Analysis of equilibrium in garnet-biotite-sillimanite gneisses from quebec

Kretz R. (1964) Analysis of equilibrium in garnet-biotite-sillimanite gneisses from quebec. Journal of Petrology, 5 1: 1-20. doi:10.1093/petrology/5.1.1


Author Kretz R.
Title Analysis of equilibrium in garnet-biotite-sillimanite gneisses from quebec
Journal name Journal of Petrology   Check publisher's open access policy
ISSN 0022-3530
Publication date 1964-01-01
Sub-type Article (original research)
DOI 10.1093/petrology/5.1.1
Volume 5
Issue 1
Start page 1
End page 20
Total pages 20
Subject 1312 Molecular Biology
2613 Statistics and Probability
2605 Computational Mathematics
1706 Computer Science Applications
1703 Computational Theory and Mathematics
1908 Geophysics
1906 Geochemistry and Petrology
Abstract An analysis is presented of equilibrium in six specimens of garnet-biotite-sillimanite-plagioclase-potash feldspar-quartz ... gneiss from a metamorphic terrain in south-western Quebec.A nearly uniform Ti content of biotite may be accounted for by an equilibrium (a) involving biotite, sillimanite, quartz, garnet, potash feldspar, and H 2O. The nature of the distribution of Fe and Mg between garnet and biotite may be accounted for by another equilibrium (b) involving the same mineral suite, or by a simple exchange equilibrium (c) involving only garnet and biotite. The distribution of Mn between garnet and biotite is accounted for by an exchange equilibrium (d). A nearly uniform value of the ratio Ca content of plagioclase/Ca content of garnet may be accounted for by an equilibrium (e) involving plagioclase, garnet, sillimanite, and quartz. A proposed equilibrium (f) involving biotite, quartz, ilmenite, potash feldspar, sillimanite, and H 2O conflicts with equilibrium (a) and was evidently not established in the gneisses. The factors governing the Ca content of biotite remain largely unknown.Some of these equilibria form potential indicators of relative geologic temperature, pressure, and chemical potential of H 2O.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Tue, 28 Jun 2016, 11:21:11 EST by System User