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Effect of moisture and temperature conditions on the decay rate of a purple mudstone in southwestern China
Zhang, Dan1; Chen, Anqiang2; Xiong, Donghong3; Liu, Gangcai3
Corresponding AuthorLiu, GC(刘刚才)
2013
Source PublicationGEOMORPHOLOGY
ISSN0169-555X
EISSN1872-695X
Volume182Pages:125-132
SubtypeArticle
AbstractSoil formation and geomorphology are primarily influenced by the rock decay, which in turn is strongly determined by moisture and temperature conditions. However, it remains unclear whether rock decay is dominated by thermal stresses or by hydration disintegration, and there is little information on mudstone decay rate in southwestern China. This study hypothesized that rock decay is dominated by hydration mechanism, and focused on the physical decay characteristics of typical purple mudstones using a combination of field and laboratory-based experiments. The bedrock of a Penglaizhen group (J(3)p) in Yanting County, Sichuan Province, southwestern China, was exposed and covered with nylon fabric in situ. Soil depths of 10, 20, 40 and 60 cm were laid on this nylon fabric in 2003, and the decay rate (the quantity of clastic particles <2 mm that were decayed from the bedrock, in t km(-2) yr(-1)) under the nylon fabric was measured both in 2005 and 2009. In addition, fresh mudstones sampled from the Matoushan group (K(2)m), the Tuodian group (J(3)t) and the Lufeng group (J(1)l) in Yuanmou County, Shuangbai County, and Lufeng County of Yunnan Province, southwestern China, respectively, were subjected to alternating applications of moisture, temperature and their interaction (seven treatments) in the laboratory, and their decay ratios (the mass of decayed rock of <2 mm clastic particles to sampled rock mass, in percent) were measured in 2010. In the field, the decay rate of the bedrock showed a significant (p<0.05) positive relationship with both the daily moisture and temperature variation at the interface between the soil and bedrock. In the laboratory, results showed that the effect of moisture variation, but not temperature alternation, on rock decay was apparent, suggesting that purple rock decay is dominated by hydration mechanism. Freezing-thawing in particular affects the sampled rocks, because it causes more spalling and fracturing. The J(3)t rock had the highest decay ratio because it had the highest clay mineral content and porosity of the three rock types. Hierarchical clustering analysis suggested that the variation of moisture content and H2O phase (solid or liquid) within rock plays a key role in rock decay processes. Both field and laboratory studies consistently showed that the alteration of wetting-drying and freezing-thawing, as well as moisture content, substantially influenced rock decay. (C) 2012 Elsevier B.V. All rights reserved.
KeywordRock Decay Mudstone Moisture And Temperature Interaction Moisture Alternation Temperature Alternation Freeze-thaw
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.geomorph.2012.11.003
WOS Subject ExtendedPhysical Geography ; Geology
Indexed BySCI
WOS KeywordCLIMATE-CHANGE ; ROCK ; CLAY ; ANTARCTICA ; HILLSLOPE ; RELEASE ; CANADA ; SPAIN
Language英语
Quartile2区
TOP
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary
WOS IDWOS:000314328800010
Funding OrganizationNational Natural Science Foundation Committee of China(40971168) ; One Hundred Young Persons Project of the Institute of Mountain Hazards and Environment Chinese Academy of Sciences(SDSQB-2011-01)
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Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/5460
Collection山地灾害与地表过程重点实验室
山地表生过程与生态调控重点实验室
Affiliation1.Yunnan Agr Univ, Coll Resources & Environm, Kunming 650205, Peoples R China
2.Yunnan Acad Agr Sci, Inst Agr Environm & Resources, Kunming 650205, Peoples R China
3.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Dan,Chen, Anqiang,Xiong, Donghong,et al. Effect of moisture and temperature conditions on the decay rate of a purple mudstone in southwestern China[J]. GEOMORPHOLOGY,2013,182:125-132.
APA Zhang, Dan,Chen, Anqiang,Xiong, Donghong,&Liu, Gangcai.(2013).Effect of moisture and temperature conditions on the decay rate of a purple mudstone in southwestern China.GEOMORPHOLOGY,182,125-132.
MLA Zhang, Dan,et al."Effect of moisture and temperature conditions on the decay rate of a purple mudstone in southwestern China".GEOMORPHOLOGY 182(2013):125-132.
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