amphibolite
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The Piedra Alta Terrane consists of two metamorphic belts: Arroyo Grande and Montevideo and a huge central granitic region with frequent gneiss and amphibolite xenoliths (Oyhantçabal et al. | El Terreno Piedra Alta consiste en dos cinturones metamórficos: Arroyo Grande y Montevideo y una gran región granítica central con ortogneisses y ocasionales anfibolitas (Oyhantçabal et al. |
Of special attention are the circular formations on the walls of the cave, which were created by alternating pale layers of marble and dark layers of amphibolite. | Atraen la atención las curiosas formaciones circulares en las paredes de la cueva, los cuales se originan por capas claras y oscuras de las capas de mármol de anfibolites. |
Various forms of potassium were determined in A and B horizons from soils developed from different parent materials (granite, Villalba schist, Órdenes schist, slate, amphibolite and serpentinite) in Galicia (NW Spain). | Se estudiaron distintas formas de potasio en horizontes A y B de suelos de Galicia desarrollados sobre distintos materiales originales: granitos, esquistos de Villalba, esquistos de Órdenes, pizarras de Guntín, anfibolitas y serpentinitas. |
U-Pb dating by LA-MC-ICPMS on zircons belonging to the amphibolite yielded a Maastrichtian age (65.7 ± 1.2 Ma) that is interpreted as the crystallization age of the basaltic protolith. | Los fechamientos de U-Pb por LA-MC-ICPMS en zircones de una anfibolita arrojaron una edad de 65.7 ± 1.2 Ma (Maastrichtiano) interpretada como la edad de cristalización del protolito basáltico. |
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