Eclogite inclusions from subducted metaigneous continental crust (Malpica-Tui Allochthonous Complex, NW Spain): Petrofabric, geochronology, and calculated seismic properties

This study describes the strain geometry, crystal‐plastic deformational features, isotopic age of metamorphism, and calculated seismic properties of two medium‐temperature eclogite types from the Malpica‐Tui Allochthonous Complex of Variscan NW Iberia. The eclogite types are eclogites with coronitic...

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Autores: Puelles, P., Beranoaguirre de Miguel, Aratz, Ábalos, B., Gil Ibarguchi, J. I., García de Madinabeitia, S., Rodríguez, J., Fernández-Armas, S.
Tipo de recurso: artículo
Fecha de publicación:2017
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/276820
Acceso en línea:http://hdl.handle.net/10261/276820
https://doi.org/10.1002/2016TC004367
Access Level:acceso abierto
Palabra clave:eclogite
omphacite
seismic anisotropy
subduction channel
Malpica‐Tui
NW Iberia
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spelling Eclogite inclusions from subducted metaigneous continental crust (Malpica-Tui Allochthonous Complex, NW Spain): Petrofabric, geochronology, and calculated seismic propertiesPuelles, P.Beranoaguirre de Miguel, AratzÁbalos, B.Gil Ibarguchi, J. I.García de Madinabeitia, S.Rodríguez, J.Fernández-Armas, S.eclogiteomphaciteseismic anisotropysubduction channelMalpica‐TuiNW IberiaThis study describes the strain geometry, crystal‐plastic deformational features, isotopic age of metamorphism, and calculated seismic properties of two medium‐temperature eclogite types from the Malpica‐Tui Allochthonous Complex of Variscan NW Iberia. The eclogite types are eclogites with coronitic garnets and eclogites with a planolinear fabric. Both of them were buried, deformed and recrystallized under maximum pressure and temperature of 2.6 GPa and 610–640°C, and subsequently exhumed in a late Devonian subduction channel. The metamorphic peak of the subduction‐exhumation cycle occurred ~375 Ma ago. Omphacite petrofabric ties eclogites with coronitic garnet to noncoaxial constrictional strain and eclogites with planolinear fabrics to noncoaxial flattening strain and stretching along the lineation. We also used omphacite crystallographic preferred orientations to calculate and constrain the seismic properties of the eclogites. The slight variations in petrophysical properties observed are interpreted to result from variations in the strain regime recorded by pristine eclogites, or from variations in the modal proportions of the constituent high‐pressure minerals. We foresee that eclogite in subduction metamorphic complexes might be either seismically undetectable or detected as planar features with high impedance contrasts relative to their host rocks.Departamento de Geodinámica, Universidad del País Vasco, EspañaÁrea de Laboratorios, Instituto Geológico y Minero de España, EspañaDepartamento de Mineralogía y Petrología, Universidad del País Vasco, EspañaServicio General de Geocronología y Geoquímica Isotópica, Universidad del País Vasco, EspañaServicio General de Microscopía y Microanálisis de Materiales, Universidad del País Vasco, EspañaEuropean Geosciences UnionAmerican Geophysical UnionJohn Wiley & SonsMinisterio de Economía y Competitividad (España)Universidad del País VascoEuropean Commission202220222017info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/276820https://doi.org/10.1002/2016TC004367reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#CGL2015-63530-PGIU15/05https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1002/2016TC004367info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2768202026-05-22T06:33:51Z
dc.title.none.fl_str_mv Eclogite inclusions from subducted metaigneous continental crust (Malpica-Tui Allochthonous Complex, NW Spain): Petrofabric, geochronology, and calculated seismic properties
title Eclogite inclusions from subducted metaigneous continental crust (Malpica-Tui Allochthonous Complex, NW Spain): Petrofabric, geochronology, and calculated seismic properties
