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Anticlockwise P-T Path of Granulites from the Monte Castelo Gabbro (Ordenes Complex, NW Spain) |
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| Authors: | ABATI JACOBO; ARENAS RICARDO; MARTINEZ CATALAN JOSE RAMON; DIAZ GARCIA FLORENTINO |
| Institution: | 1DEPARTAMENTO DE PETROLOGÍA Y GEOQUÍMICA, FACULTAD DE C.C. GEOLÓGICAS, UNIVERSIDAD COMPLUTENSE, 28040 MADRID, SPAIN 2DEPARTAMENTO DE GEOLOGÍA, UNIVERSIDAD DE SALAMANCA, 37008 SALAMANCA, SPAIN 3DEPARTAMENTO DE GEOLOGÍA, UNIVERSIDAD DE OVIEDO, 33005 OVIEDO, SPAIN |
| Abstract: | The study of mafic and aluminous granulites from the Monte CasteloGabbro (Órdenes Complex, NW Spain) reveals an anticlockwiseP–T path that we interpret as related to the tectonothermalactivity in a magmatic arc, probably an island arc. The P–Tpath was obtained after a detailed study of the textural relationshipsand mineral assemblage succession in the aluminous granulites,and comparing these with an appropriate petrogenetic grid. Additionalthermobarometry was also performed. The granulites are highlyheterogeneous, with distinct compositional domains that mayalternate even at thin-section scale. Garnets are generallyidiomorphic to subidiomorphic, and in certain domains of thealuminous granulites they show overgrowths forming xenomorphiccoronas around a more or less idiomorphic core. Both types ofgarnets show significant Ca enrichment at the crystal rims,which, together with the other mineralogical and textural characteristics,is compatible with a pressure increase with low T variation.P–T estimations indicate a peak of T > 800°C andP |
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