Geocronología 207/Ob/209Pb en cristal único de circón y Rb-Sr del plutón de la Cabrera (Sierra del Guadarrama)

  1. Montero, P.
  2. Lozano Fernández, Rafael Pablo
  3. Casquet Martín, César
  4. Galindo Francisco, Carmen
  5. Bea Barredo, Fernando
Revista:
Geogaceta

ISSN: 0213-683X

Año de publicación: 2003

Número: 35

Páginas: 71-74

Tipo: Artículo

DIALNET GOOGLE SCHOLAR lock_openArias Montano editor

Otras publicaciones en: Geogaceta

Resumen

A Pb-Pb crystallization age of 302 ±3 Ma was found for the La Cabrera granite by the single zircon Pbevaporation technique. Moreover the whole rock Rb-Sr isotope systematics provided an errochrone of 303 ± 24 Ma (I.R. = 0.709275; MSWD = 23.4). This age is Upper Carboniferous and is close to the end of a stage of regional N-S extension subsequent to the climax of Variscan regional metamorphism. The high MSWD of the Rb-Sr systematics might be attirbuted to either an ubiquitous weak pervasive hydrothermal alteration or to the absence of initial isotopic equilibrium throughout the pluton. The second possibility is favored from Nd isotope composition considerations.

Fuente de los datos: Dialnet