Rock magnetic properties of deserts， gobi and loess topsoils and their implications in models of magnetic susceptibility

doi:10.7522/j.issn.1000-694X.2021.00097

Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (2): 183-193.DOI: 10.7522/j.issn.1000-694X.2021.00097

Rock magnetic properties of deserts， gobi and loess topsoils and their implications in models of magnetic susceptibility

Xuegang Mao¹^,²(), Lijuan Zhao¹()

^1.School of Geographical Sciences /, Fujian Normal University，Fuzhou 350007，China
^2.Institute of Geography, Fujian Normal University，Fuzhou 350007，China

Received:2021-04-21 Revised:2021-07-29 Online:2022-03-20 Published:2022-03-30
Contact: Lijuan Zhao

Abstract

Abstract:

It is widely accepted that the loess on the Chinese Loess Plateau is derived from dust accumulation from the northern or eastern deserts and gobi. In the present study， typical samples of deserts， gobi and loess were collected and measured for rock magnetic measurements， and the mechanism of magnetic susceptibility was discussed as well. The results showed that the deserts and gobi samples were dominated by magnetite of multi domain （MD） and pseudo single domain （SSD） size with no ultrafine magnetic particles formed during pedogensis. The magnetic concentration of deserts and gobi was higher than loess topsoil. The loess topsoil was dominated by magnetite with presence of maghemite. Single domain （SD） and superparamagnetic domain （SP） size formed during pedogensis contributed considerably to the magnetic susceptibility of loess topsoil. Although the concentration of ferrimagnetic minerals was higher in the fine particles than the corresponding coarser ones， the magnetic properties of deserts and gobi samples displayed similarities to coarser particles， because the bulk samples were dominated by coarse particles. The magnetic susceptibility values of deserts， gobi and loess were similar but the critical factors could be different. The critical factor controlling the magnetic susceptibility of deserts and gobi was magnetic content due to high concentration of coarse magnetic particles. The critical factor controlling the magnetic susceptibility was magnetic domain size due to ultrafine particles formed during pedogensis. The pedogenic development and redox states could be used to distinguish pedogensis model and wind-vigour model of magnetic susceptibility. Therefore， the critical factors should be distinguished when interpreting different environments and reconstructing paleoclimate using the magnetic susceptibility.

Key words: loess, magnetic susceptibility, deserts, pedogensis

CLC Number:

Xuegang Mao, Lijuan Zhao. Rock magnetic properties of deserts， gobi and loess topsoils and their implications in models of magnetic susceptibility[J]. Journal of Desert Research, 2022, 42(2): 183-193.

Figures/Tables 9

Fig.1 Study areas and distribution of sampling sites

Fig.2 The particle size distributions of Gobi and loess topsoil. The particle size of deserts is greater than 1 000 μm， not measured using Masters2000

Fig. 3 Room temperature magnetic parameters of deserts， Gobi and loess topsoil. The dashed lines delimit the samples of desert， Gobi and loess. SM1-SM24 are desert samples. GB1-GB10 are Gobi samples. BT1-BT31 are loess samples. Ave. represents mean of magnetic parameters

Fig.4 Dearing plot （χARM/SIRM vs. χfd%） of the desert， Gobi and loess topsoil samples

Fig.5 Thermomagnetic curves of typical desert sample （SM10） and gobi sample （GB4）. The solid line is heating curve and the dashed line is cooling curve. The left panels are for bulk samples， middle panels （<100 μm） for fine subsamples and right panels for coarse （>100 μm） subsamples

Fig.6 Thermomagnetic curves of typical loess topsoil samples （BT1 and BT16）. The solid line is heating curve and dashed line is cooling curve

Fig.7 Hysteresis loops of typical gobi （GB4）， desert （SM10） and loess （BT1） samples. The-S represents fine （<100 μm） subsamples and -B represents coarse （>100 μm） subsamples

Table 1 Hysteretic parameters of typical Gobi （GB4）， desert （SM10） and loess （BT1） samples. The-S represents fine （<100 μm） subsamples and-B represents coarse （>100 μm） subsamples

样品编号	磁化强度 Ms /（10^-3Am²/kg）	剩余磁化强度Mrs /（10^-5Am²/kg）	矫顽力 Bc/mT	剩余矫顽力 Bcr/mT
GB4	1.02	6.68	6.48	37.80
GB4-S	2.42	15.80	7.16	n.a.
GB4-B	0.42	3.00	5.49	n.a.
SM10	0.49	4.41	8.41	49.71
SM10-S	3.00	17.50	5.60	n.a.
SM10-B	0.53	6.31	10.98	n.a.
BT1	0.05	0.66	8.25	43.87

Fig.8 The correlation between magnetic susceptibility and other magnetic parameters

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Rock magnetic properties of deserts， gobi and loess topsoils and their implications in models of magnetic susceptibility

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