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Peraluminous granites; the effect of alumina on melt composition and coexisting minerals

Francois Holtz, Wilhelm Johannes and Michel Pichavant
Peraluminous granites; the effect of alumina on melt composition and coexisting minerals (in The second Hutton symposium on the origin of granites and related rocks; proceedings, P. E. Brown (editor) and B. W. Chappell (editor))
Special Paper - Geological Society of America (1992) 272: 409-416

Abstract

Phase relationships in the Q-Or-Ab-Al (sub 2) O (sub 3) system and the solubility of elements like Mg and P are dependent on the Al content of the melt. At 2 kbar, liquidus surfaces in this system saturated with respect to sillimanite or mullite are shifted towards the Q apex, thus lowering the liquidus T in the quartz primary field by 40-55 degrees C and producing a slight shift of the minimum composition when compared to the subaluminous Q-Or-Ab system. The lowering of the liquidus T for all cotectic compositions may partly be explained by the slightly higher H (sub 2) O solubility observed in peraluminous melts at 2 kbar. The higher H (sub 2) O solubility in peraluminous melts may also lower the viscosity of such melts and enhance the emplacement of peraluminous granites as small bodies. The incorporation of Mg and P is enhanced by high Al contents of the melt, and this may influence the composition, amount and nature of the minerals (biotite, cordierite, apatite) crystallizing from granite melts.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 272
Title: Peraluminous granites; the effect of alumina on melt composition and coexisting minerals
Title: The second Hutton symposium on the origin of granites and related rocks; proceedings
Author(s): Holtz, FrancoisJohannes, WilhelmPichavant, Michel
Author(s): Brown, P. E.editor
Author(s): Chappell, B. W.editor
Affiliation: Universitat Hannover, Institut fur Mineralogie, Hanover, Federal Republic of Germany
Affiliation: University of St. Andrews, Department of Geology, St. Andrews, United Kingdom
Pages: 409-416
Published: 1992
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 0-8137-2272-1
Meeting name: The second Hutton symposium on the Origin of granites and related rocks
Meeting location: Canberra, AUS, Australia
Meeting date: 19910923Sept. 23-28, 1991
References: 50
Accession Number: 1993-010091
Categories: Igneous and metamorphic petrology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Annotation: Originally publ. in Transact. R. Soc. Edinburgh, Earth Sci., Vol. 83, parts 1 and 2
Illustration Description: illus. incl. 4 tables
Secondary Affiliation: Australian National University, AUS, AustraliaCRSCM-CNRS, FRA, France
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 1993
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