Application of Uranium Disequilibrium in the Study of the Weathering Rate of the Granite in Northern Guangdong

YANG Hong; ZHOU Shangzhe

doi:10.6054/j.jscnun.2019088

Journal of South China Normal University (Natural Science Edition) > 2019 > 51(5): 84-91. > DOI: 10.6054/j.jscnun.2019088

YANG Hong, ZHOU Shangzhe. Application of Uranium Disequilibrium in the Study of the Weathering Rate of the Granite in Northern Guangdong[J]. Journal of South China Normal University (Natural Science Edition), 2019, 51(5): 84-91. DOI: 10.6054/j.jscnun.2019088

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Application of Uranium Disequilibrium in the Study of the Weathering Rate of the Granite in Northern Guangdong

YANG Hong,
ZHOU Shangzhe^,

School of Geography, South China Normal University, Guangzhou 510631, China

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Received Date: January 13, 2019
Available Online: March 08, 2021

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Abstract

Abstract

In order to explore the geomorphological evolution and climatic environment changes in the chemical weathering process of the granites in northern Guangdong, Jinjiang River Basin is selected as the research area and the uranium-series isotopes disequilibrium method is used to measure the uranium concentration and ²³⁴U/²³⁸U activity ratios of river water, weathering crust and rock in the basin and calculate of chemical weathering rate of grani-te in the basin. As the results show, under the current climatic conditions, the chemical weathering rate of the grani-te weathering crust with the CIA of 86.84 is 0.038 mm/year, which means that it will take about 26 000 years for 1 m thick granite to weather; in the tropical and subtropical regions, and the main factor for rock weathering is the climate conditions with high temperature and humidity. Uranium isotopes disequilibrium can be used to quantitatively evaluate the interaction among water, soil and rock under weathering, and it also provides a new means for research on rock weathering and earth surface processes.
- rock weathering rate,
- uranium disequilibrium,
- degree of weathering

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References

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