RT Book, Section
T1 Tectonic evolution of the upper allochthon of the Órdenes complex (northwestern Iberian Massif): Structural constraints to a polyorogenic peri-Gondwanan terrane
A1 Gómez Barreiro, Juan
A1 Martínez Catalán, José Ramón
A1 Arenas Martín, Ricardo
A1 Castiñeiras García, Pedro
A1 Abati Gómez, Jacobo
A1 Díaz García, Florentino
A1 Wijbrans, Jan R.
A2 Linnemann, Ulf
A2 Nance, R. Damian
A2 Kraft, Petr
A2 Zulaud, Gernold
AB The upper allochthon of northwest Iberia represents the most exotic terrane of this part of the European Variscan belt. Recent advances in the metamorphic petrology, structural geology, and geochronology of the upper allochthon in the Órdenes complex are integrated into a synthesis of its tectonic evolution, constraining the main tectonothermal events. Important aspects of this synthesis are (1) the interpretation of Cambro-Ordovician magmatism and earliest metamorphic event, as the result of drifting of a peri-Gondwanan terrane; (2) the subsequent shortening and crustal thickening of the terrane related to its subduction and accretion to Laurussia; (3) a younger cycle of shortening and extension resulting from convergence between Laurussia and Gondwana; and (4) the emplacement of this exotic terrane as the upper allochthon, together with underlying ophiolitic and basal allochthons, during the Laurussia-Gondwana collision. Implications derived from the well-established tectonothermal sequence are discussed in the context of Paleozoic paleogeography and geodynamics. The evolution of this part of the belt is related first to the closure of the Tornquist Ocean, and later to that of the eastern branch of the Rheic Ocean. Furthermore, the relative paleopositions of the upper allochthon and the Iberian autochthon in northern Gondwana are discussed.
PB Geological Society of America
SN 9780813724232
YR 2007
FD 2007-01-01
LK https://hdl.handle.net/20.500.14352/53786
UL https://hdl.handle.net/20.500.14352/53786
LA eng
NO Dirección General de Investigación Científica y Técnica
NO Dirección General de Educacion Superior e Investigación Científica
DS Docta Complutense
RD 6 may 2024