Abstract
The Panticosa granodiorite is a relatively small Hercynian intrusion in the axial zone of the Aragon Pyrenees. It is emplaced in strongly folded psammitic, pelitic and calcareous sediments of Devonian and Carboniferous age. These are metamorphosed to hornblende-hornfels facies assemblages adjacent to the intrusion. The granodiorite in the upper Rio Ara Valley is composed of andesine, quartz, biotite, hornblende and alkali feldspar. However, at contacts with limestone, it has a narrow relatively fine-grained marginal facies, which contains labradorite/bytownite and diopside, and virtually no biotite or alkali feldspar. This calcium-enriched facies appears to have been formed by local solution of impure limestone in a granodiorite liquid.
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