Paleozoic ophiolites in the Variscan suture of Galicia (northwest Spain): Distribution, characteristics, and meaning

Allochthonous ophiolitic units in the northwestern Iberian Massif are remnants of peri-Gondwanan Paleozoic oceans sandwiched among other exotic terranes of continental and volcanic-arc derivation. All these terranes defi ne an intricate suture zone that marks the convergence and collision between La...

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Authors: Arenas Martín, Ricardo, Martínez Catalán, José Ramón, Sánchez Martínez, Sonia, Díaz García, Florentino, Abati Gómez, Jacobo, Fernández Suárez, Javier, Andonaegui Moreno, María Del Pilar, Gómez Barreiro, Juan
Format: book part
Publication Date:2007
Country:España
Institution:Universidad Complutense de Madrid (UCM)
Repository:Docta Complutense
Language:English
OAI Identifier:oai:docta.ucm.es:20.500.14352/53785
Online Access:https://hdl.handle.net/20.500.14352/53785
Access Level:Open access
Keyword:552.3
Ophiolites
Rheic Ocean
Variscan belt
Petrología
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spelling Paleozoic ophiolites in the Variscan suture of Galicia (northwest Spain): Distribution, characteristics, and meaningArenas Martín, RicardoMartínez Catalán, José RamónSánchez Martínez, SoniaDíaz García, FlorentinoAbati Gómez, JacoboFernández Suárez, JavierAndonaegui Moreno, María Del PilarGómez Barreiro, Juan552.3OphiolitesRheic OceanVariscan beltPetrologíaAllochthonous ophiolitic units in the northwestern Iberian Massif are remnants of peri-Gondwanan Paleozoic oceans sandwiched among other exotic terranes of continental and volcanic-arc derivation. All these terranes defi ne an intricate suture zone that marks the convergence and collision between Laurussia and Gondwana. The suture is defi ned by three different ophiolitic ensembles: upper ophiolitic units, lower ophiolitic units, and the Somozas mélange. The lower ophiolitic units were derived from an alternation of basalts and sediments intruded by gabbros and scarce granitoids, and they formed during the opening of a marginal basin, the Galician ocean, during Late Cambrian to Early Ordovician time. This ocean was created as a back arc by the severance of a volcanic arc that had developed at the northern margin of Gondwana and formed part of the Rheic oceanic realm. The upper ophiolitic units formed during the Early Devonian from intraoceanic subduction in the early Paleozoic lithosphere of the Rheic Ocean. These suprasubduction ophiolites were formed just before the ocean closed, preceding the collision between Gondwana and Laurussia. The Somozas mélange appears in an anomalous position at the base of the Cabo Ortegal Complex. The ophiolites involved in this tectonic mélange represent an imbricate of highly dismembered oceanic lithosphere, slivers of subducted outer edge of the Gondwanan continental margin, and Paleozoic metasediments of the northern Gondwanan platform. The ophiolites might either record the development of a different peri-Gondwanan oceanic domain, or they might be equivalent to any of the other ophiolitic ensembles, and their anomalous structural position is simply a consequence of complex thrusting.Geological Society of AmericaHatcher, Robert D.Carlson, Marvin P.McBride, John H.Martínez Catalán, José RamónUniversidad Complutense de Madrid20072007-01-0120072007-01-01book parthttp://purl.org/coar/resource_type/c_3248info:eu-repo/semantics/bookPartapplication/pdfhttps://hdl.handle.net/20.500.14352/53785reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/537852026-06-02T12:44:21Z
dc.title.none.fl_str_mv Paleozoic ophiolites in the Variscan suture of Galicia (northwest Spain): Distribution, characteristics, and meaning
title Paleozoic ophiolites in the Variscan suture of Galicia (northwest Spain): Distribution, characteristics, and meaning
spellingShingle Paleozoic ophiolites in the Variscan suture of Galicia (northwest Spain): Distribution, characteristics, and meaning
Arenas Martín, Ricardo
552.3
Ophiolites
Rheic Ocean
