RT Journal Article
T1 Tectonic evolution of a continental subduction‐exhumationchannel: Variscan structure of the basal allochthonousunits in NW Spain
A1 Díez Fernández, Rubén
A1 Martínez Catalán, José Ramón
A1 Arenas Martín, Ricardo
A1 Abati Gómez, Jacobo
AB A regional study starting from detailed geological mapping has been carried out inthe Malpica‐Tui Complex of Galicia in NW Spain. The complex is formed by twounits representing pieces of the external edge of Gondwana, subducted and exhumedduring the Variscan collision. The study shows that synsubduction and earlysynexhumation structures in continental subduction channels tends to be obscuredand even erased once exhumation is complete. Detailed structural analysis, matched withthe knowledge of the history, and available data for other Galician basal units haveelucidated the major structures developed during the subduction‐exhumation process.The results include evidence of the plate convergence causing early Variscan continentalsubduction of the Gondwana margin. Subduction was followed by exhumation drivenby ductile thrusting within the subduction channel, which, in turn, provoked crustalduplication in the subducted slab and modified the initial tectonometamorphic architectureof the subduction wedge. The next step was accretion to the adjacent continental domains,placing the subduction wedge on top of unsubducted parts of the Gondwana marginvia ductile thrusting. Thrusting was preceded by progressive propagation of a train ofrecumbent folds toward the foreland that affected the previous structural stack. Subsequenttransference of oceanic (Rheic) and peri‐Gondwanan terranes to the Gondwana margintook place by out‐of‐sequence thrusting followed by crustal extensional collapse andstrike‐slip tectonics
PB European Geoscience Union
SN 0278-7407
YR 2011
FD 2011
LK https://hdl.handle.net/20.500.14352/42446
UL https://hdl.handle.net/20.500.14352/42446
LA eng
DS Docta Complutense
RD 28 abr 2024