RT Journal Article
T1 Evolución metamórfica de las kinzigitas en facies granulita del macizo del Aglí
T1 Metamorphic evolution of granulite facies kinzigites from Agly massif
A1 Giró, E.
A1 Alías, Gemma
AB In the Agly massif outcrops one of the deepest parts of the Hercynian crust. Its basement is constituted bya monotonous pile of paragneisses and anatectic migmatites which presents numerous intercalations ofkinzigites, marbles, calcsilicates and basic rocks. This work describes the main structural and metamorphicfeatures of the kinzigites in order to define the P-T evolution of a granulite facies crustal segment. The mainmineral metamorphic association is in equilibrium at the univariant prograde reaction biotite + sillimanite+ quartz = cordierite + garnet + K-feldspar + H2O and it is formed synchronously with the developmentof the regional foliation (S2). Following this association and close to the climax, there is a slight pressuredrop recorded in the formation of cordierite coronas around garnet porphyroblasts; finally there is aretrograde stage linked to a high grade extensional event (D3). Petrographic observations in conjunctionwith Schreinemakers analysis and thermobarometric calculations have enable the construction of a nearlyisobaricP-T path and determine that the metamorphic peak is reached at 790 ºC and 5,5 kbar by thedeepest rocks. Assuming a linear gradient it is concluded that the climax is achieved at different times andat different crustal levels and that, af ter the climax, there is an important shor tening of the lithologicalcolumn consistent with an extensional unroofing
YR 2006
FD 2006
LK http://hdl.handle.net/10272/8480
UL http://hdl.handle.net/10272/8480
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 13 jun 2026