气候变化领域集成服务门户(CCPortal): Late Miocene-Pliocene climate evolution recorded by the red clay cover on the Xiaoshuizi planation surface, NE Tibetan Plateau

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DOI	10.5194/cp-15-405-2019
	Late Miocene-Pliocene climate evolution recorded by the red clay cover on the Xiaoshuizi planation surface, NE Tibetan Plateau
	Li X.; Peng T.; Ma Z.; Li M.; Feng Z.; Guo B.; Yu H.; Ye X.; Hui Z.; Song C.; Li J.
发表日期	2019
ISSN	18149324
起始页码	405
结束页码	421
卷号	15 期号:2
英文摘要	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.
语种	英语
scopus关键词	clay soil; climate variation; Miocene; monsoon; mountain region; paleoclimate; paleosol; pedogenesis; planation; Pliocene; precipitation (climatology); proxy climate record; red soil; summer; China; Far East; Loess Plateau; Panama [Central America]; Panama [Panama (NTN)]; Panama [Panama (PRV)]
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153221
作者单位	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
推荐引用方式 GB/T 7714	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],2019,15(2).
APA	Li X..,Peng T..,Ma Z..,Li M..,Feng Z..,...&Li J..(2019).Late Miocene-Pliocene climate evolution recorded by the red clay cover on the Xiaoshuizi planation surface, NE Tibetan Plateau.Climate of the Past,15(2).
MLA	Li X.,et al."Late Miocene-Pliocene climate evolution recorded by the red clay cover on the Xiaoshuizi planation surface, NE Tibetan Plateau".Climate of the Past 15.2(2019).