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The central Aar Granite; highly differentiated calc-alkaline magmatism in the Aar Massif (Central Alps, Switzerland)

U. Schaltegger
The central Aar Granite; highly differentiated calc-alkaline magmatism in the Aar Massif (Central Alps, Switzerland)
European Journal of Mineralogy (April 1990) 2 (2): 245-259

Abstract

This granite is a calc-alkaline batholith of late Westphalian age which forms the core of the Aar Massif. These highly differentiated rocks, ranging from granodiorite to leucogranite have been studied in three profiles through the massif: the Grimsel, Goscheneralp and Reuss valley cross-sections. The granites have been overprinted by Alpine low-grade metamorphism, but still exhibit primary geochemical compositions: they are characterized by enrichment of the incompatible trace elements Rb, U, Th, Y and Nb and by considerable depletion of Sr, Ba, La, Zr, P and the transition elements during differentiation. The trace element patterns suggest fractional crystallization of plagioclase, K-feldspar, biotite, apatite and allanite, but show some characteristics that cannot be explained by any combination of fractionating minerals. Other processes (mixing assimilation, assimilation-fractional crystallization) may therefore have contributed to the observed trace-element trends. The granites are believed to represent deep-seated crustal melts, which were intruded into the Hercynian orogen after the peak of metamorphism and compressional deformation.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 2
Serial Issue: 2
Title: The central Aar Granite; highly differentiated calc-alkaline magmatism in the Aar Massif (Central Alps, Switzerland)
Author(s): Schaltegger, U.
Affiliation: Univ. Bern, Isotope Geol., CH-3012 Bern, Switzerland
Pages: 245-259
Published: 199004
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 33
Accession Number: 1993-015459
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 9 anals., 2 tables, geol. sketch map
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom. Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe, Hanover, Germany
Update Code: 1993
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