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 | |
刊名 | GEOMORPHOLOGY |
2018 | |
卷号 | 316页码:35-43 |
关键词 | Rock disintegration Cation release Acid solution Mudstone |
ISSN号 | 0169-555X |
DOI | 10.1016/j.geomorph.2018.05.009 |
通讯作者 | Gangcai Liu |
产权排序 | 1 |
英文摘要 | 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. |
电子版国际标准刊号 | 1872-695X |
语种 | 英语 |
WOS记录号 | WOS:000437961900003 |
内容类型 | 期刊论文 |
源URL | [http://ir.imde.ac.cn/handle/131551/23434] |
专题 | 成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室 成都山地灾害与环境研究所_山地灾害与地表过程重点实验室 |
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 |
推荐引用方式 GB/T 7714 | 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. |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论