globalchange  > 气候变化事实与影响
DOI: 10.5194/cp-15-405-2019
Scopus ID: 2-s2.0-85062780186
Late Miocene-Pliocene climate evolution recorded by the red clay cover on the Xiaoshuizi planation surface, NE Tibetan Plateau
Author: Li X.; Peng T.; Ma Z.; Li M.; Feng Z.; Guo B.; Yu H.; Ye X.; Hui Z.; Song C.; Li J.
Source Publication: Climate of the Past
ISSN: 18149324
Publishing Year: 2019
Volume: 15, Issue:2
pages begin: 405
pages end: 421
Language: 英语
English Abstract: The Pliocene climate and its driving mechanisms have attracted substantial scientific interest because of their potential as an analog for near-future climates. The late Miocene-Pliocene red clay sequence of the main Chinese Loess Plateau (CLP) has been widely used to reconstruct the history of interior Asian aridification and the Asian monsoon. However, red clay sequences deposited on the planation surface of the Tibetan Plateau (TP) are rare. A continuous red clay sequence was recently discovered on the uplifted Xiaoshuizi (XSZ) planation surface in the Maxian Mountains, northeastern (NE) TP. In this study, we analyzed multiple climatic proxies from the XSZ red clay sequence with the aim of reconstructing the late Miocene-early Pliocene climate history of the NE TP and to assess regional climatic differences between the central and western CLP. Our results demonstrate the occurrence of minimal weathering and pedogenesis during the late Miocene, which indicates that the climate was arid. We speculate that precipitation delivered by the paleo East Asian summer monsoon (EASM) was limited during this period and that the intensification of the circulation of the westerlies resulted in arid conditions in the study region. Subsequently, enhanced weathering and pedogenesis occurred intermittently during 4.7-3.9 Ma, which attests to an increase in effective moisture. We ascribe the arid-humid climatic transition near ∼ 4.7 Ma to the expansion of the paleo-EASM. The warming of the high northern latitudes in response to the closure of the Panama Seaway may have been responsible for the thermodynamical enhancement of the paleo-EASM system, which permitted more moisture to be transported to the NE TP. © The Author(s) 2019.
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Document Type: 期刊论文
Appears in Collections:气候变化事实与影响

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Affiliation: MOE Key Laboratory of Western China's Environmental Systems, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China; School of Earth Sciences, Key Laboratory of Western China's Mineral Resources of Gansu Province, Lanzhou University, Lanzhou, 730000, China; College of Geography Science, Nanjing Normal University, Nanjing, 210023, China

Recommended Citation:
Li X.,Peng T.,Ma Z.,et al. Late Miocene-Pliocene climate evolution recorded by the red clay cover on the Xiaoshuizi planation surface, NE Tibetan Plateau[J]. Climate of the Past,2019-01-01,15(2)
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