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Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions

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Isotope fractionation in silicate melts by thermal diffusion.

F Huang¹, P Chakraborty, C C Lundstrom

¹Department of Geology, University of Illinois, Urbana, Illinois 61801, USA.

|March 19, 2010

Summary

Understanding thermal diffusion (Ludwig-Soret effect) is challenging. This study reveals isotope differences in network modifiers are constant, simplifying characterization of thermal diffusion in complex systems.

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Area of Science:

Geochemistry
Materials Science
Physical Chemistry

Background:

Thermal diffusion, or the Ludwig-Soret effect, describes mass transport driven by temperature gradients.
Characterizing the Soret coefficient, S(T), is difficult due to its high sensitivity to various factors.
Existing models struggle to robustly describe thermal diffusion across diverse compositions and temperatures.

Purpose of the Study:

To develop a simplified and robust framework for characterizing thermal diffusion.
To investigate the behavior of isotopic Soret coefficients in silicate melts.
To explore the applicability of local thermodynamic equilibrium theory to thermal diffusion.

Main Methods:

Experimental analysis of thermal diffusion across a wide range of compositions and temperatures.
Focus on isotopic differences of network-modifying elements (Fe, Ca, Mg).
Development of an additive decomposition model for the Soret coefficient.

Main Results:

The difference in S(T) between isotopes of network modifiers is invariant with composition and temperature.
This invariance allows for a predictable additive decomposition of S(T).
Demonstrated a promising theoretical approach based on local thermodynamic equilibrium.

Conclusions:

A simple and robust framework for characterizing isotope fractionation via thermal diffusion has been established.
The findings are applicable to both natural and synthetic systems.
Local thermodynamic equilibrium offers a viable theoretical basis for understanding thermal diffusion in complex solutions.