10.6084/m9.figshare.3453821.v1
Ícaro Dias da Silva
Ícaro Dias
da Silva
Ulf Linnemann
Ulf
Linnemann
Mandy Hofmann
Mandy
Hofmann
Emilio González-Clavijo
Emilio
González-Clavijo
Alejandro Díez-Montes
Alejandro
Díez-Montes
José R. Martínez Catalán
José R. Martínez
Catalán
Detrital zircon and tectonostratigraphy of the Parautochthon under the Morais Complex (NE Portugal): implications for the
Variscan accretionary history of the Iberian Massif
Geological Society of London
2016
accretionary prism
Variscan tectonic duplication
Parautochthon
plasma mass spectrometry
metasediment
Iberian Massif Zircon geochronology
NE
NW Iberian autochthonous
laser ablation inductively
Morais Allochthonous Complex
Silurian carbonaceous slates
Iberian Variscan belt
Variscan accretionary history
detrital zircon age populations
Geology
2016-06-21 11:42:17
Dataset
https://geolsoc.figshare.com/articles/dataset/Detrital_zircon_and_tectonostratigraphy_of_the_Parautochthon_under_the_Morais_Complex_NE_Portugal_implications_for_the___Variscan_accretionary_history_of_the_Iberian_Massif/3453821
<p>Zircon geochronology using laser ablation inductively coupled plasma mass spectrometry, combined with a new detailed geological
map and a stratigraphic study of the Parautochthon at the eastern rim of the Morais Allochthonous Complex, has provided new
insights into the evolution of the Iberian Variscan belt. The data confirmed that the Parautochthon is composed of two structural
units. The higher and more deformed, called the Upper Parautochthon, consists of recumbently folded pre-Variscan low-grade
metasediments deposited in the northern Gondwana passive margin during the opening of the Rheic Ocean. It represents the Variscan
tectonic duplication of the NW Iberian autochthonous sedimentary sequence triggered by the advance of a stack of allochthonous
units formed previously in an accretionary prism. Below this unit, the Lower Parautochthon is a less pervasively deformed
tectonic slice including two lithostratigraphic units (Travanca and Vila Chã formations) composed of Culm-type synorogenic
low-grade metasediments deposited in a tectonic trench located between the accretionary prism and a peripheral bulge, with
detrital zircon age populations pointing to a Late Devonian–Early Carboniferous age. These sediments were subsequently detached
from the Autochthon along mechanically weak Silurian carbonaceous slates. The provenance study on the detrital zircons implies
that this basin was fed mainly from the active margin.
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