Landforms and landscape evolution in the Skardu,Shigar and Braldu Valleys,Central Karakoram |
| |
| Authors: | Yeong Bae Seong Michael P Bishop Andrew Bush Penny Clendon Luke Copland Robert C Finkel Ulrich Kamp Lewis A Owen John F Shroder |
| |
| Institution: | 1. Department of Geology, University of Cincinnati, P.O. Box 0013, Cincinnati, OH 45221-0013, U.S.A.;2. Department of Geography and Geology, University of Nebraska – Omaha, 6001 Dodge Street, Omaha, NE 68182-0199, U.S.A.;3. Department of Earth and Atmospheric Sciences, University of Alberta, 1-26 Earth Sciences Building, Edmonton, Alberta, Canada T6G 2E3;4. Department of Geography, University of Canterbury, Private Bag 4800 Christchurch, New Zealand;5. Department of Geography, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5;6. Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA;7. Department of Geography, The University of Montana, SS 204, Missoula, MT 59812-5040, U.S.A. |
| |
| Abstract: | The Central Karakoram, which includes K2 in Pakistan, is one of the most rapidly rising areas on Earth and exhibits complex topography and extreme relief. Impressive valley fills and glacial landforms are present throughout the valleys. The dynamics of landscape evolution of the region are currently not well understood. Consequently, the landforms were mapped and assessed in the Skardu, Shigar, and Braldu valleys, to elucidate the spatio-temporal scale dependencies of surface processes active in the region. These valleys were examined using geomorphic field methods, remote sensing, geomorphometry, and terrestrial cosmogenic nuclides (TCNs) surface exposure dating. The glaciers in this region have oscillated considerably throughout the Late Quaternary, and four glacial stages have been recognized including at least six glacial advances. Surface processes readjusted after glacier retreat, and ubiquitous mass movements and catastrophic landsliding transported material from steep slopes to valley bottoms, while glaciofluvial meltwater and glacier outburst floods redistributed sediment down valley. Glacier geochronology and late Holocene ages of the outburst flood deposits indicate that landscape evolution has been dominated by glaciation and paraglaciation during the late Quaternary. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
