RT Journal Article
T1 U–Pb geochronology and zircon composition of late VariscanS- and I-type granitoids from the Spanish Central Systembatholith
A1 Orejana García, David
A1 Villaseca González, Carlos
A1 Valverde Vaquero, Pablo
A1 Belousova, Elena
A1 Armstrong, Richard A.
AB The Spanish Central System (SCS) batholith,located in the Central Iberian Zone, is one of the largestmasses of granite in the European Variscan Belt. Thisbatholith is a composite unit of late- and post-kinematicgranitoids dominated by S- and I-type series granite, withsubordinate leucogranite and granodiorite. Zircon traceelement contents, from two representative S-type and threeI-type granitoids from the eastern portion of the SCSbatholith, indicate a heterogeneous composition due tomagma differentiation and co-crystallisation of other traceelement-rich accessory phases. In situ, U–Pb dating ofthese zircons by SHRIMP and LA-ICP-MS shows479–462-Ma inherited zircon ages in the I-type intrusions,indicating the involvement of an Ordovician metaigneousprotolith, while the S-type intrusions exclusively containCadomian and older zircon ages. The zircon crystallisationages show that these granites have been emplaced at ca.300 Ma with a time span between 303 ± 3 Ma and298 ± 3 Ma. Precise dating by CA-ID-TIMS reveals apulse at 305.7 ± 0.4 Ma and confirms the major pulse at300.7 ± 0.6 Ma. These ages match the Permo-Carboniferousage for granulite-facies metamorphism of the lowercrust under the SCS batholith and coincide with a widespreadgranitic event throughout the Southern Variscides.Ti-in zircon thermometry indicates temperatures between844 and 784C for both the S- and I-type granites, reinforcingthe hypothesis that these granites are derived fromdeep crustal sources.
PB Springer Verlag
SN 0016-7835
YR 2012
FD 2012
LK https://hdl.handle.net/20.500.14352/43918
UL https://hdl.handle.net/20.500.14352/43918
LA eng
DS Docta Complutense
RD 10 abr 2025