Arid
DOI10.1016/j.geomorph.2010.07.003
Cracks in desert pavement rocks: Further insights into mechanical weathering by directional insolation
Eppes, Martha Cary1; McFadden, Leslie D.2; Wegmann, Karl W.3; Scuderi, Louis A.2
通讯作者Eppes, Martha Cary
来源期刊GEOMORPHOLOGY
ISSN0169-555X
EISSN1872-695X
出版年2010
卷号123期号:1-2页码:97-108
英文摘要

The formation of cracks is a fundamental first step in the physical weathering of rocks in desert environments. In this study we combine new field data from the Mojave (U.S.), Gobi (Mongolia) and Strzelecki (Australia) deserts that collectively support the hypothesis that meridional cracks (cracks with orientations not readily attributable to rock anisotropies or shape) in boulders or cobbles form due to tensile stresses caused by directional heating and cooling during the sun’s daily transit. The new studies indicate that rock size, surface age, and latitude play important roles with respect to their influence on rock fracture. Rock size and pavement surface age exert an influence on the development of rock cracks as the average clast size of mature desert pavements may be at or below the threshold-clast size for thermal cracking of rocks. Latitude-controlled seasonal temperature variations play a key role, as demonstrated by: 1) tightly clustered mean resultant orientations that differ by latitude, as predicted in McFadden et al. (2005), and 2) very cold wintertime temperatures and strong diurnal gradients that may favor crack development in wintertime, given the likelihood for strong clast heating during early morning hours. The consistent evidence for meridional cracks in surfaces of diverse age and desert environments, climate, vegetation, and distance of clast transport indicate that directional insolation may play the key role in initially generating and propagating rock fractures, rather than a secondary role as implied in recent field and modeling studies of physical weathering in deserts. (C) 2010 Elsevier B.V. All rights reserved.


英文关键词Desert pavements Physical weathering Desert geomorphology Insolation weathering Fractures
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000282732600008
WOS关键词ALLUVIAL-FAN SURFACES ; EASTERN MOJAVE DESERT ; CENTRAL NAMIB DESERT ; CIMA VOLCANIC FIELD ; PEDOGENIC PROCESSES ; CALIFORNIA ; EVOLUTION ; SOILS ; SIMULATIONS ; BREAKDOWN
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/164347
作者单位1.Univ N Carolina, Dept Geog & Earth Sci, Charlotte, NC 28223 USA;
2.Univ New Mexico, Dept Earth & Planetary Sci, Albuquerque, NM 87131 USA;
3.N Carolina State Univ, Dept Marine Earth & Atmospher Sci, Raleigh, NC 27695 USA
推荐引用方式
GB/T 7714
Eppes, Martha Cary,McFadden, Leslie D.,Wegmann, Karl W.,et al. Cracks in desert pavement rocks: Further insights into mechanical weathering by directional insolation[J],2010,123(1-2):97-108.
APA Eppes, Martha Cary,McFadden, Leslie D.,Wegmann, Karl W.,&Scuderi, Louis A..(2010).Cracks in desert pavement rocks: Further insights into mechanical weathering by directional insolation.GEOMORPHOLOGY,123(1-2),97-108.
MLA Eppes, Martha Cary,et al."Cracks in desert pavement rocks: Further insights into mechanical weathering by directional insolation".GEOMORPHOLOGY 123.1-2(2010):97-108.
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