A palaeomagnetic and mineral magnetic study of the loess sequence at Liujiapo, Xian, China
作者:
Laurence Thistlewood,
Sun Jianzhong,
期刊:
Journal of Quaternary Science
(WILEY Available online 1991)
卷期:
Volume 6,
issue 1
页码: 13-26
ISSN:0267-8179
年代: 1991
DOI:10.1002/jqs.3390060104
出版商: John Wiley&Sons, Ltd
关键词: China;loess palaeomagnetism;mineral magnetism;magnetic fabric
数据来源: WILEY
摘要:
AbstractEmploying an average vertical sampling interval of 20 cm, oriented samples were collected from 26 m of the loess section at Liujiapo, near Xian, China in order to refine the existing magnetostratigraphic record. Palaeomagnetic results reveal two short reversed‐polarity subzones within a profile of predominantly normally magnetised sediments, an interpretation that is at variance with previous results from this section and from other studies of Chinese loess. Investigation of sediment mineral‐magnetic properties indicates a close correspondence between down‐section variations in intensity of magnetisation, susceptibility and saturation isothermal Journal of Quaternary Science remanence (SIRM), and lithology. The ratios IRM‐100mT/SIRM and SIRM/ susceptibility appear to be particularly sensitive indicators of the degree of soil development and hence of palaeo
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