Home // GEOProcessing 2021, The Thirteenth International Conference on Advanced Geographic Information Systems, Applications, and Services // View article
Authors:
Julia Marleen Schmidt
Lena Noack
Keywords: partition coefficients; thermodynamic modelling
Abstract:
Mineral/melt partition coefficients describe the redistribution of trace elements during melting processes. They are highly influenced by changing pressure, temperature, and composition. We find that for sodium, partition coefficients rise in the order of two magnitudes from 0-15 GPa along the peridotite solidus temperature. Still, because of lacking high-pressure experimental data and the limited pressure range of most partitioning models, mantle and crust evolution models normally rely on constant partition coefficients. Based on an earlier model, we created a thermodynamic model which calculates sodium partition coefficients between clinoproxene and anhydrous silicate melts. With the results, we parametrise an equation over 0-15 GPa and various melt fractions. Our new parametrised partitioning model for sodium complements previous models and is applicable up to the mantle transition zone (4-12 GPa/1850-2360 K). Knowing the sodium partitioning behavior enables us to base further calculations for many other elements on it.
Pages: 20 to 27
Copyright: Copyright (c) IARIA, 2021
Publication date: July 18, 2021
Published in: conference
ISSN: 2308-393X
ISBN: 978-1-61208-871-6
Location: Nice, France
Dates: from July 18, 2021 to July 22, 2021