Tectono-metamorphic interaction of upper mantle peridotites and lower crustal units during continental rifting in the western Betic Cordillera
[EN] Recent geological mapping conducted in the Ronda Peridotites (Betic Cordillera, S Spain) has revealed a systematic field correlation between lower crustal metamorphic units and different tectono-metamorphic domains of the ultramafic massif. Mylonitic and highly tectonized Spl ± Grt peridotites...
| Autores: | , , , , |
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| Tipo de documento: | artigo |
| Estado: | Versão publicada |
| Data de publicação: | 2024 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositório: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/367362 |
| Acesso em linha: | http://hdl.handle.net/10261/367362 https://api.elsevier.com/content/abstract/scopus_id/85192926955 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Ronda massif Betic Cordillera Continental rifting Guadaiza unit Lower-crust migmatite Mantle peridotite |
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| dc.title.none.fl_str_mv |
Tectono-metamorphic interaction of upper mantle peridotites and lower crustal units during continental rifting in the western Betic Cordillera |
| title |
Tectono-metamorphic interaction of upper mantle peridotites and lower crustal units during continental rifting in the western Betic Cordillera |
| spellingShingle |
Tectono-metamorphic interaction of upper mantle peridotites and lower crustal units during continental rifting in the western Betic Cordillera Díaz Alvarado, J. Ronda massif Betic Cordillera Continental rifting Guadaiza unit Lower-crust migmatite Mantle peridotite |
| title_short |
Tectono-metamorphic interaction of upper mantle peridotites and lower crustal units during continental rifting in the western Betic Cordillera |
| title_full |
Tectono-metamorphic interaction of upper mantle peridotites and lower crustal units during continental rifting in the western Betic Cordillera |
| title_fullStr |
Tectono-metamorphic interaction of upper mantle peridotites and lower crustal units during continental rifting in the western Betic Cordillera |
| title_full_unstemmed |
Tectono-metamorphic interaction of upper mantle peridotites and lower crustal units during continental rifting in the western Betic Cordillera |
| title_sort |
Tectono-metamorphic interaction of upper mantle peridotites and lower crustal units during continental rifting in the western Betic Cordillera |
| dc.creator.none.fl_str_mv |
Díaz Alvarado, J. González Menéndez, Luis Hidas, Károly Azor, Antonio Pedrera Parias, Antonio |
| author |
Díaz Alvarado, J. |
| author_facet |
Díaz Alvarado, J. González Menéndez, Luis Hidas, Károly Azor, Antonio Pedrera Parias, Antonio |
| author_role |
author |
| author2 |
González Menéndez, Luis Hidas, Károly Azor, Antonio Pedrera Parias, Antonio |
| author2_role |
author author author author |
| dc.contributor.none.fl_str_mv |
Agencia Estatal de Investigación (España) European Commission González Menéndez, Luis [0000-0002-7955-772X] Hidas, Károly [0000-0003-1371-0362] Azor, Antonio [0000-0003-2735-9796] Pedrera Parias, Antonio [0000-0003-1990-9292] Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72] |
| dc.subject.none.fl_str_mv |
Ronda massif Betic Cordillera Continental rifting Guadaiza unit Lower-crust migmatite Mantle peridotite |
| topic |
Ronda massif Betic Cordillera Continental rifting Guadaiza unit Lower-crust migmatite Mantle peridotite |
| description |
[EN] Recent geological mapping conducted in the Ronda Peridotites (Betic Cordillera, S Spain) has revealed a systematic field correlation between lower crustal metamorphic units and different tectono-metamorphic domains of the ultramafic massif. Mylonitic and highly tectonized Spl ± Grt peridotites (i.e., Grt-Spl mylonite and Spl tectonite domains), which are considered to be derived from a thick continental lithosphere, are in contact with garnet-bearing gneisses (i.e., kinzigites) of the Jubrique unit along a narrow but continuous mylonitic shear zone. Phase equilibrium calculations indicate that the metamorphic rocks of the Jubrique unit are consistent with an initial continental setting characterized by normal crustal thicknesses, which underwent two melting events. The first melting occurred at 0.9–1.0 GPa / 770–800 °C and resulted in 13 %melt, while the second one took place at shallower crustal conditions (0.4–0.5 GPa and 710–765 °C) and led to more restricted melt production (2–3 %melt). In contrast, the Spl ± Pl peridotites (Pl-tectonite domain), which are stable only at shallowest mantle levels within a highly extended continental lithosphere, are consistently found exposed in contact with heterogeneous granites and migmatites of the Guadaiza unit. According to new thermodynamic modeling, the Guadaiza metamorphic rocks record a single melting event characterized by a theoretical melt production of 6 to 11 % at the base of a very thin continental crust (ca. 0.3 GPa and 675–710 °C). This process was likely facilitated by influx of external water, necessary to generate high melt fractions observed in the diatexites. The systematic correlation observed between crustal metamorphic units, consistently overlaying the mantle rocks, and specific ultramafic domains of the Ronda massif, suggests that their juxtaposition primarily resulted from the severe extension of the continental lithosphere. U-Pb radiometric dating of zircons from gneisses, migmatites, and heterogeneous granites in the middle crustal rocks of the Guadaiza unit indicates that extensional processes, crustal anatexis, and melt stagnation occurred at around 280 Ma. Comparison of these new radiometric ages with previous results from the Jubrique unit suggests that a Permian high-temperature / low- to medium-pressure event uniformly affected the crustal units over the Ronda Peridotites. This event coincided with the formation of characteristic ultramafic mineral assemblages within the Ronda massif and provides evidence for the interaction between upper mantle rocks and lower- to mid-crustal metamorphic rocks during this period. |
