Presencia de cloritoide en la aureola térmica de los plutones de Cauterets occidental-Panticosa (Zona Axial del Pirineo, Huesca)

Abstract

The Cauterets-Panticosa granite complex, including Panticosa, West-Cauterets and East-Cauterets plutons, crops out in the Axial Zone of the Pyrenees, and generated a continuous metamorphic zone. In the Tena Valley, Panticosa and West-Cauterets plutons are intrusive in a Devonian metasedimentary series that show a low regional metamorphism. In the thermal aureole, limestones are transformed into marbles and pelitic rocks into hornfelses. The most common minerals in metapelitic rocks are biotite + andalusite ± muscovite ± cordierite ± almandine. In this region the thermal aureole cartography is based on the presence of andalusite. In this work, we describe for first time the presence of chloritoid. The chloritoid is overprinting the rock fabric of the fine-grain schists. The microprobe analysis of chloritoid resulted in high contents of FeO and low contents of MgO and MnO. Finally, the geological implications of the chloritoid determination up to 1.5 km from the cartographic aureole were discussed