Optical dating of dune sands in the northeastern deserts of China

	Optical dating of dune sands in the northeastern deserts of China
	Li, SH ; Sun, JM ; Zhao, H
刊名	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
	2002-06-25
卷号	181 期号:4 页码:419-429
关键词	optical dating quartz sand dune desert Holocene climate change
ISSN号	0031-0182
文献子类	Article
英文摘要	Optical dating has been used to obtain the ages of fossil-stabilized sand dunes from four sections in the northeastern deserts of China. Our results indicate that the optically stimulated luminescence ages of the four sections correlate well, even though the samples were collected from different deserts about 600 kin apart. Our results also indicate that active dune formation in this region lasted from the Last Glacial Maximum to about 10 ka, and that the warm climate of the Holocene was interrupted by a cold/dry dune formation episode about 3.5-1.7 ka. The Holocene Optimum in this region is between 10 and 3.6 ka, and a later warm/humid dune stabilization phase lasted from at least 1.6 to 1.0 ka. The youngest age on the uppermost sand unit yielded an age of only 40 yr, supporting the previous argument that the existence of modern active eolian sands in the regions with a mean annual precipitation of up to 450 mm is not mainly due to drought, but to extensive land cultivation over historic time. From the luminescence properties of the quartz grains, it is hypothesized that the sands in most of the sections are probably derived from more than one source, with a minor source of quartz having a different thermal history before deposition. (C) 2002 Elsevier Science B.V. All rights reserved.
WOS关键词	MU US DESERT ; STIMULATED LUMINESCENCE ; SOUTHERN-AFRICA ; QUARTZ ; SEDIMENTS ; ALIQUOTS ; KALAHARI ; PROTOCOL ; ARIDITY ; AGES
WOS研究方向	Physical Geography ; Geology ; Paleontology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000176611100003
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/77611]
专题	中国科学院地质与地球物理研究所
通讯作者	Li, SH
作者单位	1.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Li, SH,Sun, JM,Zhao, H. Optical dating of dune sands in the northeastern deserts of China[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2002,181(4):419-429.
APA	Li, SH,Sun, JM,&Zhao, H.(2002).Optical dating of dune sands in the northeastern deserts of China.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,181(4),419-429.
MLA	Li, SH,et al."Optical dating of dune sands in the northeastern deserts of China".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 181.4(2002):419-429.