Determination of regolith production rates from 238U-234U-230Th disequilibrium in deep weathering profiles (Longnan, SE China)

The present study seeks to evaluate the application of the 238U-234U-230Th radioactive disequilibrium methodology for the determination of the regolith production rates in thick weathering profiles marked by long histories, encountered under various climate regimes, but still very little studied by...

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Bibliographic Details
Published in:Chemical geology 2021-07, Vol.574, p.120241, Article 120241
Main Authors: Jia, Guo-Dong, Chabaux, François, Van der Woerd, Jérôme, Pelt, Eric, di Chiara Roupert, Raphaël, Ackerer, Julien, Zhao, Zhi-Qi, Yang, Ye, Xu, Sheng, Liu, Cong-Qiang
Format: Article
Language:English
Subjects:
Earth Sciences
In situ 10Be
Long-term weathering rate
Polyphased erosion
Sciences of the Universe
Tectonics
Thick granitic profile
U-series nuclides
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Summary:The present study seeks to evaluate the application of the 238U-234U-230Th radioactive disequilibrium methodology for the determination of the regolith production rates in thick weathering profiles marked by long histories, encountered under various climate regimes, but still very little studied by these techniques. For this purpose, 238U-234U-230Th disequilibria have been analyzed in the top 11 m of a lateritic profile developed on a granitic bedrock in south China (Longnan, Jiangxi Province) under a subtropical climate. The results demonstrate that in such a weathering profile the determination of weathering rates from the analysis of U-series nuclides in bulk rock samples cannot be recovered by applying in one step to the entire alteration profile the modeling approach classically used to interpret the U-series nuclides, i.e. the “gain and loss” model. The modeling has to be made on subsections of relatively small size (
ISSN:0009-2541
1872-6836
DOI:10.1016/j.chemgeo.2021.120241