Rock magnetic properties of deserts， gobi and loess topsoils and their implications in models of magnetic susceptibility
Received date: 2021-04-21
Revised date: 2021-07-29
Online published: 2022-03-30
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
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 . DOI: 10.7522/j.issn.1000-694X.2021.00097
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