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Late Quaternary tectono-geomorphic forcing vis-a-vis topographic evolution of Indus catchment, Ladakh, India
Catena ( IF 6.2 ) Pub Date : 2020-12-28 , DOI: 10.1016/j.catena.2020.105103
Debarati Nag , Binita Phartiyal , Mallickarjun Joshi

The Indus River valley has frequently reorganized itself to attain geomorphic equilibrium during the Late Quaternary. In this regard, significant advances have been made towards the understanding of the response of landform/ landscape to climate (exogenic) forcings. However, advancements in geomorphic studies on the upper Indus basin focusing on recent tectonics (endogenic) are lacking, thus implementing a partial picture of landscape evolution. This article attempts to synthesize geomorphic indices of active tectonics to understand the prevalence of neotectonic activity in the Ladakh area. A combination of geomorphic field data, morphometric analysis and previously published incision rates, denudation rates, the chronology of landform features and soft-sediment deformation structures are used to suggest the region is undergoing differential tectonic activity. Based on morphometric parameters and landform characteristics, the region is divided into three differentially uplifted morphotectonic segments. The neotectonic activity is inferred to be the response to the thrusting of Indus Molasse over the rigid Ladakh Batholith along with oblique convergence of the Indian plate in the study area. This led to the development of a system of back thrust (Stok Thrust) and cross-cutting minor strike-slip faults. Recurrent tectonic activity largely responding to the differential movement along this system of thrust fault is recorded at 50 ka, 35 ka and 21 ka (Last Glacial Maxima) through lower Greenlandian (~11 ka) to middle Northgrippian (~6 ka), while the climatically induced topographic changes are marked between ~13 and 12 ka.



中文翻译:

晚第四纪构造,地貌迫使面对面的人梧桐流域的地貌演化,印度拉达克

在第四纪晚期,印度河流域经常进行自我重组以达到地貌平衡。在这方面,在了解地貌/地貌对气候(外生)强迫的响应方面已取得重大进展。然而,缺乏对印度河上游盆地地貌研究的关注,该研究集中在近来的构造(内生)上,因此对景观演化有了部分了解。本文试图合成活跃构造的地貌指标,以了解拉达克地区新构造活动的普遍性。结合了地貌数据,形态分析和先前发布的切口率,剥蚀率,地貌特征和软沉积物变形结构的年代顺序表明该地区正在经历差异构造​​活动。根据形态参数和地形特征,将该区域分为三个差异性隆起的构造构造段。推断新构造活动是对印度洋莫拉斯(Indus Molasse)在刚性拉达克岩基上的推挤以及印度板块在该研究区的倾斜汇聚的响应。这导致了反推力(Stok Thrust)和横切的小走滑断层系统的发展。沿这种逆冲断层系统的主要构造活动的反复构造活动记录为:从低格陵兰时代(〜11ka)到中北部格里风山脉(〜6ka)的50ka,35ka和21ka(上冰川末期),

更新日期:2020-12-28
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