| Lithium isotopic composition of soil pore water: Responses to evapotranspiration | |
| Xu, Zhewen1; Li, Tao1; Li, Gaojun1,2,3; Hedding, David W.4; Wang, Yunqiang5; Gou, Long-Fei3; Zhao, Liang1; Chen, Jun1 | |
| 通讯作者 | Li, Gaojun(ligaojun@nju.edu.cn) |
| 2022-02-01 | |
| 发表期刊 | GEOLOGY
 |
| ISSN | 0091-7613 |
| 卷号 | 50期号:2页码:194-198 |
| 摘要 | Lithium isotopes show great potential to trace Earth surface processes due to the large mass discrimination between Li-6 and Li-7 associated with clay uptake. However, factors controlling the Li isotopic composition (delta Li-7) of river water, especially those with a water-bedrock delta Li-7 difference higher than that of the equilibrium fractionation associated with clay formation (Delta(W-C)), have not yet been fully resolved. Traditional interpretation involves the Rayleigh distillation, but it unrealistically separates the stage of clay formation from that of silicate dissolution using fractionation factors that are much lower than laboratories can constrain. We propose an in situ mechanism that simulates high delta Li-7 by evapotranspiration. A model with coupled mineral dissolution and clay precipitation shows that evaporative enrichment of pore-water Li progressively increases the incorporation of Li into clays with light delta Li-7, resulting in higher delta Li-7 values in the residual water than Delta(W-C). We also provide evidence from the Chinese Loess Plateau, where an evaporative effect readily explains the observed delta Li-7. The influence of evapotranspiration on riverine delta Li-7 implies that changes in aridity may partly explain the variations of seawater delta Li-7. The same principle may also apply to other stable isotopic systems whereby incorporation into secondary precipitates controls the isotopic fractionation. |
| DOI | 10.1130/G49366.1 |
| 关键词[WOS] | WEATHERING PROCESSES ; LI ; FRACTIONATION ; BEHAVIOR ; RIVERS ; LOESS ; CYCLE |
| 收录类别 | SCI ; SCI |
| 语种 | 英语 |
| 资助项目 | National Natural Science Foundation of China[41991321] ; National Natural Science Foundation of China[41877351] ; National Natural Science Foundation of China[41730101] ; National Natural Science Foundation of China[42061130212] ; National Natural Science Foundation of China[42002198] ; Royal Society Newton Advanced Fellowship[NA201244] ; Fundamental Research Funds for the Central Universities[0206-14380124] ; Second Tibetan Plateau Scientific Expedition and Research program[2019QZKK0707] |
| WOS研究方向 | Geology |
| 项目资助者 | National Natural Science Foundation of China ; Royal Society Newton Advanced Fellowship ; Fundamental Research Funds for the Central Universities ; Second Tibetan Plateau Scientific Expedition and Research program |
| WOS类目 | Geology |
| WOS记录号 | WOS:000749789600013 |
| 出版者 | GEOLOGICAL SOC AMER, INC |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ieecas.cn/handle/361006/17414 |
| 专题 | 生态环境研究室 |
| 通讯作者 | Li, Gaojun |
| 作者单位 | 1.Nanjing Univ, Dept Earth & Planetary Sci, Minist Educ, Key Lab Surficial Geochem, Nanjing 210023, Peoples R China 2.Nanjing Univ, Frontiers Sci Ctr Crit Earth Mat Cycling, Nanjing 210023, Peoples R China 3.Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610059, Sichuan, Peoples R China 4.Univ South Africa, Dept Geog, ZA-1710 Florida, South Africa 5.Chinese Acad Sci, Inst Earth Environm, SKLLQG, Xian 710061, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu, Zhewen,Li, Tao,Li, Gaojun,et al. Lithium isotopic composition of soil pore water: Responses to evapotranspiration[J]. GEOLOGY,2022,50(2):194-198. |
| APA | Xu, Zhewen.,Li, Tao.,Li, Gaojun.,Hedding, David W..,Wang, Yunqiang.,...&Chen, Jun.(2022).Lithium isotopic composition of soil pore water: Responses to evapotranspiration.GEOLOGY,50(2),194-198. |
| MLA | Xu, Zhewen,et al."Lithium isotopic composition of soil pore water: Responses to evapotranspiration".GEOLOGY 50.2(2022):194-198. |
| 条目包含的文件 | 条目无相关文件。 | |||||
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