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An empirical model for predicting diffusion coefficients in silicate minerals.

S M Fortier, B J Giletti

Science (New York, N.Y.)

|September 29, 1989

Summary

This summary is machine-generated.

An empirical model predicts oxygen diffusion in silicate minerals under hydrothermal conditions. This model accurately estimates diffusion coefficients, crucial for understanding geological processes.

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Area of Science:

Geochemistry
Mineral Physics

Background:

Diffusion kinetics are critical for understanding mineral alteration and element transport in geological systems.
Previous models often lacked empirical validation under specific hydrothermal conditions.

Purpose of the Study:

To establish an empirical model for oxygen diffusion kinetics in silicate minerals.
To validate the model's predictive capability under hydrothermal conditions.

Main Methods:

Development of an empirical equation based on experimental data.
Testing the model across a temperature range of 773-1073 K and 100 MPa water pressure.

Main Results:

An established model: log D = alpha + (beta/T) + [(gamma + (delta/T))Z].
The model predicts diffusion coefficients within a factor of 2 reproducibility for oxygen diffusion.
Preliminary data suggest applicability to argon diffusion in silicates.

Conclusions:

The developed empirical model provides a reliable tool for predicting oxygen diffusion in silicates.
The model's accuracy is within experimental limits, enhancing its practical utility.
Potential extension of the model to other diffusing species like argon is indicated.