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Late Pliocene Monsoonal Rainfall Gradients in Western China Recorded by the Eolian Deposits From the Linxia Basin, NE Tibetan Plateau
Zan, JB (Zan, Jinbo)1,2,3; Fang, XM (Fang, Xiaomin)1,2,3; Li, XJ (Li, Xiaojing)1,2,3; Zhang, WL (Zhang, Weilin)1,2,3; Yan, MD (Yan, Maodu)1,2,3; Shen, MM (Shen, Miaomiao)1,2,3
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
2018-08-16
Volume123Issue:15Pages:8047-8061
DOI10.1029/2018JD028712
Abstract

Loess and red clay sediments from the Chinese Loess Plateau (CLP) contain a wealth of information about variations in the Asian monsoon and the aridification history of the Asian interior. However, relatively little is known about late Pliocene palaeoenvironmental evolution and the variations in the gradients of monsoonal rainfall in the western part of the CLP, due to the poor exposure of pre-Quaternary eolian deposits and uncertainties in the interpretation of paleoclimatic proxies in most parts of the region. To address these issues, we conducted a detailed rock magnetic investigation of newly drilled eolian sequences (spanning 3.7-2.4Ma) from the Linxia Basin, NE Tibetan Plateau. Our results demonstrate that pedogenically formed fine magnetic grains are responsible for the magnetic enhancement of loess-red clay sediments from the basin. Spatially, a clear decrease in magnetic susceptibility and its frequency dependence is observed between the central and western CLP, indicating that the East Asian summer monsoon already exerted a major influence on the amount and distribution of late Pliocene rainfall in the Linxia Basin. After evaluating the validity of magneto-climofunctions, we attempt to reconstruct late Pliocene-early Pleistocene monsoonal precipitation in the NE margin of the Tibetan Plateau. The results demonstrate that the difference in late Pliocene monsoonal rainfall between the study area and Chaona in the central CLP was about 300-400mm. This value is higher than that of the present day, indicating a steepened gradient in monsoonal rainfall between the central and western CLP during the late Pliocene.

Subject Area地质学
WOS IDWOS:000443566900015
Language英语
Indexed BySCIE
KeywordRed Clay Deposits Loess Plateau Magnetic-properties Grain-size Paleoclimatic Significance Astronomical Timescale Modern Soils Susceptibility Evolution Climate
WOS Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences
Cooperation Status国内
ISSN2169-897X
Department大陆碰撞与高原隆升重点实验室
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8568
Collection图书馆
Corresponding AuthorZan, JB (Zan, Jinbo)
Affiliation1.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China;
2.Chinese Acad Sci, Key Lab Continental Collis & Plateau Uplift, Inst Tibetan Plateau Res, Beijing, Peoples R China;
3.Univ Chinese Acad Sci, Beijing, Peoples R China.
Recommended Citation
GB/T 7714
Zan, JB ,Fang, XM ,Li, XJ ,et al. Late Pliocene Monsoonal Rainfall Gradients in Western China Recorded by the Eolian Deposits From the Linxia Basin, NE Tibetan Plateau[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(15):8047-8061.
APA Zan, JB ,Fang, XM ,Li, XJ ,Zhang, WL ,Yan, MD ,&Shen, MM .(2018).Late Pliocene Monsoonal Rainfall Gradients in Western China Recorded by the Eolian Deposits From the Linxia Basin, NE Tibetan Plateau.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(15),8047-8061.
MLA Zan, JB ,et al."Late Pliocene Monsoonal Rainfall Gradients in Western China Recorded by the Eolian Deposits From the Linxia Basin, NE Tibetan Plateau".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.15(2018):8047-8061.
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