Mineral magnetic variation of the Jingbian loess/paleosol sequence in the northern Loess Plateau of China: Implications for Quaternary development of Asian aridification and cooling

doi:10.1016/j.epsl.2005.10.020

	Mineral magnetic variation of the Jingbian loess/paleosol sequence in the northern Loess Plateau of China: Implications for Quaternary development of Asian aridification and cooling
	Deng, CL ; Shaw, J ; Liu, QS ; Pan, YX ; Zhu, RX
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2006-01-15
卷号	241 期号:1-2 页码:248-259
关键词	Chinese Loess Plateau Loess paleosol mineral magnetism magnetoclimatology Asian aridification and cooling
ISSN号	0012-821X
DOI	10.1016/j.epsl.2005.10.020
文献子类	Article
英文摘要	A high-resolution mineral magnetic investigation has been carried out on the Jingbian loess/paleosol sequence at the northern extremity of the Chinese Loess Plateau. Results show that the magnetic assemblage is dominated by large pseudo-single domain and multidomain-like magnetite with associated maghemite and hematite. Variations in the ratios of SIRM(100mT)/SIRM, SIRM(100mT)/SIRM(30mT) and SIRM(100mT)/SIRM(60mT) (SIRM is the saturation isothermal remanent magnetization; SIRM(nmT) represents the residual SIRM after an n mT alternating field demagnetization) have been used to document regional paleoclimate change in the Asian interior by correlating the mineral magnetic record with the composite delta(18)O record in deep-sea sediments. The long-term up-section decreasing trend in those ratios in both loess and paleosol units has been attributed to a long-term decrease in the relative contributions of eolian hematite during glacial extrema and of pedogenic hematite during interglacial extrema, respectively, which reveals a long-term decreasing trend in chemical weathering intensity in both glacial-stage source region (the Gobi and deserts in northwestern China) and interglacial-stage depositional area (the Loess Plateau region). We further relate this long-timescale variation to long-term increasing aridification and cooling, during both glacial extrema in the dust source region and interglacial extrema in the depositional area, over the Quaternary period. Changes in those ratios are most likely due to Quaternary aridification and cooling driven by ongoing global cooling, expansion of the Arctic ice-sheet, and progressive uplift of the Himalayan-Tibetan complex during this period. (c) 2005 Elsevier B.V. All rights reserved.
WOS关键词	TEMPERATURE-DEPENDENT SUSCEPTIBILITY ; PALEOCLIMATIC IMPLICATIONS ; PALEOSOL SEQUENCES ; HYSTERESIS LOOPS ; GRAIN-SIZE ; MYR AGO ; DEPOSITS ; CLIMATE ; RECORD ; PEDOGENESIS
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000234626300019
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/66360]
专题	中国科学院地质与地球物理研究所
通讯作者	Deng, CL
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Paleomagnetism & Geochronol Lab, SKL LE, Beijing 100029, Peoples R China 2.Univ Liverpool, Dept Earth & Ocean Sci, Geomagnetism Lab, Liverpool L69 7ZE, Merseyside, England 3.Univ Calif Santa Cruz, Dept Earth Sci, Santa Cruz, CA 95064 USA
推荐引用方式 GB/T 7714	Deng, CL,Shaw, J,Liu, QS,et al. Mineral magnetic variation of the Jingbian loess/paleosol sequence in the northern Loess Plateau of China: Implications for Quaternary development of Asian aridification and cooling[J]. EARTH AND PLANETARY SCIENCE LETTERS,2006,241(1-2):248-259.
APA	Deng, CL,Shaw, J,Liu, QS,Pan, YX,&Zhu, RX.(2006).Mineral magnetic variation of the Jingbian loess/paleosol sequence in the northern Loess Plateau of China: Implications for Quaternary development of Asian aridification and cooling.EARTH AND PLANETARY SCIENCE LETTERS,241(1-2),248-259.
MLA	Deng, CL,et al."Mineral magnetic variation of the Jingbian loess/paleosol sequence in the northern Loess Plateau of China: Implications for Quaternary development of Asian aridification and cooling".EARTH AND PLANETARY SCIENCE LETTERS 241.1-2(2006):248-259.