Publication: Multiple crustal sources for post-tectonic I-type granites
in the Hercynian Iberian Belt
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Publication Date
2009
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Springer Science Business Media
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Abstract
A post-tectonic plutonic array of felsic I-type
granites crops out in the western Hercynian Iberian Belt.
Isotope (Sr, N d, Pb) data favour the absence of an important
input of juvenile magmas in late- to post- tectonic
Hercynian felsic magmatism in western Iberia, but suggest
a reworking of different crustal protoliths, including
oceanic metabasic rocks accreted to mid-to-Iower crustal
levels during the early stages of the collision. I-type granites
were derived from different meta-igneous protoliths ranging
from metabasic to felsic compositions depending on their
geographical position from the external (e.g. Galicia-N
Portugal, GNP) to the innermost continental areas (Spanish
Central System and Los Pedroches Batholiths). The GNP 1-
type pIu tons related to eo-Hercynian accretional terranes
have lower initial 87Sr/86Sr ratios, lower negative εNd
values, and higher 206PbP04Pb ratios than other I-type granites of the Central Iberian zone. These more isotopically
primitive Hercynian I-type granites are important in
tracking pre-Hercynian accreted oceanic lithosphere
terranes.
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