The long-term denudation rate of granitic regolith in Qinhuangdao, North China determined from the in situ depth profile of the cosmogenic nuclides 26Al and 10Be

Cui, L., Liu, C., Xu, S., Zhao, Z., Tu, C., Liu, T. and Ding, H. (2014) The long-term denudation rate of granitic regolith in Qinhuangdao, North China determined from the in situ depth profile of the cosmogenic nuclides 26Al and 10Be. Chinese Science Bulletin, 59(34), pp. 4823-4828. (doi: 10.1007/s11434-014-0601-2)

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Abstract

This study quantifies the surface denudation rate of granitic regolith via the application of the in situ cosmogenic 26Al and 10Be depth profile in China. The concentration ranges of 26Al and 10Be in the quartz along the ~3-m granitic regolith profile in Qinhuangdao are (4.9–23.1) × 105 and (2.3–36.6) × 104 atoms/g, respectively. With the exception of the surface sample, both 26Al and 10Be concentrations decrease exponentially with sample depth. The Chi-square best-fitting results revealed a total denudation rate of ~9 m/Ma averaged over a 103–105 a timescale, which is lower than the values observed in global granitic outcrops. Compared with global datasets, the flat terrain due to the lack of tectonic activities is most likely the dominant factor that controls the local denudation process. The surface sample offsets from the theoretical cosmogenic nuclide distribution implies that the denudation rate from river basin sediment could be overestimated because of the bioturbation in the surficial soil layer.

Item Type:Articles
Additional Information:This work was supported by the National Natural Science Foundation of China (41130536, 41210004) and the State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences (9014).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Xu, Dr Sheng
Authors: Cui, L., Liu, C., Xu, S., Zhao, Z., Tu, C., Liu, T., and Ding, H.
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Chinese Science Bulletin
Publisher:Springer Verlag
ISSN:1001-6538
ISSN (Online):1861-9541
Published Online:16 August 2014

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