Paleoclimatic significance of mineral magnetic properties of loess sediments in northeastern Qinghai-Tibetan Plateau

doi:10.1360/02wd0567

IEECAS OpenIR > 黄土与第四纪地质国家重点实验室（1985-2004）

	Paleoclimatic significance of mineral magnetic properties of loess sediments in northeastern Qinghai-Tibetan Plateau
	Wang, XY; Lu, HY; Li, Z; Deng, CL; Tan, HB; Song, YG
	2003-10
发表期刊	CHINESE SCIENCE BULLETIN
卷号	48 期号:19 页码:2126-2133
文章类型	Article
摘要	Loess deposit in the northeastern Qinghai-Tibetan Plateau offers an excellent record of climate and environment changes in this region. We have conducted multiparameter mineral magnetic analyses of samples of loess deposits from the Dongchuan, Lalakou and Panzishan sections. The methods used include magnetic susceptibility, frequency-dependent susceptibility, temperature-dependent susceptibility, isothermal remanent magnetization acquisition, and magnetic hysteresis loops. The results reveal that magnetite is the dominant contributor to magnetic susceptibility. Maghemite and hematite is also present in the loess layers and paleosol horizons. The higher concentration of maghemite in paleosols suggests that the formation of maghemite occurred during in situ pedogenesis, which plays an important role in the enhancement of the magnetic susceptibility. Similar to that in the Chinese Loess Plateau lying to the east of the Liupan Mountains, magnetic granulometry in the studied loess and paleosols is predominantly pseudo-single-domain (PSD). However, the mean grain-size of the ferrimagnetic minerals in loess is evidently coarser (larger PSD and multidomain-like) than in paleosols (mainly PSD). The magnetic susceptibility of loess and paleosols is positively correlated with the content of ultrafine magnetite/maghemite grains, and hence with the intensity of in situ pedogenesis. Therefore, the enhanced magnetic susceptibility in the studied loess-paleosol sequences can be interpreted as being due to climatically induced in situ pedogenesis.
关键词	mineral magnetism loess-paleosol Qinghai-Tibetan Plateau magnetic susceptibility
学科领域	Science & Technology - Other Topics
DOI	10.1360/02wd0567
关键词[WOS]	TEMPERATURE-DEPENDENT SUSCEPTIBILITY ; NW-SE TRANSECT ; CHINESE LOESS ; HOLOCENE LOESS ; DEPOSITS ; SEQUENCE ; SECTION ; RECORD
收录类别	SCI ; SCIE
语种	英语
WOS研究方向	Multidisciplinary Sciences
WOS记录号	WOS:000186305300019
出版者	SCIENCE PRESS
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/361006/12023
专题	黄土与第四纪地质国家重点实验室（1985-2004）
推荐引用方式 GB/T 7714	Wang, XY,Lu, HY,Li, Z,et al. Paleoclimatic significance of mineral magnetic properties of loess sediments in northeastern Qinghai-Tibetan Plateau[J]. CHINESE SCIENCE BULLETIN,2003,48(19):2126-2133.
APA	Wang, XY,Lu, HY,Li, Z,Deng, CL,Tan, HB,&Song, YG.(2003).Paleoclimatic significance of mineral magnetic properties of loess sediments in northeastern Qinghai-Tibetan Plateau.CHINESE SCIENCE BULLETIN,48(19),2126-2133.
MLA	Wang, XY,et al."Paleoclimatic significance of mineral magnetic properties of loess sediments in northeastern Qinghai-Tibetan Plateau".CHINESE SCIENCE BULLETIN 48.19(2003):2126-2133.