Variscan belt
Petrología
title_short Paleozoic ophiolites in the Variscan suture of Galicia (northwest Spain): Distribution, characteristics, and meaning
title_full Paleozoic ophiolites in the Variscan suture of Galicia (northwest Spain): Distribution, characteristics, and meaning
title_fullStr Paleozoic ophiolites in the Variscan suture of Galicia (northwest Spain): Distribution, characteristics, and meaning
title_full_unstemmed Paleozoic ophiolites in the Variscan suture of Galicia (northwest Spain): Distribution, characteristics, and meaning
title_sort Paleozoic ophiolites in the Variscan suture of Galicia (northwest Spain): Distribution, characteristics, and meaning
dc.creator.none.fl_str_mv Arenas Martín, Ricardo
Martínez Catalán, José Ramón
Sánchez Martínez, Sonia
Díaz García, Florentino
Abati Gómez, Jacobo
Fernández Suárez, Javier
Andonaegui Moreno, María Del Pilar
Gómez Barreiro, Juan
author Arenas Martín, Ricardo
author_facet Arenas Martín, Ricardo
Martínez Catalán, José Ramón
Sánchez Martínez, Sonia
Díaz García, Florentino
Abati Gómez, Jacobo
Fernández Suárez, Javier
Andonaegui Moreno, María Del Pilar
Gómez Barreiro, Juan
author_role author
author2 Martínez Catalán, José Ramón
Sánchez Martínez, Sonia
Díaz García, Florentino
Abati Gómez, Jacobo
Fernández Suárez, Javier
Andonaegui Moreno, María Del Pilar
Gómez Barreiro, Juan
author2_role author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Hatcher, Robert D.
Carlson, Marvin P.
McBride, John H.
Martínez Catalán, José Ramón
Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 552.3
Ophiolites
Rheic Ocean
Variscan belt
Petrología
topic 552.3
Ophiolites
Rheic Ocean
Variscan belt
Petrología
description Allochthonous ophiolitic units in the northwestern Iberian Massif are remnants of peri-Gondwanan Paleozoic oceans sandwiched among other exotic terranes of continental and volcanic-arc derivation. All these terranes defi ne an intricate suture zone that marks the convergence and collision between Laurussia and Gondwana. The suture is defi ned by three different ophiolitic ensembles: upper ophiolitic units, lower ophiolitic units, and the Somozas mélange. The lower ophiolitic units were derived from an alternation of basalts and sediments intruded by gabbros and scarce granitoids, and they formed during the opening of a marginal basin, the Galician ocean, during Late Cambrian to Early Ordovician time. This ocean was created as a back arc by the severance of a volcanic arc that had developed at the northern margin of Gondwana and formed part of the Rheic oceanic realm. The upper ophiolitic units formed during the Early Devonian from intraoceanic subduction in the early Paleozoic lithosphere of the Rheic Ocean. These suprasubduction ophiolites were formed just before the ocean closed, preceding the collision between Gondwana and Laurussia. The Somozas mélange appears in an anomalous position at the base of the Cabo Ortegal Complex. The ophiolites involved in this tectonic mélange represent an imbricate of highly dismembered oceanic lithosphere, slivers of subducted outer edge of the Gondwanan continental margin, and Paleozoic metasediments of the northern Gondwanan platform. The ophiolites might either record the development of a different peri-Gondwanan oceanic domain, or they might be equivalent to any of the other ophiolitic ensembles, and their anomalous structural position is simply a consequence of complex thrusting.
publishDate 2007
dc.date.none.fl_str_mv 2007
2007-01-01
2007
2007-01-01
dc.type.none.fl_str_mv book part
http://purl.org/coar/resource_type/c_3248
dc.type.openaire.fl_str_mv info:eu-repo/semantics/bookPart
format bookPart
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/53785
url https://hdl.handle.net/20.500.14352/53785
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Geological Society of America
publisher.none.fl_str_mv Geological Society of America
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869409155435986944
score 15.300719

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