RT Journal Article
T1 Cronología Rb-Sr y K-Ar de diques de la Sierra de Guadarrama(Sistema Central Español)
A1 Galindo Francisco, María Del Carmen
A1 Huertas Coronel, María José
A1 Casquet Martín, César
AB Two calcalkaline granite porphyries, an E-W and a N-S trending one, and three monzonitic dykesstriking NE-SW, have been dated. For the first dyke a whole rock Rb-Sr isochrone age of 296±3 Ma, i.e.Upper Carboniferous, is obtained. However, the second dyke pro vides only a regression age of314±31 Ma. Whole rock K-Ar ages of the monzonitic dykes are 245±7,i.e. Lower-Middle Triassic, fortwo of them, and 220±5 for the third. The first age rises doubts about the up-to-the-present allegedposteriority of the E-W dykes relative to the large granitic plutonism in the area. The second isgeologically reasonable within the limits of error only, as N-S dykes must be younger than the CabezaMediana pluton, which is 291 ±6 Ma old, and older than the hydrothermal episyenitic event dated at274±6 Ma. For the monzonitic dykes the age of 245±7 Ma is taken as representative of the injectionepisode, whilst the second age probably results from superimposed alteration. This alkaline episodecan be correlated with the opening of the Iberian trough.
PB Sociedad Geológica de España
SN 0213-683X
YR 1994
FD 1994
LK https://hdl.handle.net/20.500.14352/56937
UL https://hdl.handle.net/20.500.14352/56937
LA spa
DS Docta Complutense
RD 6 abr 2025