spellingShingle Eclogite inclusions from subducted metaigneous continental crust (Malpica-Tui Allochthonous Complex, NW Spain): Petrofabric, geochronology, and calculated seismic properties
Puelles, P.
eclogite
omphacite
seismic anisotropy
subduction channel
Malpica‐Tui
NW Iberia
title_short Eclogite inclusions from subducted metaigneous continental crust (Malpica-Tui Allochthonous Complex, NW Spain): Petrofabric, geochronology, and calculated seismic properties
title_full Eclogite inclusions from subducted metaigneous continental crust (Malpica-Tui Allochthonous Complex, NW Spain): Petrofabric, geochronology, and calculated seismic properties
title_fullStr Eclogite inclusions from subducted metaigneous continental crust (Malpica-Tui Allochthonous Complex, NW Spain): Petrofabric, geochronology, and calculated seismic properties
title_full_unstemmed Eclogite inclusions from subducted metaigneous continental crust (Malpica-Tui Allochthonous Complex, NW Spain): Petrofabric, geochronology, and calculated seismic properties
title_sort Eclogite inclusions from subducted metaigneous continental crust (Malpica-Tui Allochthonous Complex, NW Spain): Petrofabric, geochronology, and calculated seismic properties
dc.creator.none.fl_str_mv Puelles, P.
Beranoaguirre de Miguel, Aratz
Ábalos, B.
Gil Ibarguchi, J. I.
García de Madinabeitia, S.
Rodríguez, J.
Fernández-Armas, S.
author Puelles, P.
author_facet Puelles, P.
Beranoaguirre de Miguel, Aratz
Ábalos, B.
Gil Ibarguchi, J. I.
García de Madinabeitia, S.
Rodríguez, J.
Fernández-Armas, S.
author_role author
author2 Beranoaguirre de Miguel, Aratz
Ábalos, B.
Gil Ibarguchi, J. I.
García de Madinabeitia, S.
Rodríguez, J.
Fernández-Armas, S.
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Economía y Competitividad (España)
Universidad del País Vasco
European Commission
dc.subject.none.fl_str_mv eclogite
omphacite
seismic anisotropy
subduction channel
Malpica‐Tui
NW Iberia
topic eclogite
omphacite
seismic anisotropy
subduction channel
Malpica‐Tui
NW Iberia
description This study describes the strain geometry, crystal‐plastic deformational features, isotopic age of metamorphism, and calculated seismic properties of two medium‐temperature eclogite types from the Malpica‐Tui Allochthonous Complex of Variscan NW Iberia. The eclogite types are eclogites with coronitic garnets and eclogites with a planolinear fabric. Both of them were buried, deformed and recrystallized under maximum pressure and temperature of 2.6 GPa and 610–640°C, and subsequently exhumed in a late Devonian subduction channel. The metamorphic peak of the subduction‐exhumation cycle occurred ~375 Ma ago. Omphacite petrofabric ties eclogites with coronitic garnet to noncoaxial constrictional strain and eclogites with planolinear fabrics to noncoaxial flattening strain and stretching along the lineation. We also used omphacite crystallographic preferred orientations to calculate and constrain the seismic properties of the eclogites. The slight variations in petrophysical properties observed are interpreted to result from variations in the strain regime recorded by pristine eclogites, or from variations in the modal proportions of the constituent high‐pressure minerals. We foresee that eclogite in subduction metamorphic complexes might be either seismically undetectable or detected as planar features with high impedance contrasts relative to their host rocks.
publishDate 2017
dc.date.none.fl_str_mv 2017
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/276820
https://doi.org/10.1002/2016TC004367
url http://hdl.handle.net/10261/276820
https://doi.org/10.1002/2016TC004367
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
CGL2015-63530-P
GIU15/05
https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1002/2016TC004367
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv European Geosciences Union
American Geophysical Union
John Wiley & Sons
publisher.none.fl_str_mv European Geosciences Union
American Geophysical Union
John Wiley & Sons
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869404274448924672
score 15,198674

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