Knowledge Management System Of Institute of Geochemistry,CAS
Why magnesium isotope fractionation is absent from basaltic melts under thermal gradients in natural settings | |
Yingkui Xu; Dan Zhu; Xiongyao Li; Jianzhong Liu | |
2020 | |
发表期刊 | Geological Magazine |
页码 | 1144 - 1148 |
摘要 | Laboratory experiments have shown that thermal gradients in silicate melts can lead to isotopic fractionation; this is known as the Richter effect. However, it is perplexing that the Richter effect has not been documented in natural samples as thermal gradients commonly exist within natural igneous systems. To resolve this discrepancy, theoretical analysis and calculations were undertaken. We found that the Richter effect, commonly seen in experiments with wholly molten silicates, cannot be applied to natural systems because natural igneous samples are more likely to be formed out of partially molten magma and the presence of minerals adds complexity to the behaviour of the isotope. In this study, we consider two related diffusion-rate kinetic isotope effects that originate from chemical diffusion, which are absent from experiments with wholly molten samples. We performed detailed calculations for magnesium isotopes, and the results indicated that the Richter effect for magnesium isotopes is buffered by kinetic isotope effects and the total value of magnesium isotope fractionation can be zero or even undetectable. Our study provides a new understanding of isotopic behaviour during the processes of cooling and solidification in natural magmatic systems. |
关键词 | Magnesium Isotope Thermal Gradient Richter Effect Soret Effect |
收录类别 | SCI |
语种 | 英语 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gyig.ac.cn/handle/42920512-1/10626 |
专题 | 月球与行星科学研究中心 |
作者单位 | 1.Center for Lunar and Planetary Sciences, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China 2.CAS Center for Excellence in Comparative Planetology, Hefei 230026, China 3.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China |
推荐引用方式 GB/T 7714 | Yingkui Xu;Dan Zhu;Xiongyao Li;Jianzhong Liu. Why magnesium isotope fractionation is absent from basaltic melts under thermal gradients in natural settings[J]. Geological Magazine,2020:1144 - 1148. |
APA | Yingkui Xu;Dan Zhu;Xiongyao Li;Jianzhong Liu.(2020).Why magnesium isotope fractionation is absent from basaltic melts under thermal gradients in natural settings.Geological Magazine,1144 - 1148. |
MLA | Yingkui Xu;Dan Zhu;Xiongyao Li;Jianzhong Liu."Why magnesium isotope fractionation is absent from basaltic melts under thermal gradients in natural settings".Geological Magazine (2020):1144 - 1148. |
条目包含的文件 | ||||||
文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
Why magnesium isotop(278KB) | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论