RT Journal Article
T1 Rutilos ricos en Zr incluidos en granates de xenolitos granulíticosde la corteza inferior del Sistema Central Español: implicacionesgeodinámicas
A1 Villaseca González, Carlos
A1 Orejana García, David
AB Two petrographic types of rutile are observed in the peraluminous felsic meta-igneous granulites, the mostcommon type of the lower crustal xenolith suite of the Spanish Central System (SCS). Rutile-1 (Rt-1)corresponds to small crystals (mainly < 80 mm) only preserved as micro-inclusions within garnet, whereasrutile-2 (Rt-2) is commonly found as big idiomorfic crystals forming the granulite granoblastic matrix.Chemical analyses by EMP show a higher Zr content in Rt-1 (up to 7800 ppm) than in Rt-2 (up to 5200ppm) of the same granulite. Applying Zr-in-rutile thermometry, Rt-1 gives 50-60 ºC higher for rutilecrystallization (950-1015 ºC) when compared to Rt-2 thermometry (940-955 ºC). These ultra-hightemperatures (UHT) are likely attained at Moho depths without external heat sources (e.g. mantle input)as supported by the high heat production estimated for the crustal section of the SCS. The granulitegranitepetrogenetic link suggests that these HT-UHT granulites were generated by intra-crustal reworkingduring Hercynian continental thickening.
PB Sociedad Geológica de España
SN 0213-683X
YR 2008
FD 2008
LK https://hdl.handle.net/20.500.14352/49608
UL https://hdl.handle.net/20.500.14352/49608
LA spa
DS Docta Complutense
RD 10 abr 2025