RT Journal Article
T1 Constraints on the provenance of the uppermost allochthonousterrane of the NW Iberian Massif: inferences from detritalzircon U–Pb ages
A1 Fernández Suárez, Javier
A1 Díaz García, Florentino
A1 Jeffries, Teresa E.
A1 Arenas Martín, Ricardo
A1 Abati Gómez, Jacobo
AB Insight into the origin and pre-orogenic palaeogeographicallinks of terranes involved in the assembly of collisionalmountain belts is fundamental to the understanding of orogenicprocesses. Here we address the provenance and possibletectonic settings of the uppermost allochthonous terrane ofthe NW Iberian Variscan Belt through a 213-nm Laser AblationICP-MS study of U–Pb ages of detrital zircons. The age groups ofzircons from greywackes in this terrane (c. 480–610, 1900–2100,2400–2500 Ma) and the lack of Mesoproterozoic zircons suggestan origin in a Neoproterozoic – Early Palaeozoic peri-Gondwanan realm along the periphery of the west Africancraton. It is further inferred that the greywackes weredeposited in the periphery of a crustal unit that had beendetached from the Gondwanan margin in relation to theopening of the Rheic ocean in Cambro-Ordovician times. Thisterrane was thrusted back upon the Gondwanan margin duringthe course of the Variscan collision and closure of theintervening ocean.
PB Blackwell Publishing Ltd
SN 0954-4879
YR 2003
FD 2003
LK https://hdl.handle.net/20.500.14352/57761
UL https://hdl.handle.net/20.500.14352/57761
LA eng
NO ("The definitive version is available at www.blackwell-synergy.com")
DS Docta Complutense
RD 4 abr 2025