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A garnet-cordierite granite porphyry containing rapakivi feldspars in the Cabeza de Araya batholith (extremadura, spanish Hercynian belt)

Eine Rapakivi-Feldspat führender Granat-Codierit-Granitporphyr aus dem Cabeza de Araya Batholith (Extremadura, Hereynischer Gürtel, Spanien)

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Summary

The garnet-cordierite granite porphyry is a large dyke associated with the Cabeza Araya batholith. The batholith shows “S” typology but with intermediate characteristics between the aluminous granite series, spatially and genetically related to the Hercynian regional metamorphism, and the calc-alkaline series of the Iberian massif. The granite porphyry is rich in megacrystic alkali feldspar often with rapakivi texture. Its mineralogy consists mainly of quartz + plagioclase + alkali feldspar + biotite I + cordierite I + garnet + biotite 11 + cordierite II ± muscovite + chlorite.

Cordierite-garnet thermobarometry and stability relationships of ternary feldspars are used to estimate the T-P conditions of crystallization and the evolution of these rocks. The equilibrium temperature obtained from the cordierite-garnet pair is about 800°C (4 ± 0.5 Kb). This shows the xenocrystic origin of cordierite and garnet, in accordance with other geological and textural evidence. Garnet transformation, the genesis of Cordierite II and the formation of mantled textures are interpreted as the result of an isothermal decompression accompanying the emplacement of the porphyry.

Zusammenfassung

Der Granat-Cordierit-Granit stellt einen mit dem Cabeza Araya Batholith assoziierten, mächtigen Gang dar. Der Batholith zeigt S-Typ Charakter, jedoch mit Čbergangsmerkmalen zu aluminösen Granitserien, und steht räumlich und genetisch im Zusammenhang mit der hercynischen Regionalmetamorphose und den Kalkalkaliserien des iberischen Massivs. Der Granitporphyr führt häufig Megakristalle von Alkalifeldspat, die oft Rapakivitextur zeigen. Die Mineralogie des Granitporphyr besteht aus Quarz + Plagioklas + Alkalifeldspat + Biotit 1 + Cordierit 1 + Granat + Biotit II + Cordierit II ± Muscovit ± Chlorit. Die P-T Bedingungen der Kristallisation und die magmatische Entwicklung dieser

Die wurde, P-T Bedingungen der Kristallisation und die magmatische Entwicklung dieser Gesteine wurde, unter Anwendung der Cordierit-Granat Thermobarometrie und den Stabilitätsbeziehungen der Feldspäte, ermittelt. Die Gleichgewichtstemperatur aus Cordierit-Granat-Paaren beträgt um 800°C (4 ± 0.5 Kb). Dies zeigt die Bildung von Cordierit und Granat als Xenokristalle, in Übereinstimmung mit anderen geologischen und texturellen Merkmalen. Die Transformation des Granat. die Genese von Cordierit II und das Entstehen von “mantled” Texturen, kann als Resultat einer isothermalen Dekompression interpretiert werden, die die Platznahme des Porphyrs begleitet hat.

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  1. L. G. Corretgé &  O. Suárez

    Present address: Department of Geology (Petrology and Geochemistry, University of Oviedo, C/.Arias de Velasco s/n., E-33005, Oviedo, Spain

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    1. L. G. Corretgé
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    2. O. Suárez
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    Corretgé, L.G., Suárez, O. A garnet-cordierite granite porphyry containing rapakivi feldspars in the Cabeza de Araya batholith (extremadura, spanish Hercynian belt). Mineralogy and Petrology 50, 97–111 (1994). https://doi.org/10.1007/BF01160142

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