起的折返引起的,因此,~10-6 Ma 的冷却年龄大约代表了推力开始的时间。结合前人研究,我们发现晚中新世构造变形不仅局限在塔吉克盆地内部,还发生在帕米尔高原以北、以东和帕米尔高原内部。我们认为,帕米尔-天山辐合带同步广泛的构造变形反映了帕米尔自晚中新世以来向北凹陷和横向生长的增强。我们发现晚中新世构造变形不仅局限在塔吉克盆地内部,而且还发生在帕米尔高原以北和以东地区以及帕米尔高原内部。我们认为,帕米尔-天山辐合带同步广泛的构造变形反映了帕米尔自晚中新世以来向北凹陷和横向生长的增强。我们发现晚中新世构造变形不仅局限在塔吉克盆地内部,而且还发生在帕米尔高原以北、以东和帕米尔高原内部。我们认为,帕米尔-天山辐合带同步广泛的构造变形反映了帕米尔自晚中新世以来向北凹陷和横向生长的增强。
更新日期:2020-07-01
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