Magnetic properties of Holocene aeolian sand and lacustrine sediments from the Salawusu River Basin

doi:10.7522/j.issn.1000-694X.2023.00078

Journal of Desert Research ›› 2024, Vol. 44 ›› Issue (1): 75-85.DOI: 10.7522/j.issn.1000-694X.2023.00078

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Magnetic properties of Holocene aeolian sand and lacustrine sediments from the Salawusu River Basin

Lü Kexin¹(), Shuang Zhao¹(), Wenchang Zhang¹, Dunsheng Xia²

^1.Key Laboratory of Terrestrial Ecological Remediation in Jining City / School of Geography and Tourism，Qufu Normal University，Rizhao 276826，Shandong，China
^2.Key Laboratory of Western China's Environmental Systems （Ministry of Education），Lanzhou University，Lanzhou 730000，China

Received:2023-03-16 Revised:2023-05-20 Online:2024-01-20 Published:2023-12-26
Contact: Shuang Zhao

Abstract

Abstract:

Magnetic susceptibility is a commonly used proxy for paleoenvironmental research. However， the magnetic enhancement mechanism of sediments from different sedimentary environments is different， so the systematic magnetic study is particularly important for the interpretation of the paleoenvironmental significance of magnetic susceptibility. In this study， we selected the Holocene aeolian sand and lacustrine sedimentation section of Dishaogouwan from the Salawusu River Basin to clarify the magnetic properties of different sedimentary facies and explore their variation mechanisms through systematic study of environmental magnetic parameters. The results show that the magnetic properties of aeolian sand and lacustrine sediments are significantly different. The magnetic minerals in aeolian sand are mainly ferrimagnetic magnetite and maghemite， with lower coercivity， higher magnetic minerals concentration， and coarser magnetic grain size， mainly multi-domains and pseudo-single domains. In addition to ferromagnetic and antiferromagnetic minerals， lacustrine sediments may also contain weakly magnetic iron sulfides， with higher coercivity， lower concentration of magnetic minerals， and finer magnetic grain size， mainly coarse stable single domains. Magnetic susceptibility of aeolian sand are less influenced by pedogenesis and are mainly influenced by the “dust input mode”， with the dominant contribution of coarse-grained magnetite and maghemite to the magnetic susceptibility. The magnetic characteristics of the lacustrine sediments are influenced by the reducing environment of the lake， where the strongly magnetic iron oxides undergo dissolution and conversion to the weakly magnetic iron sulfides， resulting in a decrease in the magnetic grain size， a decrease in the magnetic mineral concentration and an increase in the coercivity.

Key words: aeolian sand, lacustrine sediments, magnetic properties, Salawusu River Basin

CLC Number:

P539.3

Lü Kexin, Shuang Zhao, Wenchang Zhang, Dunsheng Xia. Magnetic properties of Holocene aeolian sand and lacustrine sediments from the Salawusu River Basin[J]. Journal of Desert Research, 2024, 44(1): 75-85.

Figures/Tables 10

Fig.1 Geographical map and photo of the Dishaogouwan section

Table 1 The stratigraphic characteristics of Dishaogouwan section

分层	深度/cm	地层特征
DS1	0~70	风成砂。淡黄色细砂，质地疏松，分选较好，偶见植物根系
DS2	70~120	湖泊相。青灰色粉砂质细砂，结构紧实，质地较硬，含根孔
DS3	120~170	沼泽相。灰黑色黏土质细砂，结构紧实，质地较硬
DS4	170~250	湖泊相夹有风成砂。青灰色粉砂质细砂夹杂黄色细砂，分选较差，底部可见冻融褶皱
DS5	250~330	风成砂。淡黄色细砂，质地较疏松，分选较好，有近似水平层理

Table 2 OSL age of the Dishaogouwan section

实验室编号	埋深/m	U/（mg·kg^-1）	Th/（mg·kg^-1）	K/%	年剂量/（Gy·ka^-1）	等效剂量/Gy	年龄/ka
Lzu1122	2.6	1.91±0.09	5.2±0.19	1.45±0.05	2.49±0.14	20.98±1.52	8.43±0.77

Fig.2 κ-T curves of typical samples for the Dishaogouwan section

Fig.3 IRM acquisition curves （A） and backfield curves （B） for selected samples of the Dishaogouwan section

Fig.4 Variations of χlf， χARM， SIRM， Soft and HIRM with depth

Fig.5 Variations of χfd%， χARM/χlf and χARM/SIRM with depth

Fig.6 King plots and Dearing plots of magnetic parameters in the Dishaogouwan section

Fig.7 Scatter plots of χlf versus SIRM， Soft， and SIRM versus Soft

Fig.8 Scatter plots of χlf versus χfd%， χARM/SIRM and χARM/χlf

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Magnetic properties of Holocene aeolian sand and lacustrine sediments from the Salawusu River Basin

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