RT Journal Article
T1 Rutilos ricos en Zr incluidos en granates de xenolitos granulíticos de la corteza inferior del Sistema Central Español: implicaciones geodinámicas
T1 Zr-rich rutile included in garnet from lower crustal granulite xenoliths of the Spanish Central System: geodynamicimplications
A1 Villaseca, Carlos
A1 Orejana, 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
YR 2008
FD 2008
LK http://hdl.handle.net/10272/8289
UL http://hdl.handle.net/10272/8289
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 31 may 2026