Published September 1982 | Version v1
Journal article Metadata-only

U/Pb dating of the alkaline orthogneiss of Pedroso (Alto Alentejo, Portugal) and the pre-Variscan evolution of Western Europe

Creators

  • 1. Montpellier-2 Univ., 34 (France). Centre Geologique et Geophysique
  • 2. Centre National de la Recherche Scientifique, 34 - Montpellier (France). Lab. de Geochimie Isotopique

Description

The radiochronological study by U/Pb on zircons of the alkaline orthogneiss of Pedroso provides an emplacement age of 482 +- 16 Ma. This date of the Iberian Peninsula coincides with the main pre-Variscan phase of crustal thinning recognized in France in the ''Massif Central'' and in the ''Massif des Maures''. The comparison of this U-Pb age with previous Rb-Sr results on alkaline orthogneisses of the same province confirms the age provided by samples with 87Rb/86Sr ratios lower than 60 and indicates the opening of the Rb-Sr systems for whole rocks characterized by greater 87Rb/86Sr ratios. (orig.)

Additional details

Publishing Information

Journal Title
Neues Jahrb. Mineral., Monatsh.
Journal Issue
no.9
Series
CODEN: NJMMA.;Neues Jahrb. Mineral., Monatsh.
ISSN
0028-3649

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
14783063
Subject category
S58: GEOSCIENCES;
Resource subtype / Literary indicator
Progress Report
Descriptors DEI
AGE ESTIMATION; DELAYED RADIATION EFFECTS; ISOTOPE DATING; LEAD; MINERALOGY; ROCKS; RUBIDIUM 87; STRONTIUM 86; URANIUM; ZIRCON
Descriptors DEC
ACTINIDES; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; BIOLOGICAL EFFECTS; BIOLOGICAL RADIATION EFFECTS; ELEMENTS; EVEN-EVEN NUCLEI; INTERMEDIATE MASS NUCLEI; ISOTOPES; METALS; NUCLEI; ODD-EVEN NUCLEI; OXYGEN COMPOUNDS; RADIATION EFFECTS; RADIOISOTOPES; RUBIDIUM ISOTOPES; SILICATES; SILICON COMPOUNDS; STABLE ISOTOPES; STRONTIUM ISOTOPES; TRANSITION ELEMENT COMPOUNDS; YEARS LIVING RADIOISOTOPES; ZIRCONIUM COMPOUNDS; ZIRCONIUM SILICATES