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Title: | Hercynian late-post-tectonic granitic rocks from the Fornos de Algodres area (Northern Central Portugal) |
Author: | Azevedo, M. R. Nolan, J. |
Keywords: | Assimilation Fractional crystallization Granites Hybridization Iberian Variscan Fold Belt Magma mixing Portugal Hercynian orogeny |
Issue Date: | 1998 |
Publisher: | Elsevier |
Abstract: | The Fornos de Algodres Complex (FAC) comprises several intrusions of late-post-tectonic Hercynian granitic rocks ranging in composition from hornblende granodiorites and quartz monzodiorites, through coarse porphyritic biotite granites and two-mica granites (coarse-, medium- and fine-grained), to muscovite-rich leucogranites. Field and regional constraints show that the emplacement of this large, composite, batholithic complex post-dates the main Variscan regional deformation phases (D1 + D2 + D3) and associated metamorphic events. Field, petrographic and geochemical data suggest a strong genetic relationship between most of the members of the FAC. However, their Rb-Sr and Sm-Nd isotopic signatures appear to rule out any genetic process involving a single homogeneous source and/or closed-system fractional crystallization of the same parental magma. A model involving hybridization of mantle-derived basaltic liquids with crustal anatectic melts followed by further contamination and fractional crystallization is proposed to explain the isotopic and geochemical variation trends defined by the FAC granitic rocks. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/13025 |
DOI: | 10.1016/S0024-4937(98)00019-X |
ISSN: | 0024-4937 |
Appears in Collections: | DGeo - Artigos |
Files in This Item:
File | Description | Size | Format | |
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lithos_Azevedo_Nolan_98.pdf | documento principal | 1.7 MB | Adobe PDF | View/Open |
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