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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
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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.
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