Skip Navigation



Journal of Petrology Advance Access published online on April 29, 2005
Journal of Petrology, doi:10.1093/petrology/egi037
This Article
Right arrow FREE Full Text (PDF) Freely available
Right arrow All Versions of this Article:
46/9/1859    most recent
egi037v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by HUDON, P.
Right arrow Articles by BAKER, D. R.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oupjournals.org
Received February 17, 2004
Accepted March 14, 2005

Article

Experimental Investigation and Optimization of Thermodynamic Properties and Phase Diagrams in the Systems CaO-SiO2, MgO-SiO2, CaMgSi2O6-SiO2 and CaMgSi2O6-Mg2SiO4 to 1·0 GPa

PIERRE HUDON 1*, IN-HO JUNG 2, and DON R. BAKER 1

1 DEPARTMENT OF EARTH AND PLANETARY SCIENCES, McGILL UNIVERSITY, 3450 RUE UNIVERSITÉ, MONTRÉAL, QC, H3A 2A7, CANADA
2 CENTRE FOR RESEARCH IN COMPUTATIONAL THERMOCHEMISTRY, ÉCOLE POLYTECHNIQUE DE MONTRÉAL, P.O. BOX 6079, SUCCURSALE CENTRE-VILLE, MONTRÉAL, QC, H3C 3A7, CANADA

* To whom correspondence should be addressed.
PIERRE HUDON, E-mail: pierreh{at}eps.mcgill.ca


  Abstract

Using experimental results at 1·0 GPa for the systems CaO-SiO2, MgO-SiO2, CaMgSi2O6-SiO2 and CaMgSi2O6-Mg2SiO4, and all the currently available phase equilibria and thermodynamic data at 1 bar, we have optimized the thermodynamic properties of the liquid phase at 1·0 GPa. The new optimized thermodynamic parameters indicate that pressure has little effect on the topology of the CaO-SiO2, CaMgSi2O6-SiO2, and CaMgSi2O6-Mg2SiO4 systems but a pronounced one on the MgO-SiO2 binary. The most striking change concerns passage of the MgSiO3 phase from peritectic melting at 1 bar to eutectic melting at 1·0 GPa. This transition is estimated to occur at 0·41 GPa. For the CaMgSi2O6-SiO2 and CaMgSi2O6-Mg2SiO4 pseudo-binaries, the size of the field clinopyroxene + liquid increases with increasing pressure. This change is related to the shift of the piercing points clinopyroxene + silica + liquid (from 0·375 mol fraction SiO2 at 1 bar to 0·414 at 1·0 GPa) and clinopyroxene + olivine + liquid (from 0·191 mol fraction SiO2 at 1 bar to 0·331 at 1·0 GPa) that bound the clinopyroxene + liquid field in the CaMgSi2O6·SiO2 and CaMgSi2O6·Mg2SiO4 pseudo-binaries, respectively.

Keywords: CaO-SiO2; CaMgSi2O6-Mg2SiO4; CaMgSi2O6-SiO2; experiments; MgO-SiO2.
Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.