RT Journal Article
T1 U–Pb detrital zircon analysis of the lower allochthon of NW Iberia: age constraints,provenance and links with the Variscan mobile belt and Gondwanan cratons
A1 Díez Fernández, Rubén
A1 Martínez Catalán, José Ramón
A1 Arenas Martín, Ricardo
A1 Abati Gómez, Jacobo
A1 Gerdex, Axel
A1 Fernández Suárez, Javier
AB Detrital U–Pb laser ablation inductively coupled plasma mass spectrometry zircon ages from sixsiliciclastic samples from the lower allochthon of NW Iberia are analysed to constrain their maximum sedimentationage and provenance, and to evaluate the connections to the adjacent tectonostratigraphic domains.Deposited in the external sections of the Gondwana platform, their maximum depositional age is latest Neoproterozoic(c. 560 Ma). Comparison of the age populations of the lower allochthon with those of the rest ofthe allochthonous and autochthonous units of NW Iberia suggests that the terranes located in the footwall ofthe Variscan suture should not be considered as exotic elements, but as contiguous pieces of the same continentalmargin transported onto the adjacent Gondwana mainland in Variscan times. The data are in agreementwith the regional trend defined by the drop in Early Neoproterozoic and Mesoproterozoic zircon contentupward in the tectonic pile, which had been previously proposed as a marker of proximity to the eastern partof the West African Craton. Based on the age spectra, the palaeoposition for the time of sedimentation isplaced in northern Africa, between the West African and Saharan cratons. Particular attention is paid to theoccurrence of an Early Neoproterozoic input, probably derived from the Pan-African Hoggar suture
PB Geological Society of London.
SN 0016-7649
YR 2012
FD 2012
LK https://hdl.handle.net/20.500.14352/44357
UL https://hdl.handle.net/20.500.14352/44357
LA eng
DS Docta Complutense
RD 26 ago 2024