Condensation in Dust-enriched Systems, by D.S. Ebel and L. Grossman,
Geochimica et Cosmochimica Acta, 1999

Technique: Thermodynamic Data and Models for Silicate Liquids

A major innovation in the work presented here is the inclusion of the "MELTS" model for silicate liquids (Ghiorso, 1985; Ghiorso and Sack, 1995), which describes the thermodynamic properties of silicate liquids using a regular (symmetric) binary solution model in the components SiO₂-TiO₂ -Al₂O₃-Fe₂O₃-Fe₂SiO₄ -Mg₂SiO₄-MgCr₂O₄-CaSiO₃-Na₂SiO₃ -KAlSiO₄-H₂O, in addition to MnSi_0.5O₂-NiSi_0.5O₂ -CoSi_0.5O₂-Ca₃(PO₄)₂ which have been omitted in the present study. Crystallization calculations with MELTS have been found to yield remarkable agreement between calculated and observed amounts and compositions of phases in liquid-crystal equilibrium experiments at 1 bar (Ghiorso and Carmichael, 1985) and at 10 kbar (Baker et al., 1995; Hirschmann et al., 1998). Ghiorso and Sack (1995) caution against using their model (a) in systems containing only a small subset (<7) of the components, or (b) far outside the temperature-pressure-composition range of its calibration. Both of these caveats are addressed below.

For further details, see:
Test of MELTS: Peridotite KLB-1
Transition Between Liquid Models

CONDENSATION
in
DUST-ENRICHED SYSTEMS

Denton S. Ebel (1)

Lawrence Grossman(1,2)

(1) Department of The Geophysical Sciences
The University of Chicago
5734 South Ellis Ave.
Chicago, IL 60637

(2) Enrico Fermi Institute
The University of Chicago
5640 South Ellis Ave.
Chicago, IL 60637

Submitted December 22, 1998 to

Geochimica et Cosmochimica Acta

Revised version submitted June 30, 1999

Abstract

Introduction
Technique

Bulk Composition

Method of Calculation

Data for Elements and Gas Species

Data and Models for Solids

Data and Models for Silicate Liquids

Test of MELTS: Peridotite KLB-1

Transition Between Liquid Models

Results

Vapor of Solar Composition

General Effects of Dust Enrichment and Total Pressure