Arid
DOI10.1016/j.epsl.2016.05.008
Paleoenvironmental changes recorded in a luminescence dated loess/paleosol sequence from the Tianshan Mountains, arid central Asia, since the Penultimate Glaciation
Li, Guoqiang; Rao, Zhiguo; Duan, Yanwu; Xia, Dunsheng; Wang, Leibin; Madsen, David B.; Jia, Jia; Wei, Haitao; Qiang, Mingrui; Chen, Jianhui; Chen, Fahu
通讯作者Li, Guoqiang
来源期刊EARTH AND PLANETARY SCIENCE LETTERS
ISSN0012-821X
EISSN1385-013X
出版年2016
卷号448页码:1-12
英文摘要

Mid-latitude arid central Asia (ACA) is one of the driest regions in the world and is a key source area of global atmospheric dust. Loess records of paleoclimatic changes in ACA are complex and interpretations are problematic due primarily to the lack of robust chronologies. Quartz OSL and K-feldspar pIRIR dating methods were employed to date 8 quartz and 30 K-feldspar samples from a 30 m loess sequence (BYH10 section) on the northern slope of the Tianshan Mountains, central ACA, northwest China. The reliability of quartz and K-feldspar ages was monitored by internal checks of luminescence characteristics and by comparison of the quartz and K-feldspar ages. The section lithology, proxy indexes of grain size and magnetic susceptibility, and the high resolution OSL chronology together indicate: (1) Quartz OSL dating can be used to date ACA loess samples less than 40 ka, while K-feldspar pIRIR dating is reliable for loess samples at least as old as 150 ka from ACA; (2) Aeolian loess began to be deposited on the northern slope of Tianshan Mountains beginning at least 145 ka ago, and was deposited primarily during the penultimate and last glaciation periods; (3) Rapid loess deposition occurred during MIS 6, MIS 4 to early mid MIS 3, and MIS 2, but little or no loess deposition occurred during MIS 5, MIS 3a and MIS 1; (4) This loess depositional sequence is comparable to previously published stalagmite growth records in the region on glacial-interglacial cycles. Rapid dust deposition and lack of stalagmite growth during glacials, and lack of loess deposition and stalagmite growth during interglacials, indicate a climatic pattern of wet warm (interglacial) and dry-cold (glacial) climatic regimes on orbital cycles in ACA; (5) Variation in the loess deposition rates in ACA was much larger than in the central loess plateau during the last glaciation; (6) Depositional hiatuses of >50 kyr occur in ACA loess sequences, and high resolution chronologies are needed when reconstructing past climatic changes. (C) 2016 Elsevier B.V. All rights reserved.


英文关键词arid central Asia luminescence dating depositional hiatus loess Tianshan Mountains
类型Article
语种英语
国家Peoples R China
收录类别SCI-E
WOS记录号WOS:000378457600001
WOS关键词LATE QUATERNARY LOESS ; CHINESE LOESS ; CLIMATE DYNAMICS ; QUARTZ OSL ; TIEN-SHAN ; ILI BASIN ; HOLOCENE ; LAKE ; XINJIANG ; IRSL
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
来源机构兰州大学
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/192291
作者单位Lanzhou Univ, Coll Earth & Environm Sci, Key Lab Western Chinas Environm Syst, Minist Educ, Lanzhou 730000, Peoples R China
推荐引用方式
GB/T 7714
Li, Guoqiang,Rao, Zhiguo,Duan, Yanwu,et al. Paleoenvironmental changes recorded in a luminescence dated loess/paleosol sequence from the Tianshan Mountains, arid central Asia, since the Penultimate Glaciation[J]. 兰州大学,2016,448:1-12.
APA Li, Guoqiang.,Rao, Zhiguo.,Duan, Yanwu.,Xia, Dunsheng.,Wang, Leibin.,...&Chen, Fahu.(2016).Paleoenvironmental changes recorded in a luminescence dated loess/paleosol sequence from the Tianshan Mountains, arid central Asia, since the Penultimate Glaciation.EARTH AND PLANETARY SCIENCE LETTERS,448,1-12.
MLA Li, Guoqiang,et al."Paleoenvironmental changes recorded in a luminescence dated loess/paleosol sequence from the Tianshan Mountains, arid central Asia, since the Penultimate Glaciation".EARTH AND PLANETARY SCIENCE LETTERS 448(2016):1-12.
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