Cronología Rb-Sr y K-Ar de diques de la Sierra de Guadarrama (Sistema Central Español).

  1. Galindo Francisco, Carmen
  2. Huertas Coronel, María José
  3. Casquet Martín, César
Zeitschrift:
Geogaceta

ISSN: 0213-683X

Datum der Publikation: 1994

Nummer: 16

Seiten: 23-26

Art: Artikel

Andere Publikationen in: Geogaceta

Zusammenfassung

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