Effects of low-temperature oxidation on natural remanent magnetization of Chinese loess

Qingsong Liu; S. K. Banerjee; M. J. Jackson; Rixiang Zhu; Yongxin Pan

doi:10.1360/02tb9456

Effects of low-temperature oxidation on natural remanent magnetization of Chinese loess

Qingsong Liu, S. K. Banerjee, M. J. Jackson, Rixiang Zhu, Yongxin Pan

Earth and Environmental Sciences-Twin Cities

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Abstract

This study systematically investigates changes in both compositions and grain-sizes of magnetic minerals in the Chinese loess/paleosol samples (Yichuan, China) during thermal demagnetization processes. Between 100 and 200°C, (1) H_c and H_cr significantly decrease while M_rs and M_s remain stable; (2) concentration of the multi-domain (MD) grains increases while that of superparamagnetic (SP) grains decreases; and (3) there exists the abnormal behavior of the thermal demagnetization in the natural remanent magnetization (NRM). In addition, the corresponding changes in all these parameters are gradually muted with the increase of the pedogenesis degree. The results indicate that the observed alteration probably relates to reducing processes caused by the burning of the organic matter in samples. Before the thermal treatment, the MD grains in loess samples had been partially altered in nature by low-temperature oxidization (LTO). This CRM can be sufficiently attenuated or even removed by the reducing process between 100 and 200°C during the thermal treatment and has no apparent harmful effects on the characteristic remanent magnetization (ChRM) between 300 and 500°C.

Original language	English (US)
Pages (from-to)	2100-2105
Number of pages	6
Journal	Chinese Science Bulletin
Volume	47
Issue number	24
DOIs	https://doi.org/10.1360/02tb9456
State	Published - Dec 2002

Bibliographical note

Funding Information:
Acknowledgements We thank Guo Bin for helping to collect samples. This work was supported by NSF (Grant Nos. EAR 0003421 and EAR/IF 9818704) and the National Natural Science Foundation of China (Grant No. 49834001). All the measurements were performed at the Institute for Rock Magnetism, which is funded by the Keck Foundation, the US National Science Foundation, and the University of Minnesota. References 1. Liu, T. S. et al., Loess and the Environment, Beijing: China Ocean

Keywords

Chemical remanent magnetization
Chinese loess
Low-temperature oxidation
Natural remanent magnetization
Verwey transition

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title = "Effects of low-temperature oxidation on natural remanent magnetization of Chinese loess",

abstract = "This study systematically investigates changes in both compositions and grain-sizes of magnetic minerals in the Chinese loess/paleosol samples (Yichuan, China) during thermal demagnetization processes. Between 100 and 200°C, (1) Hc and Hcr significantly decrease while Mrs and Ms remain stable; (2) concentration of the multi-domain (MD) grains increases while that of superparamagnetic (SP) grains decreases; and (3) there exists the abnormal behavior of the thermal demagnetization in the natural remanent magnetization (NRM). In addition, the corresponding changes in all these parameters are gradually muted with the increase of the pedogenesis degree. The results indicate that the observed alteration probably relates to reducing processes caused by the burning of the organic matter in samples. Before the thermal treatment, the MD grains in loess samples had been partially altered in nature by low-temperature oxidization (LTO). This CRM can be sufficiently attenuated or even removed by the reducing process between 100 and 200°C during the thermal treatment and has no apparent harmful effects on the characteristic remanent magnetization (ChRM) between 300 and 500°C.",

keywords = "Chemical remanent magnetization, Chinese loess, Low-temperature oxidation, Natural remanent magnetization, Verwey transition",

author = "Qingsong Liu and Banerjee, {S. K.} and Jackson, {M. J.} and Rixiang Zhu and Yongxin Pan",

note = "Funding Information: Acknowledgements We thank Guo Bin for helping to collect samples. This work was supported by NSF (Grant Nos. EAR 0003421 and EAR/IF 9818704) and the National Natural Science Foundation of China (Grant No. 49834001). All the measurements were performed at the Institute for Rock Magnetism, which is funded by the Keck Foundation, the US National Science Foundation, and the University of Minnesota. References 1. Liu, T. S. et al., Loess and the Environment, Beijing: China Ocean",

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AU - Pan, Yongxin

N1 - Funding Information: Acknowledgements We thank Guo Bin for helping to collect samples. This work was supported by NSF (Grant Nos. EAR 0003421 and EAR/IF 9818704) and the National Natural Science Foundation of China (Grant No. 49834001). All the measurements were performed at the Institute for Rock Magnetism, which is funded by the Keck Foundation, the US National Science Foundation, and the University of Minnesota. References 1. Liu, T. S. et al., Loess and the Environment, Beijing: China Ocean

PY - 2002/12

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N2 - This study systematically investigates changes in both compositions and grain-sizes of magnetic minerals in the Chinese loess/paleosol samples (Yichuan, China) during thermal demagnetization processes. Between 100 and 200°C, (1) Hc and Hcr significantly decrease while Mrs and Ms remain stable; (2) concentration of the multi-domain (MD) grains increases while that of superparamagnetic (SP) grains decreases; and (3) there exists the abnormal behavior of the thermal demagnetization in the natural remanent magnetization (NRM). In addition, the corresponding changes in all these parameters are gradually muted with the increase of the pedogenesis degree. The results indicate that the observed alteration probably relates to reducing processes caused by the burning of the organic matter in samples. Before the thermal treatment, the MD grains in loess samples had been partially altered in nature by low-temperature oxidization (LTO). This CRM can be sufficiently attenuated or even removed by the reducing process between 100 and 200°C during the thermal treatment and has no apparent harmful effects on the characteristic remanent magnetization (ChRM) between 300 and 500°C.

AB - This study systematically investigates changes in both compositions and grain-sizes of magnetic minerals in the Chinese loess/paleosol samples (Yichuan, China) during thermal demagnetization processes. Between 100 and 200°C, (1) Hc and Hcr significantly decrease while Mrs and Ms remain stable; (2) concentration of the multi-domain (MD) grains increases while that of superparamagnetic (SP) grains decreases; and (3) there exists the abnormal behavior of the thermal demagnetization in the natural remanent magnetization (NRM). In addition, the corresponding changes in all these parameters are gradually muted with the increase of the pedogenesis degree. The results indicate that the observed alteration probably relates to reducing processes caused by the burning of the organic matter in samples. Before the thermal treatment, the MD grains in loess samples had been partially altered in nature by low-temperature oxidization (LTO). This CRM can be sufficiently attenuated or even removed by the reducing process between 100 and 200°C during the thermal treatment and has no apparent harmful effects on the characteristic remanent magnetization (ChRM) between 300 and 500°C.

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KW - Natural remanent magnetization

KW - Verwey transition

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Effects of low-temperature oxidation on natural remanent magnetization of Chinese loess

Abstract

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Keywords

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