Distinguishing aeolian signature from lacustrine sediments of the QaidamBasin in northeastern Qinghai-Tibetan Plateau and its palaeoclimaticimplications

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	Distinguishing aeolian signature from lacustrine sediments of the QaidamBasin in northeastern Qinghai-Tibetan Plateau and its palaeoclimaticimplications
	An, FuYuan; Ma, HaiZhou; Wei, HaiCheng; Lai, ZhongPing
	2012
发表期刊	AEOLIAN RESEARCH
ISSN	1875-9637
卷号	4 期号:*页码:17-30
关键词	Qinghai-tibetan Plateau (Qtp) Qaidam Basin Saparating Aeolian
摘要	Qarhan playa is located in the eastern-central Qaidam Basin in the northeastern Qinghai-Tibetan Plateau. As a lake-depocenter since the Pleistocene and surrounded by Gobi and yardang fields, it might have deposited abundant aeolian materials. Distinguishing its aeolian signature from lacustrine sediments is important for understanding the landform processes and environmental changes, which is the focus of the current study. Based on major-elements analysis, microtextures of quartz grains, and features of grain-size frequency curves and other grain-size parameters, we demonstrate the existence of aeolian component in the lacustrine sequences of a 102 m core (ISL1A). Grain-size distribution curve statistics on 60 samples from two extreme palaeoclimate environments (hyperarid and humid), as well as multi-proxies records comparison, indicate that the mode at about 40 pm represents the aeolian component and the 10-70 pm fraction of grain-size is a valid proxy of East Asian winter monsoon, and that the 70-650 pm fraction represents the intensity of dust storms. The erosive lacustrine sediments in the western Qaidam Basin and the alluvial/fluvial fans in nearby piedmont are probably important sources for these aeolian materials. The similarities of major-element data for samples from the Qaidam Basin (both lacustrine and loess), Qinghai Lake (loess), and the Chinese Loess Plateau (loess) indicate that the Qaidam Basin is a dust source for the loess in Qinghai Lake and the Chinese Loess Plateau. (C) 2011 Elsevier B.V. All rights reserved. Qarhan playa is located in the eastern-central Qaidam Basin in the northeastern Qinghai-Tibetan Plateau. As a lake-depocenter since the Pleistocene and surrounded by Gobi and yardang fields, it might have deposited abundant aeolian materials. Distinguishing its aeolian signature from lacustrine sediments is important for understanding the landform processes and environmental changes, which is the focus of the current study. Based on major-elements analysis, microtextures of quartz grains, and features of grain-size frequency curves and other grain-size parameters, we demonstrate the existence of aeolian component in the lacustrine sequences of a 102 m core (ISL1A). Grain-size distribution curve statistics on 60 samples from two extreme palaeoclimate environments (hyperarid and humid), as well as multi-proxies records comparison, indicate that the mode at about 40 pm represents the aeolian component and the 10-70 pm fraction of grain-size is a valid proxy of East Asian winter monsoon, and that the 70-650 pm fraction represents the intensity of dust storms. The erosive lacustrine sediments in the western Qaidam Basin and the alluvial/fluvial fans in nearby piedmont are probably important sources for these aeolian materials. The similarities of major-element data for samples from the Qaidam Basin (both lacustrine and loess), Qinghai Lake (loess), and the Chinese Loess Plateau (loess) indicate that the Qaidam Basin is a dust source for the loess in Qinghai Lake and the Chinese Loess Plateau. (C) 2011 Elsevier B.V. All rights reserved.
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/2052
专题	青海盐湖研究所知识仓储盐湖地质与环境实验室
推荐引用方式 GB/T 7714	An, FuYuan,Ma, HaiZhou,Wei, HaiCheng,et al. Distinguishing aeolian signature from lacustrine sediments of the QaidamBasin in northeastern Qinghai-Tibetan Plateau and its palaeoclimaticimplications[J]. AEOLIAN RESEARCH,2012,4(*):17-30.
APA	An, FuYuan,Ma, HaiZhou,Wei, HaiCheng,&Lai, ZhongPing.(2012).Distinguishing aeolian signature from lacustrine sediments of the QaidamBasin in northeastern Qinghai-Tibetan Plateau and its palaeoclimaticimplications.AEOLIAN RESEARCH,4(*),17-30.
MLA	An, FuYuan,et al."Distinguishing aeolian signature from lacustrine sediments of the QaidamBasin in northeastern Qinghai-Tibetan Plateau and its palaeoclimaticimplications".AEOLIAN RESEARCH 4.*(2012):17-30.

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