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Fluids of anorogenic granites: A preliminary assessment

Fluida von anorogenen Graniten: Eine erste, abschätzende Studie

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Summary

Anorogenic granites are principally associated with alkaline ring complexes or anorthositic suites. Compositional relationships in the granites may be largely the result of variable compositions of fluid phases present during the initial melting and/or later evolution. For example, the negative K2O-SiO2 relationships in granites associated with alkaline rocks is consistent with: (1) evolution of the initial melts in a CO2-rich environment, which causes the product of incongruent melting of biotite to be a prominent component of the derived magmas; and/or (2) crystallization of the granites in a CO2-rich environment, which causes a residual liquid to be rich in biotite component. Limited evidence indicates that granites evolved in fluorine-rich environments are enriched in Na and may have negative relationships between Na2O and SiO2. Fluorine-rich environments may be more characteristic of the silicic rocks in rapakivi-granit e/anorthosite complexes than of granites in alkaline suites.

Zusammenfassung

Anorogene Granite sind prinzipiell mit alkalischen Ringkomplexen oder AnorthositSerien assoziiert. Die spezielle Zusammensetzung dieser Granite resultiert vermutlich hauptsächlich aus der variablen Zusammensetzung der während des initialen Schmelzprozesses und/oder späteren magmatischen Evolution vorhandenen fluiden Phase. Zum Beispiel geht die negative Korrelation zwischen K2O und SiO2 in Graniten, die mit alkalinen Gesteinen assoziiert sind, konform mit 1) der Entwicklung der Initialschmelze in einem CO2-reichen Milieu, wodurch das Produkt des inkongruenten Schmelzens von Biotit als Komponente im Magma dominiert, und/oder 2) der Kristallisation der Granite in einem CO2-reichen Milieu, das wiederum eine biotitreiche Residualschmelze hervorruft. Limitierte Hinweise deuten an, daß Granite, die in einem fluorreichen Milieuentstehen, an Na angereichert sind und eine negative Korrelation zwischen Na2O und SiO2 zeigen. Fluorreiches Milieu ist vermutlich für die sauren Gesteine innerhalb von Rapakivi-Granit/Anorthosit-Komplexen eher charakteristisch als für Granite in alkalischen Serien.

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  1. Department of Geology CB# 3315, University of North Carolina, NC 27599-3315, Chapel Hill, USA

    J. J. W. Rogers & M. E. Satterfield

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Rogers, J.J.W., Satterfield, M.E. Fluids of anorogenic granites: A preliminary assessment. Mineralogy and Petrology 50, 157–171 (1994). https://doi.org/10.1007/BF01160145

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