Flow in the western Mediterranean shallow mantle: Insights from xenoliths in Pliocene alkali basalts from SE Iberia (eastern Betics, Spain)
Mantle xenoliths in Pliocene alkali basalts of the eastern Betics (SE Iberia, Spain) are spinel ± plagioclase lherzolite, with minor harzburgite and wehrlite, displaying porphyroclastic or equigranular textures. Equigranular peridotites have olivine crystal preferred orientation (CPO) patterns simil...
| Autores: | , , , , , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2016 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/362772 |
| Acceso en línea: | http://hdl.handle.net/10261/362772 |
| Access Level: | acceso abierto |
| Palabra clave: | Eastern Betic Cordillera EBSD Mantle xenolith Seismic anisotropy Subcontinental lithospheric mantle Western Mediterranean |
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| dc.title.none.fl_str_mv |
Flow in the western Mediterranean shallow mantle: Insights from xenoliths in Pliocene alkali basalts from SE Iberia (eastern Betics, Spain) |
| title |
Flow in the western Mediterranean shallow mantle: Insights from xenoliths in Pliocene alkali basalts from SE Iberia (eastern Betics, Spain) |
| spellingShingle |
Flow in the western Mediterranean shallow mantle: Insights from xenoliths in Pliocene alkali basalts from SE Iberia (eastern Betics, Spain) Hidas, Károly Eastern Betic Cordillera EBSD Mantle xenolith Seismic anisotropy Subcontinental lithospheric mantle Western Mediterranean |
| title_short |
Flow in the western Mediterranean shallow mantle: Insights from xenoliths in Pliocene alkali basalts from SE Iberia (eastern Betics, Spain) |
| title_full |
Flow in the western Mediterranean shallow mantle: Insights from xenoliths in Pliocene alkali basalts from SE Iberia (eastern Betics, Spain) |
| title_fullStr |
Flow in the western Mediterranean shallow mantle: Insights from xenoliths in Pliocene alkali basalts from SE Iberia (eastern Betics, Spain) |
| title_full_unstemmed |
Flow in the western Mediterranean shallow mantle: Insights from xenoliths in Pliocene alkali basalts from SE Iberia (eastern Betics, Spain) |
| title_sort |
Flow in the western Mediterranean shallow mantle: Insights from xenoliths in Pliocene alkali basalts from SE Iberia (eastern Betics, Spain) |
| dc.creator.none.fl_str_mv |
Hidas, Károly Konc, Z. Garrido, Carlos J. Tommasi, A. Vauchez, A. Padrón-Navarta, J. A. Marchesi, Claudio Booth-Rea, Guillermo Acosta-Vigil, Antonio Szabó, C. Varas-Reus, Maria I. Gervilla, Fernando |
| author |
Hidas, Károly |
| author_facet |
Hidas, Károly Konc, Z. Garrido, Carlos J. Tommasi, A. Vauchez, A. Padrón-Navarta, J. A. Marchesi, Claudio Booth-Rea, Guillermo Acosta-Vigil, Antonio Szabó, C. Varas-Reus, Maria I. Gervilla, Fernando |
| author_role |
author |
| author2 |
Konc, Z. Garrido, Carlos J. Tommasi, A. Vauchez, A. Padrón-Navarta, J. A. Marchesi, Claudio Booth-Rea, Guillermo Acosta-Vigil, Antonio Szabó, C. Varas-Reus, Maria I. Gervilla, Fernando |
| author2_role |
author author author author author author author author author author author |
| dc.contributor.none.fl_str_mv |
Ministerio de Economía y Competitividad (España) Junta de Andalucía Consejo Superior de Investigaciones Científicas (España) Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72] |
| dc.subject.none.fl_str_mv |
Eastern Betic Cordillera EBSD Mantle xenolith Seismic anisotropy Subcontinental lithospheric mantle Western Mediterranean |
| topic |
Eastern Betic Cordillera EBSD Mantle xenolith Seismic anisotropy Subcontinental lithospheric mantle Western Mediterranean |
| description |
Mantle xenoliths in Pliocene alkali basalts of the eastern Betics (SE Iberia, Spain) are spinel ± plagioclase lherzolite, with minor harzburgite and wehrlite, displaying porphyroclastic or equigranular textures. Equigranular peridotites have olivine crystal preferred orientation (CPO) patterns similar to those of porphyroclastic xenoliths but slightly more dispersed. Olivine CPO shows [100]-fiber patterns characterized by strong alignment of [100]-axes subparallel to the stretching lineation and a girdle distribution of [010]-axes normal to it. This pattern is consistent with simple shear or transtensional deformation accommodated by dislocation creep. One xenolith provides evidence for synkinematic reactive percolation of subduction-related Si-rich melts/fluids that resulted in oriented crystallization of orthopyroxene. Despite a seemingly undeformed microstructure, the CPO in orthopyroxenite veins in composite xenoliths is identical to those of pyroxenes in the host peridotite, suggesting late-kinematic crystallization. Based on these observations, we propose that the annealing producing the equigranular microstructures was triggered by melt percolation in the shallow subcontinental lithospheric mantle coeval to the late Neogene formation of veins in composite xenoliths. Calculated seismic properties are characterized by fast propagation of P waves and polarization of fast S waves parallel to olivine [100]-axis (stretching lineation). These data are compatible with present-day seismic anisotropy observations in SE Iberia if the foliations in the lithospheric mantle are steeply dipping and lineations are subhorizontal with ENE strike, implying dominantly horizontal mantle flow in the ENE-WSW direction within vertical planes, that is, subparallel to the paleo-Iberian margin. The measured anisotropy could thus reflect a lithospheric fabric due to strike-slip deformation in the late Miocene in the context of WSW tearing of the subducted south Iberian margin lithosphere. |
