| Provenance of Fe in Chinese Deserts: Evidence from the geochemistry and mineralogy of soil particles | |
| He, Tong1; Sun, Youbin2; Gray, Jessica3; Gu, Ying3 | |
| 通讯作者 | He, Tong(hetong@nuist.edu.cn) |
| 2021-03-01 | |
| 发表期刊 | CATENA
 |
| ISSN | 0341-8162 |
| 卷号 | 198页码:9 |
| 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. |
| 关键词 | Fe provenance Fe speciation Fe/Mg ratio Fe-Mg substitution Precipitation proxy Asian monsoon Desert-loess transitional zone |
| DOI | 10.1016/j.catena.2020.105053 |
| 关键词[WOS] | CHEMICAL-WEATHERING HISTORY ; NORTHERN CHINA ; LOESS PLATEAU ; MA ; EVOLUTION ; DEPOSITS ; SEM ; TEM |
| 收录类别 | SCI ; SCI |
| 语种 | 英语 |
| 资助项目 | National Science Foundation of China[41877284] ; National Science Foundation of China[41303071] |
| WOS研究方向 | Geology ; Agriculture ; Water Resources |
| 项目资助者 | National Science Foundation of China |
| WOS类目 | Geosciences, Multidisciplinary ; Soil Science ; Water Resources |
| WOS记录号 | WOS:000605337000050 |
| 出版者 | ELSEVIER |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ieecas.cn/handle/361006/15889 |
| 专题 | 古环境研究室 |
| 通讯作者 | He, Tong |
| 作者单位 | 1.Nanjing Univ Informat Sci & Technol, Sch Geog Sci, Nanjing 210044, Peoples R China 2.Chinese Acad Sci, Inst Earth Environm, Xian 710061, Peoples R China 3.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]. CATENA,2021,198:9. |
| 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,198,9. |
| MLA | He, Tong,et al."Provenance of Fe in Chinese Deserts: Evidence from the geochemistry and mineralogy of soil particles".CATENA 198(2021):9. |
| 条目包含的文件 | 条目无相关文件。 | |||||
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