Contribution of sm-nd and RB-sr isotope systems to the petrogenetic study of the peraluminous two-mica granite pluton in oporto town (Nw portugal) [Contribuição dos sistemas isotópicos Sm-Nd e Rb-Sr para o estudo petrogenético do maciço granítico peraluminoso de duas micas da cidade do Porto (NW Portugal)]

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Almeida, A (Author) FCUP; Santos, JF (Author) Other; Noronha, F (Author) Other

Journal

Title: Comunicações Geológicas

Vol. 101

Pages: 27-30

ISSN: 0873-948X

Publisher: LNEG - Laboratório Nacional de Energia e Geologia

Indexing

ISI Web of Knowledge

Scopus - 2 Citations

Scientific classification

FOS: Natural sciences

Associated Projects

PEst-OE/CTE/UI0039/2011 - Projecto Estratégico - UI 39 - 2011-2012

Other information

Authenticus ID: P-00G-4Z5

Abstract (EN): The Oporto Granite is a Variscan, highly peraluminous, leucocratic, two-mica granite. In this work, information resulting from isotopic Rb-Sr and Sm-Nd analyses on five fresh samples of the Oporto granite is presented. Rb-Sr data give a 306±7 Ma isochron (MSWD=0.72, 87Sr/86Sr=0.7128), which, within error, should reflect the emplacement age. Geochemically, initial isotopic Sr and Nd ratios, calculated according to that isochron, show a strong enrichment in radiogenic Sr and a slight depletion in radiogenic Nd, typical of S-type granites. In addition, the range of initial ¿Nd values (from -1.9 to -3.6) suggests that metapelites could have been the source of the granitic melt. © 2014 LNEG ¿ Laboratório Nacional de Geologia e Energia IP.

Language: Portuguese

Type (Professor's evaluation): Scientific