RT Journal Article
T1 Cronología Rb-Sr y K-Ar de diques de la Sierra de Guadarrama (Sistema Central Español)
T1 Rb-Sr and K-Ar chronology of dykes from the Sierra de Guadarrama (Spanish Central System)
A1 Galindo, Carmen
A1 Huertas, María José
A1 Casquet Martín, César
AB Two calcalkaline granite porphyries, an E-W and a N-S trending one, and three monzonitic dykes striking NE-SW, have been dated. For the first dyke a whole rock Rb-Sr isochrone age of296±3 Ma, i.e. Upper Carboniferous, is obtained. However, the second dyke provides only a regression age of 314±31 Ma. Whole rock K-Ar ages of the monzonitic dykes are 245±7, i.e. Lower-Middle Triassic, for two of them, and 220±5 for the third. The first age rises doubts about the up-to-the-present alleged posteriority of the E-W dykes relative to the large granitic plutonism in the area. The second is geologically reasonable within the limits of error only, as N-S dykes must be younger than the Cabeza Mediana pluton, which is 291+6 Ma old, and older than the hydrothermal episyenitic event dated at 274 ± 6 Ma. For the monzonitic dykes the age of 245 ± 7 Ma is taken as representative of the injection episode, whilst the second age probably results from superimposed alteration. This alkaline episode can be correlated with the opening of the Iberian trough
PB Sociedad Geológica de España
YR 1994
FD 1994
LK http://hdl.handle.net/10272/13935
UL http://hdl.handle.net/10272/13935
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 1 jun 2026