Magnesium isotope fractionation during alkaline brine evaporation and implications for Precambrian seawater chemistry

2021 ◽  
pp. 120565
Author(s):  
Pan Zhang ◽  
Kang-Jun Huang ◽  
Chongguang Luo ◽  
Heng Chen ◽  
Zhian Bao ◽  
...  
Keyword(s):  
Isotope Fractionation ◽  
Seawater Chemistry ◽  
Magnesium Isotope

Magnesium isotope fractionation by chemical diffusion in natural settings and in laboratory analogues

2012 ◽  
Vol 88 ◽  
pp. 1-18 ◽  
Author(s):  
Rahul Chopra ◽  
Frank M. Richter ◽  
E. Bruce Watson ◽  
Christian R. Scullard
Keyword(s):  
Isotope Fractionation ◽  
Chemical Diffusion ◽  
Magnesium Isotope ◽  
Natural Settings

Why magnesium isotope fractionation is absent from basaltic melts under thermal gradients in natural settings

2019 ◽  
Vol 157 (7) ◽  
pp. 1144-1148
Author(s):  
Yingkui Xu ◽  
Dan Zhu ◽  
Xiongyao Li ◽  
Jianzhong Liu
Keyword(s):  
Isotope Fractionation ◽  
Isotope Effects ◽  
Isotopic Fractionation ◽  
Chemical Diffusion ◽  
Kinetic Isotope Effects ◽  
Thermal Gradients ◽  
Magnesium Isotopes ◽  
Magnesium Isotope ◽  
Natural Systems ◽  
Kinetic Isotope

AbstractLaboratory 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.

Magnesium isotope fractionation in silicate melts by chemical and thermal diffusion

2008 ◽  
Vol 72 (1) ◽  
pp. 206-220 ◽  
Author(s):  
Frank M. Richter ◽  
E. Bruce Watson ◽  
Ruslan A. Mendybaev ◽  
Fang-Zhen Teng ◽  
Philip E. Janney
Keyword(s):  
Thermal Diffusion ◽  
Isotope Fractionation ◽  
Silicate Melts ◽  
Magnesium Isotope

Magnesium-Isotope Fractionation During Plant Growth

2008 ◽  
Vol 42 (21) ◽  
pp. 7831-7836 ◽  
Author(s):  
Jay R. Black ◽  
Emanuel Epstein ◽  
William D. Rains ◽  
Qing-zhu Yin ◽  
William H. Casey
Keyword(s):  
Plant Growth ◽  
Isotope Fractionation ◽  
Magnesium Isotope

Experimental determination of magnesium isotope fractionation during higher plant growth

2010 ◽  
Vol 74 (9) ◽  
pp. 2523-2537 ◽  
Author(s):  
Emile B. Bolou-Bi ◽  
Anne Poszwa ◽  
Corinne Leyval ◽  
Nathalie Vigier
Keyword(s):  
Plant Growth ◽  
Experimental Determination ◽  
Isotope Fractionation ◽  
Higher Plant ◽  
Magnesium Isotope
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