Show simple item record

Rb-Sr and K-Ar chronology of dykes from the Sierra de Guadarrama (Spanish Central System)

dc.contributor.authorGalindo, Carmen
dc.contributor.authorHuertas, María José
dc.contributor.authorCasquet Martín, César
dc.description.abstractTwo 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 troughes_ES
dc.publisherSociedad Geológica de Españaes_ES
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.subject.otherGeocronología Rb-Sres_ES
dc.subject.otherGeocronología K-Ares_ES
dc.subject.otherSierra de Guadarramaes_ES
dc.subject.otherSistema Central Españoles_ES
dc.titleCronología Rb-Sr y K-Ar de diques de la Sierra de Guadarrama (Sistema Central Español)es_ES
dc.titleRb-Sr and K-Ar chronology of dykes from the Sierra de Guadarrama (Spanish Central System)eng

Files in this item

This item appears in the following Collection(s)

Show simple item record

Atribución-NoComercial-SinDerivadas 3.0 España
Except where otherwise noted, this item's license is described as Atribución-NoComercial-SinDerivadas 3.0 España

Copyright © 2008-2010. ARIAS MONTANO. Repositorio Institucional de la Universidad de Huelva
Contact Us | Send Feedback |