Theoretical phase relations involving cordierite and garnet revisited: the influence of oxygen fugacity on the stability of sapphirine and spinel ... View Full Text


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Article Info

DATE

1986-09

AUTHORS

B. J. Hensen

ABSTRACT

The theoreticalP-T grid for stability relations of the phases cordierite (Cd), sapphirine (Sa), hypersthene (Hy), garnet (Ga), spinel (Sp), sillimanite (Si), and quartz (Qz) of Hensen (1971), has proved useful in the interpretation of metamorphic mineral assemblages formed at low oxygen fugacity. Both experimental data and evidence from natural rocks indicate that at high oxygen fugacity compatability relations change as a result of the enlargement of the stability field of spinel, which causes a topological inversion and the stabilisation of the invariant points [Sa], [Ga], and [Cd]. This implies the stable existence of the univariant equilibria (for\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $$f_{{\text{O}}_{\text{2}} } $$ \end{document} buffered conditions): Sp+Qz=Ga+Hy+Si+O2 (Sa, Cd), Cd+Sp+Qz=Hy+Si+O2 (Sa, Ga) and Sa+Sp+Qz=Hy+Si+O2 (Ga, Cd) and the divariant reaction: Sp+Qz=Hy+Si+O2 (Sa, Ga, Cd). These redox equilibria are restricted to conditions of high oxygen fugacity. The proposed theoreticalP-T grids, for both low and high oxygen fugacity, satisfactorily explain all experimental data and metamorphic mineral assemblages so far found in granulites. More... »

PAGES

362-367

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00572165

DOI

http://dx.doi.org/10.1007/bf00572165

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1009239489


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