DOI: 10.1016/j.epsl.2020.116196
论文题名: Glacial erosion promotes high mountains on thin crust
作者: Robl J. ; Hergarten S. ; Prasicek G.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 538 语种: 英语
中文关键词: crustal thickness
; flexural isostasy
; glacial erosion
; mountain peaks
; quaternary climate cooling
; topographic load
英文关键词: Earth (planet)
; Erosion
; Geodesy
; Geometry
; Glacial geology
; Structural geology
; Crustal thickness
; flexural isostasy
; Glacial erosion
; Mountain peaks
; Quaternary climate
; Landforms
; cooling
; crustal thickening
; crustal thickness
; flexure
; glacial erosion
; glacial landform
; isostasy
; mountain region
; paleoclimate
; Quaternary
; tectonic evolution
英文摘要: Every mountain range on Earth is unique in its tectonic evolution, but Quaternary climate cooling resulted in alpine landscapes with globally similar landforms such as horn-shaped peaks, cirques and overdeepened valleys. On a global scale, the impact of glacial and periglacial processes on the geometry of mountain ranges and the relative efficiency of glacial and fluvial erosion are still discussed. To address these issues, we analyse a novel, worldwide dataset of more than 16,000 mountain peaks. We relate peak height and steepness to mean elevation and crustal thickness. We show that the geometry of mountain ranges systematically varies with latitude and thus with climate. For peaks of similar height, the steepness increases towards high latitudes, while mean elevation and thickness of the supporting crust decrease. Modelling flexural isostasy based on the topographic load of mountain ranges demonstrates that the crustal thickness required to support peaks of similar height dramatically declines with intensity of glacial erosion. In concert with latitudinal trends in peak steepness, mean elevation and crustal thickness, this shows that Quaternary climate cooling reduces the topographic load by transforming the geometry of mountain landscapes from fluvial to glacial conditions. We conclude that the prevalence of glacial erosion in cold climate reduces the topographic load of mountain ranges and enables the growth of high mountain peaks even on moderately over-thickened crust. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165242
Appears in Collections: 气候变化与战略
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作者单位: Department of Geography and Geology, University of Salzburg, Salzburg, Austria; Institute of Earth and Environmental Sciences - Geology, University of Freiburg, Freiburg, Germany; Department of Earth Surface Dynamics, University of Lausanne, Lausanne, Switzerland
Recommended Citation:
Robl J.,Hergarten S.,Prasicek G.. Glacial erosion promotes high mountains on thin crust[J]. Earth and Planetary Science Letters,2020-01-01,538