Microdioritas de afinidad toleítica en las bandas de cizalla de Segovia
DOI:
https://doi.org/10.3989/egeol.85411-2685Keywords:
Petrology, Geochemistry, Continental tholeiites, Hercynian, Sierra de Guadarrama.Abstract
There are many two-pyroxene microdiorite sills along the milonitic band s of Segovia, They intruded before the second hercynian deformation phase (F2), appearing as microdiabase sills with metamorphized border zones. Microdiorites are tholeitic in composition, of continental type, usually low in K2O. Therefore they are not related to the overall calc-alkaline trend of the Sierra de Guadarrama's latehercynian plutonism. Indeed, it doesn't seem reasonable to infer a "granite precursor" character for these rocks, as they were interpreted at begining.
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