RT Journal Article
T1 Contrasting crustal sources for peraluminous granites of thesegmented Montes de Toledo Batholith (Iberian Variscan Belt)
A1 Villaseca González, Carlos
A1 Pérez-Soba Aguilar, Cecilia María
A1 Merino Martínez, Enrique
A1 Orejana García, David
A1 López García, José Ángel
A1 Billstrom, Kjell
AB 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.
PB Czech Geological Society
SN 1802-6222
YR 2008
FD 2008
LK https://hdl.handle.net/20.500.14352/49579
UL https://hdl.handle.net/20.500.14352/49579
LA eng
DS Docta Complutense
RD 8 abr 2025