DOI: 10.1016/j.quascirev.2016.02.025
Scopus记录号: 2-s2.0-84960353326
论文题名: Magnetostratigraphic age and monsoonal evolution recorded by the thickest Quaternary loess deposit of the Lanzhou region, western Chinese Loess Plateau
作者: Zhang J. ; Li J. ; Guo B. ; Ma Z. ; Li X. ; Ye X. ; Yu H. ; Liu J. ; Yang C. ; Zhang S. ; Song C. ; Hui Z. ; Peng T.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 139 起始页码: 17
结束页码: 29
语种: 英语
英文关键词: Lanzhou loess
; Magnetostratigraphy
; Monsoonal evolution
; Western CLP
Scopus关键词: Atmospheric thermodynamics
; Deposits
; Grain size and shape
; Landforms
; Magnetic susceptibility
; Tectonics
; Wind
; East Asian summer monsoon
; East Asian winter monsoon
; Glacial-interglacial cycles
; Lanzhou
; Magnetostratigraphy
; Monsoonal evolution
; Western Chinese Loess Plateau
; Western CLP
; Sediments
; accumulation
; glacial-interglacial cycle
; grain size
; ice sheet
; loess
; magnetic susceptibility
; magnetostratigraphy
; monsoon
; Northern Hemisphere
; paleomagnetism
; Pliocene
; synchrony
; China
; Gansu
; Lanzhou
; Loess Plateau
; Qinghai-Xizang Plateau
英文摘要: The loess-paleosol sequences of the Chinese Loess Plateau (CLP) are major paleoclimatic archives which document the evolution of the East Asian Monsoon (EAM) and changes in the Northern Hemisphere ice sheets during the Quaternary glacial-interglacial cycles. However, the mechanisms regulating the trend of EAM variations on a tectonic scale are unclear. The loess deposits of the western CLP, which have a close relationship with tectonics and climate, are much better-suited to exploring these mechanisms than those of the central CLP. However, studies of long-term EAM evolution from the western CLP have been hindered by the lack of long, accurately-dated sequences with high sediment accumulation rates. Here, we address this problem via high resolution magnetostratigraphic, magnetic susceptibility and grain-size analyses of a 416.2 m-long drill core located at Xijin Village, near Lanzhou. Paleomagnetic dating indicates that the basal age of the Xijin loess is ~2.2 Ma. The χ and grain-size records reveal that the East Asian Summer Monsoon (EASM) and East Asian Winter Monsoon (EAWM) strengthened synchronously at ~1.24 Ma. Subsequently, during interglacial periods, the EASM began to penetrate, and then dominate, in the Lanzhou region. This was followed by two stepwise uptrends, commencing at ~0.87 and ~0.62 Ma, which resulted in an increasingly moist interglacial climate in the region. We suggest that the uplift of the Tibetan Plateau was largely responsible for these three stepwise enhancements of the EASM. Overall, however, the long-term trend of strengthening in EAWM in the area may have been primarily caused by long-term global cooling from the Late Pliocene onwards. © 2016 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59615
Appears in Collections: 过去全球变化的重建
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作者单位: Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China; School of Earth Sciences and Key Laboratory of Western China's Mineral Resources of Gansu Province, Lanzhou University, Lanzhou, China
Recommended Citation:
Zhang J.,Li J.,Guo B.,et al. Magnetostratigraphic age and monsoonal evolution recorded by the thickest Quaternary loess deposit of the Lanzhou region, western Chinese Loess Plateau[J]. Quaternary Science Reviews,2016-01-01,139