气候变化领域集成服务门户(CCPortal): Rock magnetic constraints for the Mid-Miocene Climatic Optimum from a high-resolution sedimentary sequence of the northwestern Qaidam Basin; NE Tibetan Plateau

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DOI	10.1016/j.palaeo.2019.109263
	Rock magnetic constraints for the Mid-Miocene Climatic Optimum from a high-resolution sedimentary sequence of the northwestern Qaidam Basin; NE Tibetan Plateau
	Guan C.; Chang H.; Yan M.; Li L.; Xia M.; Zan J.; Liu S.
发表日期	2019
ISSN	0031-0182
卷号	532
英文摘要	The thick sequence of Cenozoic deposits in the Qaidam Basin of the NE Tibetan Plateau has great potential for understanding the tectonic and climatic evolution of the region. In this study, we performed detailed rock magnetic analyses of a well-dated (~20.7–11.2 Ma) Upper Cenozoic sedimentary sequence from the Huatugou (HTG) section in the NW Qaidam Basin. The magnetic susceptibility of the sequence is relatively low before 17.4 Ma, high during 17.4–14.5 Ma, and lower after 14.5 Ma again. This pattern is consistent with the occurrence of the Mid-Miocene Climatic Optimum (MMCO) during 17.4–14.5 Ma, with global climatic cooling thereafter. Measurements of multiple rock magnetic parameters indicate a peak in the concentration of fine-grained magnetic minerals during 17.4–14.5 Ma. This feature demonstrates that the enhancement of the magnetic susceptibility is due to the pedogenic production of superparamagnetic (SP) and single domain (SD) magnetite, suggesting the occurrence of relatively high effective precipitation and high temperature in the Qaidam Basin at this time. Comparing with regional and global climatic records, the warm and humid climatic conditions coincide with the MMCO, implying that global climate changes were responsible for the climatic evolution in the Qaidam Basin throughout the MMCO. However, after 14.5 Ma, the rapid uplift of the northern Tibetan Plateau caused it to reach a critical elevation which blocked the moisture supply to the Qaidam Basin and may also have contributed to the observed climatic changes. © 2019 Elsevier B.V.
英文关键词	Global climate changes; Global warming event; Magnetic susceptibility; Paleoenvironment; Pedogenic model
语种	英语
scopus关键词	cooling; global warming; high temperature; lithostratigraphy; magnetic susceptibility; Miocene; paleoenvironment; pedogenesis; sedimentary sequence; uplift; China; Qaidam Basin; Qinghai; Qinghai-Xizang Plateau
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150856
作者单位	CAS Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, 100101, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; CAS Center for Excellence in Quaternary Science and Global Change, Xi'an, 710061, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081, China; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
推荐引用方式 GB/T 7714	Guan C.,Chang H.,Yan M.,et al. Rock magnetic constraints for the Mid-Miocene Climatic Optimum from a high-resolution sedimentary sequence of the northwestern Qaidam Basin; NE Tibetan Plateau[J],2019,532.
APA	Guan C..,Chang H..,Yan M..,Li L..,Xia M..,...&Liu S..(2019).Rock magnetic constraints for the Mid-Miocene Climatic Optimum from a high-resolution sedimentary sequence of the northwestern Qaidam Basin; NE Tibetan Plateau.Palaeogeography, Palaeoclimatology, Palaeoecology,532.
MLA	Guan C.,et al."Rock magnetic constraints for the Mid-Miocene Climatic Optimum from a high-resolution sedimentary sequence of the northwestern Qaidam Basin; NE Tibetan Plateau".Palaeogeography, Palaeoclimatology, Palaeoecology 532(2019).