Iron oxide characteristics of the Chinese loess-red clay sequences and their implications for the evolution of the East Asian summer monsoon since the Late Oligocene

doi:10.1016/j.palaeo.2020.109604

	Iron oxide characteristics of the Chinese loess-red clay sequences and their implications for the evolution of the East Asian summer monsoon since the Late Oligocene
	Zhao, Hui 3,4; Qiang, Xiaoke 1,3; Xu, Xinwen 2; Sun, Youbin 1,3
刊名	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
	2020-04-01
卷号	543 页码:9
关键词	Chinese Loess Plateau Rock magnetism Fe-d/Fe-t Zhuanglang Lingtai Monsoon evolution
ISSN号	0031-0182
DOI	10.1016/j.palaeo.2020.109604
通讯作者	Zhao, Hui(zhaohui@ieecas.cn)
英文摘要	The most significant climatic change in East Asia involved the formation and evolution of the coupled monsoon-arid environmental system during the Cenozoic, which was dynamically linked to global cooling and the growth of the Qinghai-Tibet Plateau. However, our understanding of monsoon evolution since the Late Oligocene remains controversial due to differences in the interpretation of various environmental proxies from loess archives. In this study, the composition and relative abundance of pedogenic iron oxides of two eolian sequences from the Lingtai section and the Zhuanglang drill core were investigated using rock magnetic, optical spectroscopy, and geochemical analyses. The results indicate that while the composition of iron oxides in the Mio-Pliocene red clay and Quaternary loess-paleosol sequences is similar, the concentrations of magnetite, maghemite, hematite and goethite are quite different between loess, paleosol and red clay. The combination of magnetic proxies (magnetic susceptibility, Fe-d/Pe(t), and color a(star) values) reveals that precipitation and temperature played varying roles in driving pedogenesis and chemical weathering since the Late Oligocene. During the Late Oligocene to Early Miocene, the occurrence of relatively strong pedogenesis and chemical weathering was likely the result of high temperatures rather than high precipitation. The East Asian summer monsoon intensified during the Middle Miocene Climate Optimum (16.5-14.5 Ma), in response to global climatic warming; subsequently, during the Middle to Late Miocene, the monsoon intensity gradually weakened due to global cooling. After similar to 8 Ma, the summer monsoon strengthened substantially and reached a maximum during 4.5-2.6 Ma, possibly as a result of the uplift of the northeastern margin of the Qinghai-Tibetan Plateau during the Late Miocene. The monsoon intensity then commenced a decreasing trend in the Early Pleistocene, but then strengthened again after similar to 1.0 Ma.
资助项目	Chinese Academy of Sciences[QYZDY-SSWDQC001] ; Chinese Academy of Sciences[QYZDY-SSW-DQC010] ; National Natural Science Foundation of China[41572164] ; Key Research and Development Program of Shaanxi Province[2017ZDCXL-SF-03-01-01] ; Shaanxi Postdoctoral Science Fund[2017BSHEDZZ16]
WOS关键词	TEMPERATURE-DEPENDENT SUSCEPTIBILITY ; NORTHERN TIBETAN PLATEAU ; MAGNETIC-SUSCEPTIBILITY ; SOUTH CHINA ; XINING BASIN ; XERALF CHRONOSEQUENCE ; SEDIMENTARY ARCHIVE ; MIOCENE CLIMATE ; HOLOCENE LOESS ; 20 MA
WOS研究方向	Physical Geography ; Geology ; Paleontology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000518707600014
资助机构	Chinese Academy of Sciences ; National Natural Science Foundation of China ; Key Research and Development Program of Shaanxi Province ; Shaanxi Postdoctoral Science Fund
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/12619]
专题	地球环境研究所_古环境研究室第四纪科学与全球变化卓越创新中心
通讯作者	Zhao, Hui
作者单位	1.Chinese Acad Sci, CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China 2.Northwest Univ, Coll Urban & Environm Sci, Xian 710127, Shaanxi, Peoples R China 3.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China 4.Xian Inst Innovat Earth Environm Res, Xian 710061, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Hui,Qiang, Xiaoke,Xu, Xinwen,et al. Iron oxide characteristics of the Chinese loess-red clay sequences and their implications for the evolution of the East Asian summer monsoon since the Late Oligocene[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2020,543:9.
APA	Zhao, Hui,Qiang, Xiaoke,Xu, Xinwen,&Sun, Youbin.(2020).Iron oxide characteristics of the Chinese loess-red clay sequences and their implications for the evolution of the East Asian summer monsoon since the Late Oligocene.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,543,9.
MLA	Zhao, Hui,et al."Iron oxide characteristics of the Chinese loess-red clay sequences and their implications for the evolution of the East Asian summer monsoon since the Late Oligocene".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 543(2020):9.