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Evolution of feldspars at the amphibolite-granulite-facies transition in augen gneisses (SW Norway): geochemistry and Sr isotopes

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Abstract

The Sveconorwegian Augen Orthogneisses of Rogaland — Vest-Agder (SW Norway) were emplaced as amphibole- and biotite-bearing granodiorites at 1040 Ma (concordant Rb/Sr and zircon U/Pb ages). They underwent prograde metamorphism which increased from lower amphibolite-facies in the eastern zone to granulite-facies in the western zone, close to the Rogaland anorthosite complex. K-feldspar megacrysts initially crystallised as phenocrysts and were chemically equilibrated during metamorphism, as shown by the flat Ba concentration profiles and the increase of the anorthite content from An1.1 in the amphibolitefacies to An2.6 in the granulite-facies. This increase of the An content suggests an increase in metamorphic temperature. The REE content of the megacrysts is related to the associated accessory minerals which depend upon the metamorphic grade: sphene + allanite + apatite + zircon and rarely thorite in amphibolite-facies, and apatite + zircon + monazite ± thorite in lower amphibolite-and granulite-facies. Amphibole and biotite inclusions in megacrysts were also equilibrated during metamorphism. Groundmass K-feldspar and plagioclase experienced late-metamorphic changes during uplift. An internal Rb/Sr mineral isochron (plagioclase, apatite, K-feldspar) defines an age of 870 Ma, which represents the closure of the Rb/Sr isotopic system in minerals of the augen gneisses. This age also represents a K-feldspar cooling age in regionally distributed augen gneiss samples. The K-feldspar cooling age appears to be similar to or slightly older than the biotite cooling age.

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Author notes

  1. Bernard Bingen (Research assistant of the Belgian National Fund for Scientific Research)

    Present address: Fina Research, 6520, Feluy, Belgium

Authors and Affiliations

  1. Laboratoires associés de Géologie-Pétrologie-Géochronologic (CP 160), Université Libre de Bruxelles, 50 avenue Roosevelt, B-1050, Bruxelles, Belgium

    Bernard Bingen (Research assistant of the Belgian National Fund for Scientific Research) & Daniel Demaiffe

  2. Afdeling Fysico-chemische geologie, University of Leuven, Celestijnenlaan 200c, B-3030, Leuven, Belgium

    Jan Hertogen

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Bingen, B., Demaiffe, D. & Hertogen, J. Evolution of feldspars at the amphibolite-granulite-facies transition in augen gneisses (SW Norway): geochemistry and Sr isotopes. Contr. Mineral. and Petrol. 105, 275–288 (1990). https://doi.org/10.1007/BF00306539

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