Impacts of simulated acid solution on the disintegration and cation release of purple rock (mudstone) in Southwest China
Jixia Zhao1,2; Chuanhao Lu1,2; Limei Deng1,2; Gangcai Liu1
第一作者单位Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chinese Academy of Sciences, Institute of Mountain Hazards and Environment, Chinese Academy of Science & Water Resources Ministry, Chengdu 610041, China ; University of Chinese Academy of Sciences, Beijing 100049, China
通讯作者单位Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chinese Academy of Sciences, Institute of Mountain Hazards and Environment, Chinese Academy of Science & Water Resources Ministry, Chengdu 610041, China
通讯作者Gangcai Liu
2018
发表期刊GEOMORPHOLOGY
ISSN0169-555X
EISSN1872-695X
卷号316页码:35-43
文章类型Article
产权排序1
摘要Rock disintegration and cation release not only impact on terrestrial geomorphology but also provide nutrients for plants. Further, fractal theory has been widely used to characterize the distribution of fragments in rocks for measuring the degree of disintegration. Yet the effects of an acidic environment on the trajectory of fractal dimensions of rock disintegration and cation release are not fully clear. Therefore, to investigate the impacts of a solution's pH on disintegration and cation release from the purple rock in southwest China, a series of laboratory experiments were performed by soaking the purple rocks in solutions with pHs from 2.5 to 7.0, over 24 treatment cycles. The results show that the lower the pH, the fewer cycles required to obtain a stable fractal dimension. The fractal dimension of purple rock under different pH values approached three after 24 treatment cycles, until decay ratios (the mass of decayed rock of <2 mm clastic particles to sampled rock mass) were >90%. Acidic treatment increased cation release, especially when the pH value of the solution was below 3.5. Compared with a deionised water soaking solution, the amounts of K+, Na+, Ca2+, and Mg2+ were increased by 4.92, 1.27, 1.12, and 1.08 times with pH values of 2.5, 3.5, 4.5 and 5.6 soaking solution, respectively, at the disintegration stage. In addition, the release of Ca2+ and me(+) were more sensitive to acid than that of K+ and Na+, and Ca2+ weathering occupied the dominant position in the cation weathering rates. Moreover, due to disintegration processes that transformed each rock sample into fragments, fresh surfaces were exposed from which cations were liberated, creating a significant (p < 0.05 top < 0.01) positive correlation between 5 and 20 mm particles and cation release, while a negative relationship (p < 0.05 to p < 0.01) was found between <2 mm particles and cation release. (C) 2018 Elsevier B.V. All rights reserved.
关键词Rock disintegration Cation release Acid solution Mudstone
DOI10.1016/j.geomorph.2018.05.009
收录类别SCI
语种英语
WOS记录号WOS:000437961900003
引用统计
文献类型期刊论文
条目标识符http://ir.imde.ac.cn/handle/131551/23434
专题山地表生过程与生态调控重点实验室
作者单位1.Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chinese Academy of Sciences, Institute of Mountain Hazards and Environment, Chinese Academy of Science & Water Resources Ministry, Chengdu 610041, China;
2.University of Chinese Academy of Sciences, Beijing 100049, China
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Jixia Zhao,Chuanhao Lu,Limei Deng,et al. Impacts of simulated acid solution on the disintegration and cation release of purple rock (mudstone) in Southwest China[J]. GEOMORPHOLOGY,2018,316:35-43.
APA Jixia Zhao,Chuanhao Lu,Limei Deng,&Gangcai Liu.(2018).Impacts of simulated acid solution on the disintegration and cation release of purple rock (mudstone) in Southwest China.GEOMORPHOLOGY,316,35-43.
MLA Jixia Zhao,et al."Impacts of simulated acid solution on the disintegration and cation release of purple rock (mudstone) in Southwest China".GEOMORPHOLOGY 316(2018):35-43.
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