Las espesartitas, camptonitas y bostonitas del complejo intrusivo de Aiguablava (Cadenas Costeras Catalanas): cartografía y composición

Abstract

The lower Permian Hercynian Aiguablava leucogranite (288 Ma) is intruded by a dense vertical dyke swarm and a few subhorizontal dykes that fill several joint systems developed during the crystallization and cooling of the plutonic intrusions. The hypabyssal rocks have been divided into three groups: 1) felsites and granophyres (out of the studied area in this work), 2) calc-alkaline lamprophyres (spessartites), probably upper Permian (253 Ma whole-rock K-Ar age) and 3) upper Cretaceous (76 Ma) alkaline lamprophyres (camptonites). This work provides new cartographic and geochemical data that allow to show the morphology, distribution and dimensions of the intrusions and the presence of a fourth type of differentiated alkaline lamprophyres (bostonites) not previously described in the Catalan Coastal Ranges