DOI: 10.1002/2017JE005465
Scopus记录号: 2-s2.0-85041512005
论文题名: Dune-Yardang Interactions in Becquerel Crater, Mars
作者: Urso A. ; Chojnacki M. ; Vaz D.A.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 2 起始页码: 353
结束页码: 368
语种: 英语
英文关键词: Becquerel crater
; dunes
; landscape evolution
; Mars
; yardangs
Scopus关键词: crater
; dune formation
; eolian process
; landscape evolution
; Mars
; sediment transport
英文摘要: Isolated landscapes largely shaped by aeolian processes can occur on Earth, while the majority of Mars' recent history has been dominated by wind-driven activity. Resultantly, Martian landscapes often exhibit large-scale aeolian features, including yardang landforms carved from sedimentary-layered deposits. High-resolution orbital monitoring has revealed that persistent bedform activity is occurring with dune and ripple migration implying ongoing abrasion of the surface. However, little is known about the interaction between dunes and the topography surrounding them. Here we explore dune-yardang interactions in Becquerel crater in an effort to better understand local landscape evolution. Dunes there occur on the north and south sides of a 700 m tall sedimentary deposit, which displays numerous superposed yardangs. Dune and yardang orientations are congruent, suggesting that they both were formed under a predominantly northerly wind regime. Migration rates and sediment fluxes decrease as dunes approach the deposit and begin to increase again downwind of the deposit where the effect of topographic sheltering decreases. Estimated sand abrasion rates (16–40 μm yr−1) would yield a formation time of 1.8–4.5 Myr for the 70 m deep yardangs. This evidence for local aeolian abrasion also helps explain the young exposure ages of deposit surfaces, as estimated by the crater size-frequency distribution. Comparisons to terrestrial dune activity and yardang development begin to place constraints on yardang formation times for both Earth and Mars. These results provide insight into the complexities of sediment transport on uneven terrain and are compelling examples of contemporary aeolian-driven landscape evolution on Mars. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114558
Appears in Collections: 气候减缓与适应
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作者单位: Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, United States; INAF, Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Teramo, Teramo, Italy; Centre for Earth and Space Research of the University of Coimbra, Observatório Geofísico e Astronómico da Universidade de Coimbra, Coimbra, Portugal
Recommended Citation:
Urso A.,Chojnacki M.,Vaz D.A.. Dune-Yardang Interactions in Becquerel Crater, Mars[J]. Journal of Geophysical Research: Planets,2018-01-01,123(2)