The University of Southampton
University of Southampton Institutional Repository

Mechanism of the magnetic susceptibility enhancements of the Chinese loess

Liu, Qingsong, Jackson, Michael J., Banerjee, Subir K., Maher, Barbara A., Deng, Chenglong, Pan, Yongxin and Zhu, Rixiang (2004) Mechanism of the magnetic susceptibility enhancements of the Chinese loess Journal of Geophysical Research, 109, (B12), B12107-[16pp]. (doi:10.1029/2004JB003249).

Record type: Article

Abstract

Chinese loess/paleosol sequences have been regarded as excellent continental archives for encoding continuous paleoclimatic variations over the past 2.5 Myr. However, the mechanism for magnetic enhancements (especially the low-field mass-specific magnetic susceptibility, ?) of Chinese paleosols is still not completely resolved. This study quantifies contributions of aeolian and pedogenic magnetic particles to the bulk magnetic properties of the Chinese loess/paleosols by using a magnetic extraction technique. Magnetic properties of magnetic separates (extractable) and the corresponding residues (nonextractable) for five characteristic samples covering both loesses and paleosols were comprehensively investigated by hysteresis loops, frequency and low-temperature dependence of magnetic susceptibility, and interparametric ratios. Results show that (1) with moderate degrees of pedogenesis (? < 10 × 10?7 m3 kg?1), ? is enhanced more by increased concentration of stable single domain (SD) magnetic particles than by viscous superparamagnetic (SP) particles. For more mature paleosols with ? > (10–12) × 10?7 m3 kg?1, contributions of pedogenically related fine-grained pseudosingle-domain (PSD, ?100 nm to several microns) particles become significant; (2) pedogenic particles have a narrow grain size distribution concentrated above the SP/SD threshold; and (3) anhysteretic remanent magnetization (ARM) is carried dominantly by SD grains. Moreover, we propose that only the nonextractable fraction of ?, saturation magnetization (M s) and remanent magnetization (M rs) show a strong relationship with the degree of pedogenesis. This new interpretation of magnetic enhancements helps us to retrieve more accurate and quantitative paleoclimatic signals recorded by the Chinese loess/paleosol sequences

Full text not available from this repository.

More information

Published date: December 2004
Keywords: chinese loess, magnetic susceptibility, pedogenesis

Identifiers

Local EPrints ID: 41268
URI: http://eprints.soton.ac.uk/id/eprint/41268
ISSN: 0148-0227
PURE UUID: 0a4be722-dcb8-431e-85ef-238872fd6590

Catalogue record

Date deposited: 11 Aug 2006
Last modified: 17 Jul 2017 15:31

Export record

Altmetrics

Contributors

Author: Qingsong Liu
Author: Michael J. Jackson
Author: Subir K. Banerjee
Author: Barbara A. Maher
Author: Chenglong Deng
Author: Yongxin Pan
Author: Rixiang Zhu

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×