10.6084/m9.figshare.3454931.v1
James A. Braid
James A.
Braid
J. Brendan Murphy
J. Brendan
Murphy
Cecilio Quesada
Cecilio
Quesada
Jim Mortensen
Jim
Mortensen
Tectonic escape of a crustal fragment during the closure of the Rheic Ocean: U–Pb detrital zircon data from the Late Palaeozoic
Pulo do Lobo and South Portuguese zones, southern Iberia
Geological Society of London
2016
allochthonous South
crustal fragment
Zone display populations
Pulo
Southern Uplands terrane
Lobo Zone
Rheic Ocean
Geology
2016-06-21 12:27:08
Dataset
https://geolsoc.figshare.com/articles/dataset/Tectonic_escape_of_a_crustal_fragment_during_the_closure_of_the_Rheic_Ocean_U_Pb_detrital_zircon_data_from_the_Late_Palaeozoic___Pulo_do_Lobo_and_South_Portuguese_zones_southern_Iberia/3454931
<p>The Pulo do Lobo Zone, which crops out immediately north of the allochthonous South Portuguese Zone in southern Iberia, is
classically interpreted as a polydeformed accretionary complex developed along the southern margin of the Gondwanan parautochthon
(Ossa–Morena Zone), during the late Palaeozoic closure of the Rheic Ocean. This closure was a major event during the amalgamation
of Pangaea. U–Pb laser ablation inductively coupled mass spectrometry dating of detrital zircons from late Palaeozoic Devono-Carboniferous
clastic units in the South Portuguese Zone and Pulo do Lobo Zone yield contrasting age populations and attest to the exotic
nature of both zones. Detrital zircons from the South Portuguese Zone display populations typical of detritus derived from
either Gondwana (Ossa–Morena Zone), or peri-Gondwanan terranes. In contrast, rocks from the Pulo do Lobo Zone contain populations
consistent with derivation from Baltica, Laurentia or recycled early Silurian deposits along the Laurentian margin. An example
of one such deposit is the Southern Uplands terrane of the British Caledonides. Taken together, these data can be reconciled
by a model involving tectonic transport of a crustal fragment that was laterally equivalent to the Southern Uplands terrane
between the allochthonous South Portuguese Zone and Gondwana as a result of an early Devonian collision between an Iberian
indenter with Laurussia.
</p>