气候变化领域集成服务门户(CCPortal): Relationship between magnetic properties and weathering in red soil profiles developed on weakly magnetic parent rock in the tropical and subtropical region of Yunnan, China

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DOI	10.1007/s11600-024-01295-6
	Relationship between magnetic properties and weathering in red soil profiles developed on weakly magnetic parent rock in the tropical and subtropical region of Yunnan, China
	Li, Gangqiang; Zhang, Xiaoling; Li, Haixia; Yang, Tao; Chen, Yudong; Ren, Erhui; Hu, Jingyuan; Wang, Yang
发表日期	2024
ISSN	1895-6572
EISSN	1895-7455
英文摘要	Magnetic studies of loess-paleosol sequences have shown that the magnetic properties of loess and its parent material are sensitive to weathering degree. However, the relationship between magnetic properties and weathering processes in red soils of southern China remains unclear due to the diversity of parent rocks and the influence of climate. This study focused on red soils developed on weakly magnetic sandstone, in tropical and subtropical regions of Yunnan, China. The principal element content, magnetic susceptibility, temperature-dependent susceptibility curve (chi-T curve, where chi represents the magnetic susceptibility at the corresponding temperature during the heating and cooling process of the sample, and T represents the temperature during the heating and cooling process.), hysteresis loop and Isothermal Remanent Magnetization (IRM) of the samples were determined, the weathering characteristics and magnetic properties of profile samples were analyzed, and their relationship was examined, as well as the impact of climate change on fine-grained ferrimagnetic minerals and magnetic properties. The results revealed that red soils developed on weakly magnetic sandstone exhibited significant correlations between three magnetic indices, low-frequency magnetic susceptibility (chi(lf)), frequency-dependent susceptibility (chi(fd)), (chi(post-pre) + chi(d))/chi para, and the silica-sesquioxide ratio (SAF), indicating that these indices can be used to assess soil weathering. Additionally, this study proposed a new index based on the 1 < Log10B(h) < 1.5 mT component obtained from decomposition of the IRM curve, which can also be used to assess soil weathering. The enhancement of magnetic properties in red soils along a single profile was found to be related to the increase in the content of fine-grained ferrimagnetic com-ponents controlled by weathering. Comparing the two climatic regions, it was found that in Yunnan, China, as the climate changes from subtropical humid to tropical humid, the weathering of the red soil profiles becomes stronger, and the fine-grained ferrimagnetic components increase, indirectly enhancing the magnetic properties of red soils.
英文关键词	Red soil; Weathering; Magnetic properties; Climate difference
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001176139700001
来源期刊	ACTA GEOPHYSICA
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/304713
作者单位	Kunming University of Science & Technology; Ministry of Natural Resources of the People's Republic of China
推荐引用方式 GB/T 7714	Li, Gangqiang,Zhang, Xiaoling,Li, Haixia,et al. Relationship between magnetic properties and weathering in red soil profiles developed on weakly magnetic parent rock in the tropical and subtropical region of Yunnan, China[J],2024.
APA	Li, Gangqiang.,Zhang, Xiaoling.,Li, Haixia.,Yang, Tao.,Chen, Yudong.,...&Wang, Yang.(2024).Relationship between magnetic properties and weathering in red soil profiles developed on weakly magnetic parent rock in the tropical and subtropical region of Yunnan, China.ACTA GEOPHYSICA.
MLA	Li, Gangqiang,et al."Relationship between magnetic properties and weathering in red soil profiles developed on weakly magnetic parent rock in the tropical and subtropical region of Yunnan, China".ACTA GEOPHYSICA (2024).