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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
Source PublicationAEOLIAN RESEARCH
ISSN1875-9637
Volume4Issue:*Pages:17-30
AbstractQarhan 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.
KeywordQinghai-tibetan Plateau (Qtp) Qaidam Basin Saparating Aeolian
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/2052
Collection青海盐湖研究所知识仓储
盐湖地质与环境实验室
Recommended Citation
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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