气候变化领域集成服务门户(CCPortal): Wind erosion on the north-eastern Tibetan Plateau: constraints from OSL and U-Th dating of playa salt crust in the Qaidam Basin

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DOI	10.1002/esp.3483
	Wind erosion on the north-eastern Tibetan Plateau: constraints from OSL and U-Th dating of playa salt crust in the Qaidam Basin
	Han, Wenxia; Ma, Zhibang; Lai, Zhongping; Appel, Erwin; Fang, Xiaomin; Yu, Lupeng
通讯作者	Fang, XM (通讯作者)
发表日期	2014
ISSN	0197-9337
EISSN	1096-9837
起始页码	779
结束页码	789
卷号	39 期号:6
英文摘要	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.
关键词	RESOLUTION MAGNETO STRATIGRAPHY CHINESE LOESS ASTRONOMICAL CALIBRATION GEOMAGNETIC REVERSAL LACUSTRINE DEPOSITS SURROUNDING REGIONS QINGHAI PROVINCE GROWTH-CURVE CORE SG-1 C-14 AGES
英文关键词	OSL dating; Playa salt crust; Qaidam Basin; wind erosion; U-Th dating
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000334646200007
来源期刊	EARTH SURFACE PROCESSES AND LANDFORMS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258371
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]. 中国科学院青藏高原研究所,2014,39(6).
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).
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).