Publication: Constraints on the provenance of the uppermost allochthonous
terrane of the NW Iberian Massif: inferences from detrital
zircon U–Pb ages
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Publication Date
2003
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Blackwell Publishing Ltd
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Abstract
Insight into the origin and pre-orogenic palaeogeographical
links of terranes involved in the assembly of collisional
mountain belts is fundamental to the understanding of orogenic
processes. Here we address the provenance and possible
tectonic settings of the uppermost allochthonous terrane of
the NW Iberian Variscan Belt through a 213-nm Laser Ablation
ICP-MS study of U–Pb ages of detrital zircons. The age groups of
zircons from greywackes in this terrane (c. 480–610, 1900–2100,
2400–2500 Ma) and the lack of Mesoproterozoic zircons suggest
an origin in a Neoproterozoic – Early Palaeozoic peri-
Gondwanan realm along the periphery of the west African
craton. It is further inferred that the greywackes were
deposited in the periphery of a crustal unit that had been
detached from the Gondwanan margin in relation to the
opening of the Rheic ocean in Cambro-Ordovician times. This
terrane was thrusted back upon the Gondwanan margin during
the course of the Variscan collision and closure of the
intervening ocean.
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