Subtropical denudation rates of granitic regolith along a hill ridge in Longnan, SE China derived from cosmogenic nuclide depth-profiles

doi:10.1016/j.jseaes.2015.12.006

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院页岩气与地质工程重点实验室

	Subtropical denudation rates of granitic regolith along a hill ridge in Longnan, SE China derived from cosmogenic nuclide depth-profiles
	Cui, Li-Feng 1,2; Liu, Cong-Qiang 1; Xu, Sheng 3; Zhao, Zhi-Qi 1; Liu, Tao-Ze 1; Liu, Wen-Jing 4; Zhang, Zhuo-Jun 1,2
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2016-03-01
卷号	117 页码:146-152
关键词	TCNs Be-10 Al-26 Soil erosion Chemical weathering Geomorphic evolution
DOI	10.1016/j.jseaes.2015.12.006
文献子类	Article
英文摘要	The denudation rates of granitic regolith are essential to our understanding of the geomorphic changes and landscape evolution of a region and for soil resource management. We present denudation rates derived from four regolith profiles along a granitic slope in Longnan, southeastern China, using depth profiles of in-situ produced cosmogenic Be-10 and Al-26. The concentration ranges of Be-10, Al-26, and Al-26/Be-10 ratio were 2.98 x 10(4)-1.72 x 10(5) atoms/g, 2.18 x 10(5)-1.12 x 10(6) atoms/g, and 6.07-7.50, respectively. Analysis of the results shows that the surface-lowering rates are 19 +/- 3, 41 +/- 4, 47 +/- 4, 22 +/- 3 m/Ma for the four profiles from the foot of the hill to the top along the hillslope. The mean denudation rate for the four profiles is similar to 30 m/Ma. This rate is lower than that derived by other methods in nearby areas and also lower than the mean global denudation rate in basins deduced from 10Be levels in river sediment; this suggests an unevenness of the erosion process on a basin scale. The denudation rate at the ridge is twice that estimated for the summit and the foothill, indicating that the hillslope has not reached its steady state. Thus, the slopes below the ridge may become smoother and the ridge sharper in the long-term landscape evolution. The difference in topography may account for the variance among the profiles. In addition, bioturbation may have contributed to the lower concentration in the surface layer at the foot of the hill, producing a higher denudation rate than the average for the basin. The concentration of insoluble element Zr in the soil surface layer and fresh bedrock suggests that chemical weathering accounts for about one third of the denudation rate. (C) 2016 Published by Elsevier Ltd.
WOS关键词	PHYSICAL EROSION ; CRITICAL ZONE ; TERM RATES ; U-SERIES ; BE-10 ; AL-26 ; SEDIMENTS ; SURFACES ; UNDERSTAND ; CALIFORNIA
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000370111000012
资助机构	National Natural Science Foundation of China(41130536 ; National Natural Science Foundation of China(41130536 ; State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences(9014) ; State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences(9014) ; 41210004 ; 41210004 ; 2013CB956401) ; 2013CB956401) ; National Natural Science Foundation of China(41130536 ; National Natural Science Foundation of China(41130536 ; State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences(9014) ; State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences(9014) ; 41210004 ; 41210004 ; 2013CB956401) ; 2013CB956401)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/62046]
专题	地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
作者单位	1.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550002, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100029, Peoples R China 3.Scottish Univ Environm Res Ctr, Glasgow G75 0QF, Lanark, Scotland 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Cui, Li-Feng,Liu, Cong-Qiang,Xu, Sheng,et al. Subtropical denudation rates of granitic regolith along a hill ridge in Longnan, SE China derived from cosmogenic nuclide depth-profiles[J]. JOURNAL OF ASIAN EARTH SCIENCES,2016,117:146-152.
APA	Cui, Li-Feng.,Liu, Cong-Qiang.,Xu, Sheng.,Zhao, Zhi-Qi.,Liu, Tao-Ze.,...&Zhang, Zhuo-Jun.(2016).Subtropical denudation rates of granitic regolith along a hill ridge in Longnan, SE China derived from cosmogenic nuclide depth-profiles.JOURNAL OF ASIAN EARTH SCIENCES,117,146-152.
MLA	Cui, Li-Feng,et al."Subtropical denudation rates of granitic regolith along a hill ridge in Longnan, SE China derived from cosmogenic nuclide depth-profiles".JOURNAL OF ASIAN EARTH SCIENCES 117(2016):146-152.