%0 Journal Article
%A Villaseca González, Carlos
%A Pérez-Soba Aguilar, Cecilia María
%A Merino Martínez, Enrique
%A Orejana García, David
%A López García, José Ángel
%A Billstrom, Kjell
%T Contrasting crustal sources for peraluminous granites of thesegmented Montes de Toledo Batholith (Iberian Variscan Belt)
%D 2008
%@ 1802-6222
%U https://hdl.handle.net/20.500.14352/49579
%X The Variscan Montes de Toledo Batholith (MTB) is an E–W linear array of peraluminous granite plutons which is chemicallysegmented. The study is focused on the western segment of the MTB (W-MTB), mainly composed of graniteswith slightly lower CaO and higher P2O5 contents than associated eastern plutonic units and nearby S-type granites,giving them a more pronounced peraluminous nature. The chemical contrast is also observed in isotopic composition,especially in radiogenic Nd and Pb ratios. The W-MTB granites have higher initial εNd (–5.0 to –5.9) and lower 206Pb/204Pband 208Pb/204Pb ratios than peraluminous types from the E-MTB segment. A mixed pelitic–greywackeous derivation fromregional Neoproterozoic formations is suggested, whereas lower crustal and meta-igneous sources were involved in theorigin of the easternmost MTB granites. The presence of igneous muscovite together with coexisting andalusite andsillimanite in some of the studied granites suggests that solidus was reached at 650–700 ºC and depth corresponding tothe pressure of 2–3 kbar.
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