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https://hdl.handle.net/1822/1769
Título: | Mantle-like Sr-Nd isotope composition of Fe-K subalkaline granites : the Peneda-Gerês Variscan massif (NW Iberian Peninsula) |
Autor(es): | Mendes, Anabela Carreira Dias, G. |
Palavras-chave: | Granite Variscan Isotope Iberia Petrogenesis Mantle |
Data: | 2004 |
Editora: | Blackwell Publishing |
Revista: | Terra Nova |
Citação: | "Terra nova". ISSN 0954-4879. 16:3 (2004) 109-115. |
Resumo(s): | The Peneda-Gerês massif is one of the most representative NW Iberian late- to post-orogenic Variscan granitic plutons. It resulted essentially from the subsynchronous emplacement, at 290-296 Ma, of two granitic magmas of Fe-K subalkaline affinity, with primitive isotopic composition: Sri = 0.703-0.707 and eNdi = -1.5 to -2.4. An origin by mantle input followed by mantle-crust interactions is proposed, implying the contribution of a less enriched mantle component than that involved in the genesis of syn-orogenic hybrid granitoids of Mg-K subalkaline affinity. A less voluminous aluminopotassic and isotopically more evolved magma (Sri = 0.708-0.709 and eNdi = -3.5 to –3.9) with little or no mantle input was also generated, suggesting the involvement of lower crust materials. Therefore, this study suggests an input of juvenile magmas in late-Variscan times, the mantle-like isotope signature of Fe-K granitic magmatism being clearly related to a geodynamic setting of extensional processes, large-scale uplift and thinning. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/1769 |
DOI: | 10.1111/j.1365-3121.2004.00537.x |
ISSN: | 0954-4879 1365-3121 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CCT - Artigos (Papers)/Papers |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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mendes&dias.pdf | 383,68 kB | Adobe PDF | Ver/Abrir |