DOI: 10.1016/j.earscirev.2019.102925
论文题名: Weathering fronts
作者: Phillips J.D. ; Pawlik Ł. ; Šamonil P.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2019
卷: 198 语种: 英语
中文关键词: Critical zone
; Hillslope processes
; Multidirectional mass fluxes
; Regolith
; Soil evolution
; Weathering profile
英文关键词: denudation
; hillslope
; landscape evolution
; lithology
; mass movement
; mass transport
; regolith
; weathering profile
英文摘要: A distinct boundary between unweathered and weathered rock that moves downward as weathering proceeds—the weathering front—is explicitly or implicitly part of landscape evolution concepts of etchplanation, triple planation, dynamic denudation, and weathering- and supply-limited landscapes. Weathering fronts also figure prominently in many models of soil, hillslope, and landscape evolution, and mass movements. Clear transitions from weathered to unweathered material, increasing alteration from underlying bedrock to the surface, and lateral continuity of weathering fronts are ideal or benchmark conditions. Weathered to unweathered transitions are often gradual, and weathering fronts may be geometrically complex. Some weathering profiles contain pockets of unweathered rock, and highly modified and unmodified parent material at similar depths in close proximity. They also reflect mass fluxes that are more varied than downward-percolating water and slope-parallel surface processes. Fluxes may also be upward, or lateral along lithological boundaries, structural features, and textural or weathering-related boundaries. Fluxes associated with roots, root channels, and faunal burrows may potentially occur in any direction. Just as pedology has broadened its traditional emphasis on top-down processes to incorporate various lateral fluxes, studies of weathering profiles are increasingly recognizing and incorporating multidirectional mass fluxes. Examples from karst systems may also be useful, where concepts of laterally continuous weathering fronts, rock-regolith boundaries, and water tables; and an assumption of dominantly diffuse downward percolation are generally inapplicable. We also question the idea of a single weathering front, and of a two-stage process of weathering rock to regolith, and transforming regolith to soil. In many cases there appears to be three stages involving conversion of bedrock to weathered rock, weathered rock to regolith, and regolith to soil. © 2019 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165909
Appears in Collections: 气候变化与战略
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作者单位: Earth Surface Systems Program, Department of Geography, University of Kentucky, Lexington, KY 40508, United States; Faculty of Earth Sciences, University of Silesia, ul. Będzińska 60, Sosnowiec, 41-200, Poland; The Silva Tarouca Research Institute, Department of Forest Ecology, Lidická 25/27, Brno, 602 00, Czech Republic
Recommended Citation:
Phillips J.D.,Pawlik Ł.,Šamonil P.. Weathering fronts[J]. Earth Science Reviews,2019-01-01,198