干旱区生态环境知识资源中心(Arid): Provenance of Fe in Chinese Deserts: Evidence from the geochemistry and mineralogy of soil particles

Arid

DOI	10.1016/j.catena.2020.105053
	Provenance of Fe in Chinese Deserts: Evidence from the geochemistry and mineralogy of soil particles
	He, Tong; Sun, Youbin; Gray, Jessica; Gu, Ying
通讯作者	He, T (corresponding author), Nanjing Univ Informat Sci & Technol, Sch Geog Sci, Nanjing 210044, Peoples R China.
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2021
卷号	198
英文摘要	Determining the categories and content of Fe containing silicate minerals in the desert soils and sediments of northern China is important for understanding the Fe cycle and for correctly interpreting the paleoenvironmental signals from the Loess Plateau downwind. Using a mineral liberation analyzer (MLA), we established the modal mineral abundances of a complete set of Fe containing mineral species in the fine sand to silt fractions of surface samples from Chinese deserts. Results show that the most common discrete particles containing Fe are the silicate phases (similar to 15 wt%), while the weathering product (i.e., Fe oxides) phases are minor and their abundances vary greatly (0.38-4.15 wt%). The degree of weathering has a substantial particle size dependence. The fine fraction (5-20 mu m) generally has a relatively low Fe/Si ratio, possibly due to weathering, while the Fe/Si ratio of the coarse fractions (20-45 mu m, 45-63 mu m, 63-75 mu m, and >75 mu m) are relatively invariant. Abundant Fe is contained within the coarse fractions, which are associated with the local geology. The strong relationship between the Fe and Mg bound within the silicate phases further supports the conclusion that the correlated deviations in the Fe/Si and Mg/Si ratios originate from the provenance bedrock (i.e., siliciclastic, low-grade metamorphic, and possibly high-grade metamorphic, rocks). Since Mg tends to be easily removed during weathering, the Fe/Mg ratios of silicate species largely reflect the weathering intensity. We used the regression equation for the relationship between the local precipitation amount and the Fe/Mg ratios of the soils to produce a novel precipitation proxy. Compared with classical provenance studies conducted using coarse sand and larger rock fragments, the MLA methodology is more applicable to the fine sand and silt fractions; thus, it contributes to the development of weathering and provenance indices based on geochemistry and mineralogy.
英文关键词	Fe provenance Fe speciation Fe/Mg ratio Fe-Mg substitution Precipitation proxy Asian monsoon Desert-loess transitional zone
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:000605337000050
WOS关键词	CHEMICAL-WEATHERING HISTORY ; NORTHERN CHINA ; LOESS PLATEAU ; MA ; EVOLUTION ; DEPOSITS ; SEM ; TEM
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
来源机构	中国科学院地球环境研究所 ; 南京信息工程大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/347784
作者单位	[He, Tong] Nanjing Univ Informat Sci & Technol, Sch Geog Sci, Nanjing 210044, Peoples R China; [Sun, Youbin] Chinese Acad Sci, Inst Earth Environm, Xian 710061, Peoples R China; [Gray, Jessica; Gu, Ying] Queensland Univ, Julius Kruttschnitt Mineral Res Ctr JKMRC, Brisbane, Qld, Australia
推荐引用方式 GB/T 7714	He, Tong,Sun, Youbin,Gray, Jessica,et al. Provenance of Fe in Chinese Deserts: Evidence from the geochemistry and mineralogy of soil particles[J]. 中国科学院地球环境研究所, 南京信息工程大学,2021,198.
APA	He, Tong,Sun, Youbin,Gray, Jessica,&Gu, Ying.(2021).Provenance of Fe in Chinese Deserts: Evidence from the geochemistry and mineralogy of soil particles.CATENA,198.
MLA	He, Tong,et al."Provenance of Fe in Chinese Deserts: Evidence from the geochemistry and mineralogy of soil particles".CATENA 198(2021).