El stock de Santa Elena (Jaén)una intrusión genéticamente independiente de la asociación magmática del batolito de Los Pedroches

Résumé

The Santa Elena stock has been classically considered as belonging to the magmatic association of the Los Pedroches Batolith. The stock is intrusive into psammo-pelitic materials Ordovician to Carboniferousin age. The Santa Elena stock is composed of biotite granodiorite to tonalite with gabbro-diorite as enclaves of variable size outcropping in northern sectors of the intrusion. Pelitic xenoliths of various sizes, likely related to magma stopping, are common through the massif. The Santa Elena stock is intruded by a dike complex made of aplite and ore-bearing quartz veins. The two main lithological units exhibit different geochemical features with local evidence of magma mixing between acid and basic types. The granodiorite-tonalite is chemically homogeneous regarding the content of major and trace elements, including REE. These rocks correspond to mildly peraluminous terms of an alumino-cafemic association of calc-alkaline character.The gabbrodiorite enclaves are meta-aluminous and clearly deviate from the geochemical trend defined by granodiorite and tonalite. The rocks from the Santa Elena stock are very different from the common granodiorite types of the Los Pedroches Batolith. It appears from the petrological and geochemical data that the Santa Elena stock corresponds to an independent and different magma from that at the origin of the Los Pedroches to which it had been classically associated.