Rock magnetic constraints for the Mid-Miocene Climatic Optimum from a high-resolution sedimentary sequence of the northwestern Qaidam Basin, NE Tibetan Plateau

doi:10.1016/j.palaeo.2019.109263

IEECAS OpenIR > 古环境研究室

	Rock magnetic constraints for the Mid-Miocene Climatic Optimum from a high-resolution sedimentary sequence of the northwestern Qaidam Basin, NE Tibetan Plateau
	Guan, Chong 1,5; Chang, Hong3,4,5 ; Yan, Maodu 1,2,5; Li, Leyi 3,5; Xia, Mengmeng 6; Zan, Jinbo 1,2,5; Liu, Shuangchi 7
通讯作者	Chang, Hong(changh@loess.llqg.ac.cn)
	2019-10-15
发表期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN	0031-0182
卷号	532 页码:12
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 (similar to 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.
关键词	Global warming event Magnetic susceptibility Pedogenic model Paleoenvironment Global climate changes
DOI	10.1016/j.palaeo.2019.109263
关键词[WOS]	CHINESE LOESS PLATEAU ; CENOZOIC TECTONIC EVOLUTION ; CENTRAL-ASIA ; CONTINUOUS ARIDIFICATION ; TAGH RANGE ; UPLIFT ; GROWTH ; SUSCEPTIBILITY ; DEPOSITS ; RECORD
收录类别	SCI ; SCI
语种	英语
资助项目	National Basic Research Program of China[2017YFC0602803] ; Second Tibetan Plateau Scientific Expedition and Research program[2019QZKK0707] ; National Natural Science Foundation of China (NSFC)[41572166] ; National Natural Science Foundation of China (NSFC)[41420104008] ; National Natural Science Foundation of China (NSFC)[41620104002]
WOS研究方向	Physical Geography ; Geology ; Paleontology
项目资助者	National Basic Research Program of China ; Second Tibetan Plateau Scientific Expedition and Research program ; National Natural Science Foundation of China (NSFC)
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:000484871600009
出版者	ELSEVIER
引用统计	被引频次：17[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/13479
专题	古环境研究室
通讯作者	Chang, Hong
作者单位	1.Chinese Acad Sci, Inst Tibetan Plateau Res, CAS Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China 2.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 3.Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Inst Earth Environm, Xian 710061, Shaanxi, Peoples R China 4.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Shaanxi, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 6.Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China 7.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Guan, Chong,Chang, Hong,Yan, Maodu,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]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2019,532:12.
APA	Guan, Chong.,Chang, Hong.,Yan, Maodu.,Li, Leyi.,Xia, Mengmeng.,...&Liu, Shuangchi.(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,532,12.
MLA	Guan, Chong,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):12.