气候变化领域集成服务门户(CCPortal): AC magnetic susceptibility studies of Chinese red clay sediments between 4.8 and 4.1 Ma: Paleoceanographic and paleoclimatic implications

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DOI	10.1029/2008JB005654
	AC magnetic susceptibility studies of Chinese red clay sediments between 4.8 and 4.1 Ma: Paleoceanographic and paleoclimatic implications
	Nie, Junsheng; King, John; Jackson, Mike; Fang, Xiaomin; Song, Yougui
通讯作者	Nie, JS (通讯作者)
发表日期	2008
ISSN	2169-9313
EISSN	2169-9356
卷号	113 期号:B10
英文摘要	Recent studies show that measuring AC magnetic susceptibility (with in-phase x ' and quadrature x '' components) versus temperature provides an effective way to map the grain-size distribution of pedogenic maghemite. Applying this method, we mapped the pedogenic maghemite grain-size distribution of samples of the red clay sediments deposited on the Chinese Loess Plateau (CLP) during the interval 4.8-4.1 Ma, during which the validity of magnetic susceptibility as an East Asian summer monsoon precipitation intensity proxy has been questioned. The results show that the pedogenic maghemite grain-size distribution is the same as in the overlying loess-paleosol sequence and in the other intervals of the red clay sequence, suggesting similar pedogenesis mechanisms and marked precipitation seasonality on the CLP between 4.8 and 4.1 Ma compared with the other intervals. We argue that the seasonal position shift of the polar westerlies produces the required precipitation seasonality and thus produces a uniform pedogenic grain-size distribution during this time interval. Reconstructing paleo-rainfall on the central CLP on the basis of surface calibration results suggests that the intensification of the East Asian summer monsoon might be a key trigger for the subsequent significant ocean and cryosphere adjustments during the Pliocene.
关键词	LOESS PLATEAU CLIMATE EVOLUTION GLACIATION DEPENDENCE TIMESCALE DEPOSITS PACIFIC MONSOON UPLIFT
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000260391600002
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257609
推荐引用方式 GB/T 7714	Nie, Junsheng,King, John,Jackson, Mike,et al. AC magnetic susceptibility studies of Chinese red clay sediments between 4.8 and 4.1 Ma: Paleoceanographic and paleoclimatic implications[J]. 中国科学院青藏高原研究所,2008,113(B10).
APA	Nie, Junsheng,King, John,Jackson, Mike,Fang, Xiaomin,&Song, Yougui.(2008).AC magnetic susceptibility studies of Chinese red clay sediments between 4.8 and 4.1 Ma: Paleoceanographic and paleoclimatic implications.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,113(B10).
MLA	Nie, Junsheng,et al."AC magnetic susceptibility studies of Chinese red clay sediments between 4.8 and 4.1 Ma: Paleoceanographic and paleoclimatic implications".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 113.B10(2008).