Abstract
The Santa Eufemia pluton is part of the composite magmatic assoclatlon of Los Pedroches batholith, located in the southern branch of the Central Iberian Zone of the Hercynian orogenic belt of Spain. This high-Ievel postkynematic batholith consists of three main types of plutonic rocks: boitite±amphibole granodiorites, biotite-cordierite porphiritic monzogranites and cordierite leucogranites. The Santa Eufemia pluton consists of biotite-cordierite monzogranites, and in a lesser extent of cordierite leucogranites. Scarce enclaves of different type are found in the monzogranites, biotiteplagioclase- eordierite and fine grained porphiritic monzogranite enclaves being the most common. The petrographic, structural and geochemical (major and trace elements) data suggests a compiex evolutionary history of a metasedimentary-source monzogranitic magma with no genetical relationships with more basic magmas such as the one which is now represented by the granodiorite facies of the batholith. Non-minimum melt and reequilibrated source material (secondary restites) mixing during the ortomagmatic evolution of the magma accounts for the compositional heterogenities of the monzogranites. The ultimate product of this evolution is the segregation of a fluid-saturated residual liquid in the final level of intrusion of the magma, leading to the emplacement of leucogranite masses and dikes and the exsolution of a supercritical fluid phase related with the late magmatic recrystallization of sorne mineral phases (muscovite, albite, quartz, tourmaline, topaz), the geochemical removilization of sorne incompatible trace elements (Rb, Cs, Li, Be, Sn, Nb) due to fluid-rock interactions and the formation of periplutonic wolframite-arsenopyritequartz mineralizations.
Highlights
El plutón de Santa Eufemia forma parte del batolito de Los Pedroches, situado en el extremo sudoccidental de la Zona Centro-Ibérica del Macizo Hercínico español
The Santa Eufemia pluton is part of the composite magmatic assoclatlon of Los Pedroches batholith, located in the southern branch of the Central Iberian Zone of the Hercynian orogenic belt of Spain. This high-Ievel postkynematic batholith consists of three main types of plutonic rocks: boitite±amphibole granodiorites, biotite-cordierite porphiritic monzogranites and cordierite leucogranites
The Santa Eufemia pluton consists of biotite-cordierite monzogranites, and in a lesser extent of cordierite leucogranites
Summary
Los cuerpos plutónicos que integran el batolito de Los Pedroches (fig. 1) representan intrusiones múltiples que siguen un esquema clásico, tanto en el Macizo Hercínico Ibérico como en los Variscides europeos, y pueden calificarse como una asociación hercinotipo (Pitcher, 1982). La secuencia de intrusión de los granitoides mayoritarios está bien establecida de acuerdo con los datos de campo y las relaciones observadas con las fases de deformación hercínicas, y sigue el orden en que se han enumerado (Prost-Dame, 1980; Eraso y Garrote, 1981; Garrote el al., 1983; Pascual, 1984). Estas edades son en parte contradictorias con los datos geológicos regionales, tanto en lo que respecta a las edades de intrusión como a la secuencia temporal de intrusiones (García-Casco, 1986; Serrano Pinto el a1., 1987). La intrusión de gran parte del batolito en el Carbonífero Inferior, que representa el techo de la serie estratigráfica local, permite deducir una profundidad de intrusión no mayor de 4 km (Pascual, 1984)
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