10.6084/m9.figshare.3454205.v1
José R.MartÍnez Catalán
José R.MartÍnez
Catalán
Javier FernÁndez-SuÁrez
Javier
FernÁndez-SuÁrez
George A. Jenner
George A.
Jenner
Elena Belousova
Elena
Belousova
AlejandroDÍez Montes
AlejandroDÍez
Montes
Provenance constraints from detrital zircon U–Pb ages in the NW Iberian Massif: implications for Palaeozoic plate configuration
and Variscan evolution
Geological Society of London
2016
Palaeozoic detrital formations
Variscan evolution Detrital zircons
NW Iberian Massif
plasma mass spectrometry
NW Iberia
Palaeozoic plate configuration
LA
zircon age populations
Geology
2016-06-21 11:58:27
Journal contribution
https://geolsoc.figshare.com/articles/journal_contribution/Provenance_constraints_from_detrital_zircon_U_Pb_ages_in_the_NW_Iberian_Massif_implications_for_Palaeozoic_plate_configuration___and_Variscan_evolution/3454205
<p>Detrital zircons from pre-orogenic Upper Ordovician to Devonian low-grade metasedimentary rocks have been dated by laser ablation–inductively
coupled plasma mass spectrometry (LA–ICP-MS) to: (1) constrain the variations of zircon age populations within the autochthonous
sequences of NW Iberia; (2) compare U–Pb detrital zircon ages with previous data; (3) test the hypothesis of the Armorica
microplate as a peri-Gondwanan terrane separated from Gondwana. The similarity in the ages of detrital zircons found in the
Palaeozoic samples studied here to those published for the Upper Proterozoic, Lower Cambrian and Lower Ordovician sediments
of NW Iberia argues against the separation of Armorica, and points to a common source area for all of the Palaeozoic detrital
formations of NW Iberia, the West African craton and the surrounding Pan-African belts. LA–ICP-MS U–Pb dating of zircons from
a synorogenic flysch preserved in klippen in the core of a syncline establishes a maximum depositional age for this deposit
as Early Namurian. This age is also a maximum age limit for thrusting and refolding in this part of the Iberian Massif. Correlation
of the zircon age populations with published ages confirms the link between the emplacement of the allochthonous complexes
of NW Iberia and synorogenic sedimentation.
</p>