Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B31435.1 |
Squeezing river catchments through tectonics: Shortening and erosion across the Indus Valley, NW Himalaya | |
Sinclair, H. D.1; Mudd, S. M.1; Dingle, E.1; Hobley, D. E. J.2; Robinson, R.3; Walcott, R.1,4 | |
2017 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
![]() |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2017 |
卷号 | 129 |
文章类型 | Article |
语种 | 英语 |
国家 | Scotland; USA |
英文摘要 | Tectonic displacement of drainage divides and the consequent deformation of river networks during crustal shortening have been proposed for a number of mountain ranges, but never tested. In order to preserve crustal strain in surface topography, surface displacements across thrust faults must be retained without being recovered by consequent erosion. Quantification of these competing processes and the implications for catchment topography have not previously been demonstrated. Here, we use structural mapping combined with dating of terrace sediments to measure Quaternary shortening across the Indus River valley in Ladakh, NW Himalaya. We demonstrate similar to 0.21 m k.y.(-1) of horizontal displacement since ca. 45 ka on the Stok thrust in Ladakh, which defines the southwestern margin of the Indus Valley catchment and is the major back thrust to the Tethyan Himalaya in this region. We use normalized river channel gradients of the tributaries that drain into the Indus River to show that the lateral continuation of the Stok thrust was active for at least 70 km along strike. Shortening rates combined with fault geometries yield vertical displacement rates that are compared to time-equivalent erosion rates in the hanging wall derived from published detrital Be-10 analyses. The results demonstrate that vertical displacement rates across the Stok thrust were approximately twice that of the time-equivalent erosion rates, implying a net horizontal displacement of the surface topography, and hence narrowing of the Indus Valley at similar to 0.1 m k.y.(-1). A fill terrace records debris-flow emplacement linked to thrust activity, resulting in damming of the valley and extensive lake development. Conglomerates beneath some of the modern alluvial fans indicate a northeastward shift of the Indus River channel since ca. 45 ka to its present course against the opposite side of the valley from the Stok thrust. The integration of structural, topographic, erosional, and sedimentological data provides the first demonstration of the tectonic convergence of drainage divides in a mountain range and yields a model of the surface processes involved. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000390988400013 |
WOS关键词 | TIBETAN PLATEAU MARGIN ; LADAKH BATHOLITH ; STREAM POWER ; DENUDATION RATES ; NORTHERN INDIA ; LONGITUDINAL PROFILES ; THRESHOLD HILLSLOPES ; STRUCTURAL EVOLUTION ; ACTIVE TECTONICS ; FLUVIAL RESPONSE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/24762 |
专题 | 地球科学 |
作者单位 | 1.Univ Edinburgh, Sch Geosci, Drummond St, Edinburgh EH8 9XP, Midlothian, Scotland; 2.Univ Colorado, Dept Geol Sci, CIRES, UCB 399,2200 Colorado Ave, Boulder, CO 80309 USA; 3.Univ St Andrews, Dept Earth Sci & Environm Sci, Irvine Bldg, St Andrews KY16 9AL, Fife, Scotland; 4.Natl Museums Scotland, Dept Nat Sci, Chambers St, Edinburgh EH1 1JF, Midlothian, Scotland |
推荐引用方式 GB/T 7714 | Sinclair, H. D.,Mudd, S. M.,Dingle, E.,et al. Squeezing river catchments through tectonics: Shortening and erosion across the Indus Valley, NW Himalaya[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2017,129. |
APA | Sinclair, H. D.,Mudd, S. M.,Dingle, E.,Hobley, D. E. J.,Robinson, R.,&Walcott, R..(2017).Squeezing river catchments through tectonics: Shortening and erosion across the Indus Valley, NW Himalaya.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,129. |
MLA | Sinclair, H. D.,et al."Squeezing river catchments through tectonics: Shortening and erosion across the Indus Valley, NW Himalaya".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 129(2017). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论