DOI: 10.1016/j.palaeo.2014.08.025
论文题名: Intensification of aridity in the eastern margin of the Tibetan Plateau since 300ka BP inferred from loess-soil sequences, western Sichuan Province, southwest China
作者: Qiao Y. ; Qi L. ; Liu Z. ; Wang Y. ; Yao H. ; Yang J. ; Zhao Z.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 414 起始页码: 192
结束页码: 199
语种: 英语
英文关键词: Aridification
; Eastern margin of the Tibetan Plateau
; Grain-size
; Loess-palaeosol sequence
; Major element geochemistry
; Organic carbon isotopes
英文摘要: The climate in the eastern margin of the Tibetan Plateau (TP) is mainly controlled by the Indian Ocean summer monsoon and the TP monsoon. Widely distributed aeolian deposits in this region are one of the best terrestrial materials for studies on the evolutionary history of the Indian summer monsoon and the climatic response to uplift of the TP. In this study, two loess-palaeosol sequences from the western Sichuan Province in southwest China were studied in detail using geochemical and sedimentological methods. Carbon isotope compositions of organic matter, major element geochemistry and grain-size records of these two loess-palaeosol sequences indicate that the extent of aridity in the eastern margin of the TP increased rapidly between 300 and 150ka BP and stabilized at a relatively higher level after 150ka BP. Marine records from the Indian Ocean indicate that the Indian summer monsoon did not experience obvious weakening since 300ka BP. The deep-sea δ18O record, which reflects changes in global ice volume, also lacks any obvious changes during this period. Therefore, we interpret this palaeoclimate event to reflect the decreased influence of the Indian Ocean summer monsoon on this region, which is related to the uplift of the TP since 300ka BP. This process of increasing aridity is a local palaeoclimate event, which is not recorded in the loess-palaeosol sequences in the Chinese Loess Plateau in northern China where the climate is mainly controlled by the East Asian monsoon. This indicates that the climate response to the uplift of the TP differs in different monsoon regions. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69208
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, China; Key Laboratory of Neotectonic Movement and Geohazard, Ministry of Land and Resources, Beijing, China
Recommended Citation:
Qiao Y.,Qi L.,Liu Z.,et al. Intensification of aridity in the eastern margin of the Tibetan Plateau since 300ka BP inferred from loess-soil sequences, western Sichuan Province, southwest China[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,414