Wind erosion on the north-eastern Tibetan Plateau: constraints from OSL and U-Th dating of playa salt crust in the Qaidam Basin

ISL OpenIR > 青海盐湖研究所知识仓储

	Wind erosion on the north-eastern Tibetan Plateau: constraints from OSL and U-Th dating of playa salt crust in the Qaidam Basin
	Han, Wenxia1,2,3 ; Ma, Zhibang 4,5; Lai, Zhongping 1,2,6; Appel, Erwin 7; Fang, Xiaomin 8,9; Yu, Lupeng 6,10
	2014-05-01
发表期刊	EARTH SURFACE PROCESSES AND LANDFORMS
卷号	39 期号:6 页码:779-789
关键词	Osl Dating Playa Salt Crust Qaidam Basin Wind Erosion U-th Dating
摘要	The arid Qaidam Basin is the largest (~3.88 x 10(4) km(2)) basin on the north-eastern Tibetan Plateau. Wind erosion in the area has been regarded as an important trigger for intra-basin tectonic balance upheaval, geomorphologic development and as a major supplier of dust to the Chinese Loess Plateau downwind. An initial estimate of the rate of wind erosion (Kapp et al., 2011) based on geological cross-sections has suggested up to 3.2 x 10(4) km(3) of sediments has been deflated over the past 2.8 Ma, lowering the landscape by an average of 0.29 mm/yr. In this paper we re-evaluate this estimate by dating surface crusts present on three playas within the basin. Understanding the development of these playas is crucial to assessing the overall role of the wind in shaping the regional landscape because they are typically capped with a thick salt crust which effectively protects them from wind erosion. Optically stimulated luminescence (OSL) and U-series dating from a pit section and from the top of a deep drill core, together with results from magnetostratigraphy and a climate proxy record correlated to the marine oxygen isotope record, are used here to determine the age of the playa plains and suggest that the salt crusts have an age of c. 0.1 Ma. This young age and the wide distribution of resistant thick salt crusts of the playa plains indicate a much lower degree of wind erosion than previously suggested. The crusts protect the surface from significant surface erosion (including sediment exhumation and unloading) and whilst some wind erosion does occur, it is unlikely to be sufficient to trigger tectonic uplift of the basin or to be a major dust source for the Loess Plateau as previously suggested. Copyright (c) 2013 John Wiley & Sons, Ltd.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/5655
专题	青海盐湖研究所知识仓储中国科学院青海盐湖研究所盐湖地质与环境实验室
作者单位	1.Chinese Acad Sci, Key Lab Salt Lake Resources & Chem, Xining, Peoples R China 2.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining, Peoples R China 3.Chinese Acad Sci, Inst Earth & Environm, State Key Lab Loess & Quaternary Geol, Xian, Peoples R China 4.Chinese Acad Sci, Key Lab Cenozo Geol & Environm, Beijing 100085, Peoples R China 5.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100085, Peoples R China 6.Chinese Acad Sci, State Key Lab Cryospher Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou, Peoples R China 7.Univ Tubingen, Fachbereich Geowissensch, Tubingen, Germany 8.Chinese Acad Sci, Key Lab Continental Collis & Plateau Uplift, Beijing 100085, Peoples R China 9.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China 10.Qinghai Geol Survey Inst, Xining, Peoples R China
推荐引用方式 GB/T 7714	Han, Wenxia,Ma, Zhibang,Lai, Zhongping,et al. Wind erosion on the north-eastern Tibetan Plateau: constraints from OSL and U-Th dating of playa salt crust in the Qaidam Basin[J]. EARTH SURFACE PROCESSES AND LANDFORMS,2014,39(6):779-789.
APA	Han, Wenxia,Ma, Zhibang,Lai, Zhongping,Appel, Erwin,Fang, Xiaomin,&Yu, Lupeng.(2014).Wind erosion on the north-eastern Tibetan Plateau: constraints from OSL and U-Th dating of playa salt crust in the Qaidam Basin.EARTH SURFACE PROCESSES AND LANDFORMS,39(6),779-789.
MLA	Han, Wenxia,et al."Wind erosion on the north-eastern Tibetan Plateau: constraints from OSL and U-Th dating of playa salt crust in the Qaidam Basin".EARTH SURFACE PROCESSES AND LANDFORMS 39.6(2014):779-789.