Cosmogenic nuclides (10Be and 26Al) erosion rate constraints in the Badain Jaran Desert, northwest China: implications for surface erosion mechanisms and landform evolution

• Published in: Geosciences journal (Seoul, Korea) Vol. 23; no. 1; pp. 59 - 68
• Main Authors: Zhao, Tong, Liu, Wenjing, Xu, Zhifang, Liu, Taoze, Xu, Sheng, Cui, Lifeng, Shi, Chao
• Format: Journal Article
• Language: English
• Published: Seoul The Geological Society of Korea 01-02-2019; Springer Nature B.V; 한국지질과학협의회
• Subjects: Arid regions; Arid zones; Climate; Deserts; Earth and Environmental Science; Earth Sciences; Erosion control; Erosion mechanisms; Erosion rates; Evolution; Geological time; Landforms; Nuclides; Pleistocene; Tectonics; Wind erosion; 지질학; Badain Jaran Desert; erosion rate; cosmogenic nuclides; Badain Jaran Desert; landform evolution; erosion mechanisms
• ISSN: 1226-4806; 1598-7477
• DOI: 10.1007/s12303-018-0010-7

Both tectonics and climate affect surface erosion and change the landform. Long-term surface erosion rates determined by in situ produced cosmogenic nuclides are useful quantitative constraints for landform evolution in geological time scale. Measurements of cosmogenic
10
Be and
26
Al in the granitic rocks exposed in the Badain Jaran Desert, give a mean erosion rate of 7.3 ± 2.6 m/Ma, which is an order of magnitude higher than those reported in other extremely arid regions. Tectonic activity is supposed to be the first order control on regional erosion rate by comparing the 10Be erosion rates of arid regions with different precipitation ranges and tectonic activities worldwide. However the higher erosion rates in the Badain Jaran Desert compared with other arid regions within the stable tectonic background were attributed to the wind erosion and periodically warmer and wetter climate since late Pleistocene. Besides, the estimated eroded mass flux of 7.8 × 10
4
t/y suggests that erosion products of bedrocks in the Badian Jaran Desert only contribute minor desert deposits, which indicates massive exogenous materials input to the desert.