首页|Fe-Mn interdiffusion in aluminosilicate garnets
Fe-Mn interdiffusion in aluminosilicate garnets
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Precise determination of cation diffusivity in garnet can provide critical information for quantitatively understanding the timescales and thermodynamics of various geological processes,but very few studies have been performed for Fe-Mn interdiffusion.In this study,Fe-Mn interdiffusion rates in natural single crystals of Mn-bearing garnet with 750 ppm H2O are determined at 6 GPa and 1273-1573 K in a Kawai-type multi-anvil apparatus.Diffusion profiles were acquired by electron microprobe and fitted using Boltzmann-Matano equation.The experimental results show that the Fe-Mn interdiffusion coefficient(DFe-Mn)slightly decreases with increasing XFe.The experimentally determined DFe-Mn in Mn-bearing garnet can be fitted by the Arrhenius equation:DFe_Mn(m2/s)=D0XFenexp(-E*/RT),where E*=(1-XFe)EMn+XFeE*Fe,D0=8.06-6.04+9.87× 10-9 m2/s,EMn=248±27 kj/mol,EFe=226±59 kJ/mol,n=-1.36±0.51.The comparing the present results with previous experimental data suggest that water can greatly enhance the DFe-Mn in garnet.Our results indicate that the time required for homogenization of the compositional zoning of a garnet is much shorter than previously thought.
Key Laboratory of High-temperature and High-pressure Study of the Earth's Interior,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,Guizhou,China
University of Chinese Academy of Sciences,Beijing 100049,China
Key Laboratory of Big Data in Geosciences and Deep Earth Resources of Zhejiang Province,School of Earth Sciences,Zhejiang University,Hangzhou 310058,China
国家自然科学基金国家自然科学基金Key Research Program of Frontier Sciences of CAS中央高校基本科研业务费专项
NETL
NSTL
万方数据
维普
