%0 Journal Article
%A Villaseca González, Carlos
%A Martín Romera, Cristina
%A Barbero González, Luis C.
%T Melts and Residua Geochemistry in a Low-To-Mid Crustal Section (Central Spain)
%D 2001
%@ 1464-1895
%U https://hdl.handle.net/20.500.14352/57017
%X Granulite terranes from Central Spain areHercynian anatectic areas of mid-crustal levels (P-Tconditions: 750-800 ° C and 4-6 kb), The granulite xenolithsuite of the same sector comes from the lower crust asdeduced from their P-T estimates (850-950 ° C and 8-11 kb).Chemical differences between granulites from terranes andthose from xenoliths are less marked in Central Spain thanin other places as this xenolith suite lack mafic lithologies.Granulitic xenoliths show U and Rb depletion, andoccasionally a subtle enrichment in Ba, Fe, Mg, Ti, (V) andHREE. Contents in Zr, Th, Y, and REE in both granulitetypes might be explained as a consequence of the minorrole of accessory phases in controlling the geochemistry ofthe residual rocks in the lower crust. Migmatiticleucosomes and other felsic anatectic melts show the sametrend of Rb and K enrichment and Fe, Mg, Ti, Cr, Ni, Vand Th, Y, Zr, Nb, REE impoverishment (compared toprotoliths) than granitic plutons. Although plutonic granitesshow higher Ca (Na), Fe and Mg contents a genetic linkwith anatectic melts is suggested. Isotopic differences (Sr,O) between granitic plutons and anatectic melts might be areflection of their derivation from a different crustal level inan isotopically stratified crust.
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