DOI: 10.1038/ngeo2600
论文题名: Chemical weathering in active mountain belts controlled by stochastic bedrock landsliding
作者: Emberson R. ; Hovius N. ; Galy A. ; Marc O.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 1 起始页码: 42
结束页码: 45
语种: 英语
Scopus关键词: bedrock
; catchment
; chemical weathering
; erosion rate
; extreme event
; landslide
; mass wasting
; mountain region
; precipitation (climatology)
; runoff
; seismicity
; stochasticity
; weathering rate
; New Zealand
; South Island
; Southern Alps
英文摘要: A link between chemical weathering and physical erosion exists at the catchment scale over a wide range of erosion rates. However, in mountain environments, where erosion rates are highest, weathering may be kinetically limited and therefore decoupled from erosion. In active mountain belts, erosion is driven by bedrock landsliding at rates that depend strongly on the occurrence of extreme rainfall or seismicity. Although landslides affect only a small proportion of the landscape, bedrock landsliding can promote the collection and slow percolation of surface runoff in highly fragmented rock debris and create favourable conditions for weathering. Here we show from analysis of surface water chemistry in the Southern Alps of New Zealand that weathering in bedrock landslides controls the variability in solute load of these mountain rivers. We find that systematic patterns in surface water chemistry are strongly associated with landslide occurrence at scales from a single hillslope to an entire mountain belt, and that landslides boost weathering rates and river solute loads over decades. We conclude that landslides couple erosion and weathering in fast-eroding uplands and, thus, mountain weathering is a stochastic process that is sensitive to climatic and tectonic controls on mass wasting processes. © 2015 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106093
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: GFZ Deutsches, GeoForschungZentrum, Potsdam, Germany; Institute of Earth and Environmental Science, University of Potsdam, Potsdam, Germany; CRPG-CNRS-UL, Nancy, France
Recommended Citation:
Emberson R.,Hovius N.,Galy A.,et al. Chemical weathering in active mountain belts controlled by stochastic bedrock landsliding[J]. Nature Geoscience,2016-01-01,9(1)