| publishDate |
2016 |
| dc.date.none.fl_str_mv |
2016 2024 2024 2024 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article http://purl.org/coar/resource_type/c_6501 Postprint info:eu-repo/semantics/acceptedVersion |
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article |
| status_str |
acceptedVersion |
| dc.identifier.none.fl_str_mv |
http://hdl.handle.net/10261/362772 |
| url |
http://hdl.handle.net/10261/362772 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
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info:eu-repo/semantics/openAccess |
| eu_rights_str_mv |
openAccess |
| dc.publisher.none.fl_str_mv |
John Wiley & Sons American Geophysical Union |
| publisher.none.fl_str_mv |
John Wiley & Sons American Geophysical Union |
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reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC instname:Consejo Superior de Investigaciones Científicas (CSIC) |
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Consejo Superior de Investigaciones Científicas (CSIC) |
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DIGITAL.CSIC. Repositorio Institucional del CSIC |
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DIGITAL.CSIC. Repositorio Institucional del CSIC |
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1869419021923778560 |
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Flow in the western Mediterranean shallow mantle: Insights from xenoliths in Pliocene alkali basalts from SE Iberia (eastern Betics, Spain)Hidas, KárolyKonc, Z.Garrido, Carlos J.Tommasi, A.Vauchez, A.Padrón-Navarta, J. A.Marchesi, ClaudioBooth-Rea, GuillermoAcosta-Vigil, AntonioSzabó, C.Varas-Reus, Maria I.Gervilla, FernandoEastern Betic CordilleraEBSDMantle xenolithSeismic anisotropySubcontinental lithospheric mantleWestern MediterraneanMantle xenoliths in Pliocene alkali basalts of the eastern Betics (SE Iberia, Spain) are spinel ± plagioclase lherzolite, with minor harzburgite and wehrlite, displaying porphyroclastic or equigranular textures. Equigranular peridotites have olivine crystal preferred orientation (CPO) patterns similar to those of porphyroclastic xenoliths but slightly more dispersed. Olivine CPO shows [100]-fiber patterns characterized by strong alignment of [100]-axes subparallel to the stretching lineation and a girdle distribution of [010]-axes normal to it. This pattern is consistent with simple shear or transtensional deformation accommodated by dislocation creep. One xenolith provides evidence for synkinematic reactive percolation of subduction-related Si-rich melts/fluids that resulted in oriented crystallization of orthopyroxene. Despite a seemingly undeformed microstructure, the CPO in orthopyroxenite veins in composite xenoliths is identical to those of pyroxenes in the host peridotite, suggesting late-kinematic crystallization. Based on these observations, we propose that the annealing producing the equigranular microstructures was triggered by melt percolation in the shallow subcontinental lithospheric mantle coeval to the late Neogene formation of veins in composite xenoliths. Calculated seismic properties are characterized by fast propagation of P waves and polarization of fast S waves parallel to olivine [100]-axis (stretching lineation). These data are compatible with present-day seismic anisotropy observations in SE Iberia if the foliations in the lithospheric mantle are steeply dipping and lineations are subhorizontal with ENE strike, implying dominantly horizontal mantle flow in the ENE-WSW direction within vertical planes, that is, subparallel to the paleo-Iberian margin. The measured anisotropy could thus reflect a lithospheric fabric due to strike-slip deformation in the late Miocene in the context of WSW tearing of the subducted south Iberian margin lithosphere.This work was supported by the International Lithosphere Program (CC4-MEDYNA), the “Spanish Ministry of Economic and Competitiveness” (MINECO) grants CGL2013-42349 and PCIN-2015-053, and the “Junta de Andalucía” research group RNM-131. We acknowledge MINECO funding of the “Juan de la Cierva” Postdoctoral Fellowship (FPDI-2013-16253) to K.H. and the “Ramón y Cajal” Fellowship (RYC-2012-11314) to C.M. The CSIC is acknowledged for funding two JAE-Predoc fellowships to Z.K. and M.I.V.R. Fellowships and grants leading to this research have been (co)funded by the European Social Fund and the European Regional Development Fund. The data used in this paper are listed in the references, tables, and supporting information. The raw EBSD data files are available from the corresponding author upon request.John Wiley & SonsAmerican Geophysical UnionMinisterio de Economía y Competitividad (España)Junta de AndalucíaConsejo Superior de Investigaciones Científicas (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2024202420162024info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/362772reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO//CGL2013-42349-Pinfo:eu-repo/grantAgreement/MINECO//PCIN-2015-053info:eu-repo/grantAgreement/MINECO//FPDI-2013-16253info:eu-repo/grantAgreement/MINECO//RYC-2012-11314http://dx.doi.org/10.1002/2016TC004165Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3627722026-05-22T06:33:51Z |
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15,81155 |