| publishDate |
2024 |
| dc.date.none.fl_str_mv |
2024 2024 2024 |
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info:eu-repo/semantics/article http://purl.org/coar/resource_type/c_6501 Publisher's version info:eu-repo/semantics/publishedVersion |
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article |
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publishedVersion |
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http://hdl.handle.net/10261/367362 https://api.elsevier.com/content/abstract/scopus_id/85192926955 |
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http://hdl.handle.net/10261/367362 https://api.elsevier.com/content/abstract/scopus_id/85192926955 |
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Inglés |
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Inglés |
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Tectono-metamorphic interaction of upper mantle peridotites and lower crustal units during continental rifting in the western Betic CordilleraDíaz Alvarado, J.González Menéndez, LuisHidas, KárolyAzor, AntonioPedrera Parias, AntonioRonda massifBetic CordilleraContinental riftingGuadaiza unitLower-crust migmatiteMantle peridotite[EN] Recent geological mapping conducted in the Ronda Peridotites (Betic Cordillera, S Spain) has revealed a systematic field correlation between lower crustal metamorphic units and different tectono-metamorphic domains of the ultramafic massif. Mylonitic and highly tectonized Spl ± Grt peridotites (i.e., Grt-Spl mylonite and Spl tectonite domains), which are considered to be derived from a thick continental lithosphere, are in contact with garnet-bearing gneisses (i.e., kinzigites) of the Jubrique unit along a narrow but continuous mylonitic shear zone. Phase equilibrium calculations indicate that the metamorphic rocks of the Jubrique unit are consistent with an initial continental setting characterized by normal crustal thicknesses, which underwent two melting events. The first melting occurred at 0.9–1.0 GPa / 770–800 °C and resulted in 13 %melt, while the second one took place at shallower crustal conditions (0.4–0.5 GPa and 710–765 °C) and led to more restricted melt production (2–3 %melt). In contrast, the Spl ± Pl peridotites (Pl-tectonite domain), which are stable only at shallowest mantle levels within a highly extended continental lithosphere, are consistently found exposed in contact with heterogeneous granites and migmatites of the Guadaiza unit. According to new thermodynamic modeling, the Guadaiza metamorphic rocks record a single melting event characterized by a theoretical melt production of 6 to 11 % at the base of a very thin continental crust (ca. 0.3 GPa and 675–710 °C). This process was likely facilitated by influx of external water, necessary to generate high melt fractions observed in the diatexites. The systematic correlation observed between crustal metamorphic units, consistently overlaying the mantle rocks, and specific ultramafic domains of the Ronda massif, suggests that their juxtaposition primarily resulted from the severe extension of the continental lithosphere. U-Pb radiometric dating of zircons from gneisses, migmatites, and heterogeneous granites in the middle crustal rocks of the Guadaiza unit indicates that extensional processes, crustal anatexis, and melt stagnation occurred at around 280 Ma. Comparison of these new radiometric ages with previous results from the Jubrique unit suggests that a Permian high-temperature / low- to medium-pressure event uniformly affected the crustal units over the Ronda Peridotites. This event coincided with the formation of characteristic ultramafic mineral assemblages within the Ronda massif and provides evidence for the interaction between upper mantle rocks and lower- to mid-crustal metamorphic rocks during this period.This is a work by the Tectonic Processes and GeoResources Lab (IGME-CSIC) supported by the project by the MCIN/ AEI/10.13039/501100011033/. FEDER ‘Una manera de hacer Europa’ (REViSE-Betics-PID2020-119651RB-I00).Peer reviewedElsevierAgencia Estatal de Investigación (España)European CommissionGonzález Menéndez, Luis [0000-0002-7955-772X]Hidas, Károly [0000-0003-1371-0362]Azor, Antonio [0000-0003-2735-9796]Pedrera Parias, Antonio [0000-0003-1990-9292]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202420242024info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/367362https://api.elsevier.com/content/abstract/scopus_id/85192926955reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-119651RB-I00https://doi.org/10.1016/j.gr.2024.03.018Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3673622026-05-22T06:33:51Z |
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15,81155 |