2026-06-07T15:18:06Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/419932024-07-29T16:57:49Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Villaseca González, Carlos
author
Belousova, Elena
author
Orejana García, David
author
Castiñeiras García, Pedro
author
Pérez-Soba Aguilar, Cecilia María
2023-06-20T00:06:41Z
2023-06-20T00:06:41Z
2011
0301-9268
https://hdl.handle.net/20.500.14352/41993
http://www.elsevier.com/locate/precamres
Hf-isotope analyses in previously dated zircon crystals from four Variscan granulite-facies rocks from
central Iberia have been studied to examine crustal evolution processes. Two samples are from exposed
migmatite terranes, the other two are granulite xenoliths from lower crustal levels. Hf model ages show
that lower crustal granulites display a bigger contribution of Archean components than exposed highgrade
rocks (14% of the zircon population instead of 6%), reinforcing ideas of preservation of ancient
crustal material in the lower crust. The distribution of age-Hf isotope data from zircon suggests two
juvenile crust formation events in central Iberia: the main one during the Neoproterozoic (540–620 Ma)
and a possible second Mesoproterozoic event around 1.0–1.2 Ga. Magmatism appears in the Central
Iberian Zone exclusively related to that younger juvenile addition. Hf data of granulite zircons agrees
with recent palaeogeographical reconstruction models which present central Iberia as a peri-Gondwanan
terrane located between the West African craton and the Arabian shield, far from the Amazonia
microplate.
eng
Presence of Palaeoproterozoic and Archean components in the granulite-facies
rocks of central Iberia: The Hf isotopic evidence
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