|
Título:
|
Ophiolites in the Variscan suture of NW Iberia II: Geochemistry andclassification
|
|
Autores:
|
Sánchez Martínez, S. ;
Arenas Martín, Ricardo
|
|
Tipo de documento:
|
texto impreso
|
|
Editorial:
|
Sociedad Geológica de España., 2016
|
|
Dimensiones:
|
application/pdf
|
|
Nota general:
|
info:eu-repo/semantics/openAccess
|
|
Idiomas:
|
|
|
Palabras clave:
|
Estado = Publicado
,
Materia = Ciencias: Geología: Petrología
,
Tipo = Artículo
|
|
Resumen:
|
The lithological and geochemical features of most of the NW Iberia ophiolites show they are not common MOR types. They instead formed in SSZ setting or during the opening of pull-apart type ephemeral basins. Perhaps the only exception is the Bazar Ophiolite, which has a more representative oceanic composition that seems to reflect a Cambrian accretion zone of peri-Gondwanan oceanic material below a magmatic arc system. Together with the Vila de Cruces Ophiolite, also generated during Cambrian times in relation to the opening of a back-arc basin, both reflect somewhat the earliest stages of the opening of the Rheic Ocean, the largest Paleozoic ocean generated in the peri-Gondwanan setting. The Devonian ophiolites (Careón, Purrido and Moeche ophiolites) represent the remnants of an oceanic lithosphere generated in an ephemeral basin, probably a pull-apart type, developed during dextral convergence. This basin probably opened at c. 400-390 Ma, apparently after a first interaction between the continental margins of Gondwana and Laurussia. The two ophiolitic belts in Galicia preserve evidence for the complex tectonothermal events that occurred during the assembly of Pangea. This collision was not simple, but occurred in at least two distinct events separated by the opening of pull-apart basins.
|
|
En línea:
|
https://eprints.ucm.es/60197/1/P%C3%A1ginas%20desdeGeo_temas16_ss_simposios14.pdf
|
