Age and composition of granulite xenoliths from Paso de Indios, Chubut province, Argentina

Granulite xenoliths enclosed in Paleogene alkali basalts from the locality of Paso de Indios in The Argentinean Patagonia, have been studied for petrology, geochemistry and U–Pb SHRIMP zircon geochronology. These are lower crust xenoliths composed of pyroxene and plagioclase dominantly. Symplectitic...

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Bibliographic Details
Published in:Journal of South American earth sciences 2011-12, Vol.32 (4), p.567-574
Main Authors: Castro, Antonio, Aragón, Eugenio, Díaz-Alvarado, Juan, Blanco, Idael, García-Casco, Antonio, Vogt, Katharina, Liu, D.-Y.
Format: Article
Language:English
Subjects:
Granulite xenoliths
Jurassic magmatism
Lower crust
South America
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Summary:Granulite xenoliths enclosed in Paleogene alkali basalts from the locality of Paso de Indios in The Argentinean Patagonia, have been studied for petrology, geochemistry and U–Pb SHRIMP zircon geochronology. These are lower crust xenoliths composed of pyroxene and plagioclase dominantly. Symplectitic overgrowths with olivine and new pyroxene-plagioclase formation around the large pyroxene crystals are common. The study of phase equilibrium yields a decompression path from pressure 0.9 GPa at temperatures of about 1000 °C. The major element composition does not correspond with any known basaltic or andesitic magmas. They have SiO 2 
ISSN:0895-9811
1873-0647
DOI:10.1016/j.jsames.2011.06.001