%0 Journal Article
%A Villaseca González, Carlos
%A Bellido Mulas, Félix
%A Pérez-Soba Aguilar, Cecilia María
%A Billstrom, Kjell
%T Multiple crustal sources for post-tectonic I-type granitesin the Hercynian Iberian Belt
%D 2009
%@ 0930-0708
%U https://hdl.handle.net/20.500.14352/49584
%X A post-tectonic plutonic array of felsic I-typegranites crops out in the western Hercynian Iberian Belt.Isotope (Sr, N d, Pb) data favour the absence of an importantinput of juvenile magmas in late- to post- tectonicHercynian felsic magmatism in western Iberia, but suggesta reworking of different crustal protoliths, includingoceanic metabasic rocks accreted to mid-to-Iower crustallevels during the early stages of the collision. I-type graniteswere derived from different meta-igneous protoliths rangingfrom metabasic to felsic compositions depending on theirgeographical position from the external (e.g. Galicia-NPortugal, GNP) to the innermost continental areas (SpanishCentral System and Los Pedroches Batholiths). The GNP 1-type pIu tons related to eo-Hercynian accretional terraneshave lower initial 87Sr/86Sr ratios, lower negative εNdvalues, and higher 206PbP04Pb ratios than other I-type granites of the Central Iberian zone. These more isotopicallyprimitive Hercynian I-type granites are important intracking pre-Hercynian accreted oceanic lithosphereterranes.
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