Journal
GEOMORPHOLOGY
Volume 316, Issue -, Pages 35-43Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.geomorph.2018.05.009
Keywords
Rock disintegration; Cation release; Acid solution; Mudstone
Funding
- National Natural Science Foundation Committee of China [41471232]
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available