The backarc mantle lithosphere in Patagonia, South America

Autores
Rivalenti, Giorgio; Mazzucchelli, Maurizio; Laurora, Angela; Ciuffi, Sara I.A.; Zanetti, Alberto; Vannucci, Riccardo; Cingolani, Carlos Alberto
Año de publicación
2004
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The backarc Patagonia mantle underwent pervasive regional re-crystallisation that left only remnants of the pre-existing mantle. Anhydrous xenoliths (dominantly lherzolites and harzburgites, few dunites) are predominant. Xenoliths containing hydrous phases (lherzolites and harzburgites, rare wehrlites) abundantly occur only at G. Gregores. Bulk-rock and clinopyroxene trace element patterns range from predominant LREE-depleted, LILE-enriched and variably Nb-depleted, to LREE-enriched patterns, with negative Zr, Hf and Ti spikes when amphibole is present. V-shaped trace element patterns are found only in rare non-recrystallised xenoliths. Trace element abundances in potential melts calculated from clinopyroxene are similar to arc magmas, but in southern Patagonia fade eastwards to E-MORB-like compositions. Trace element characteristics of bulk-rock and pyroxenes are interpreted as the consequence of two processes: (1) melting in the region of thermal inversion of the wedge, triggered by infiltration of hydrous components; (2) reactive porous flow of the melts into the overlaying mantle. The component triggering melting is inferred to be slab-derived in the western occurrences and a garnet-facies, asthenosphere-derived melt in the eastern occurrences as a consequence of wedge thickening. Differences between northern and southern Patagonia are interpreted to be due to variable contribution of slab components to the wedge. Compared to the southern region, slab-derived melts are tentatively attributed to the subduction of older and colder segments of the Nazca plate in the North. © 2004 Elsevier Ltd. All rights reserved.
Fil: Rivalenti, Giorgio. Università di Modena e Reggio Emilia. Dipartimento di Scienze della Terra; Italia
Fil: Mazzucchelli, Maurizio. Università di Modena e Reggio Emilia. Dipartimento di Scienze della Terra; Italia
Fil: Laurora, Angela. Università di Modena e Reggio Emilia. Dipartimento di Scienze della Terra; Italia
Fil: Ciuffi, Sara I.A.. Università di Modena e Reggio Emilia. Dipartimento di Scienze della Terra; Italia
Fil: Zanetti, Alberto. Università di Pavia; Italia
Fil: Vannucci, Riccardo. Università di Pavia; Italia
Fil: Cingolani, Carlos Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Materia
Lithosphere
Melting
Percolation
Reaction
Slab
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/75899
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/75899
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling The backarc mantle lithosphere in Patagonia, South AmericaRivalenti, GiorgioMazzucchelli, MaurizioLaurora, AngelaCiuffi, Sara I.A.Zanetti, AlbertoVannucci, RiccardoCingolani, Carlos AlbertoLithosphereMeltingPercolationReactionSlabhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The backarc Patagonia mantle underwent pervasive regional re-crystallisation that left only remnants of the pre-existing mantle. Anhydrous xenoliths (dominantly lherzolites and harzburgites, few dunites) are predominant. Xenoliths containing hydrous phases (lherzolites and harzburgites, rare wehrlites) abundantly occur only at G. Gregores. Bulk-rock and clinopyroxene trace element patterns range from predominant LREE-depleted, LILE-enriched and variably Nb-depleted, to LREE-enriched patterns, with negative Zr, Hf and Ti spikes when amphibole is present. V-shaped trace element patterns are found only in rare non-recrystallised xenoliths. Trace element abundances in potential melts calculated from clinopyroxene are similar to arc magmas, but in southern Patagonia fade eastwards to E-MORB-like compositions. Trace element characteristics of bulk-rock and pyroxenes are interpreted as the consequence of two processes: (1) melting in the region of thermal inversion of the wedge, triggered by infiltration of hydrous components; (2) reactive porous flow of the melts into the overlaying mantle. The component triggering melting is inferred to be slab-derived in the western occurrences and a garnet-facies, asthenosphere-derived melt in the eastern occurrences as a consequence of wedge thickening. Differences between northern and southern Patagonia are interpreted to be due to variable contribution of slab components to the wedge. Compared to the southern region, slab-derived melts are tentatively attributed to the subduction of older and colder segments of the Nazca plate in the North. © 2004 Elsevier Ltd. All rights reserved.Fil: Rivalenti, Giorgio. Università di Modena e Reggio Emilia. Dipartimento di Scienze della Terra; ItaliaFil: Mazzucchelli, Maurizio. Università di Modena e Reggio Emilia. Dipartimento di Scienze della Terra; ItaliaFil: Laurora, Angela. Università di Modena e Reggio Emilia. Dipartimento di Scienze della Terra; ItaliaFil: Ciuffi, Sara I.A.. Università di Modena e Reggio Emilia. Dipartimento di Scienze della Terra; ItaliaFil: Zanetti, Alberto. Università di Pavia; ItaliaFil: Vannucci, Riccardo. Università di Pavia; ItaliaFil: Cingolani, Carlos Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaPergamon-Elsevier Science Ltd2004-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/75899Rivalenti, Giorgio; Mazzucchelli, Maurizio; Laurora, Angela; Ciuffi, Sara I.A.; Zanetti, Alberto; et al.; The backarc mantle lithosphere in Patagonia, South America; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 17; 2; 10-2004; 121-1520895-9811CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2004.05.009info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981104000343info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-17T11:12:34Zoai:ri.conicet.gov.ar:11336/75899instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-17 11:12:34.966CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The backarc mantle lithosphere in Patagonia, South America
title The backarc mantle lithosphere in Patagonia, South America
spellingShingle The backarc mantle lithosphere in Patagonia, South America
Rivalenti, Giorgio
Lithosphere
Melting
Percolation
Reaction
Slab
title_short The backarc mantle lithosphere in Patagonia, South America
title_full The backarc mantle lithosphere in Patagonia, South America
title_fullStr The backarc mantle lithosphere in Patagonia, South America
title_full_unstemmed The backarc mantle lithosphere in Patagonia, South America
title_sort The backarc mantle lithosphere in Patagonia, South America
dc.creator.none.fl_str_mv Rivalenti, Giorgio
Mazzucchelli, Maurizio
Laurora, Angela
Ciuffi, Sara I.A.
Zanetti, Alberto
Vannucci, Riccardo
Cingolani, Carlos Alberto
author Rivalenti, Giorgio
author_facet Rivalenti, Giorgio
Mazzucchelli, Maurizio
Laurora, Angela
Ciuffi, Sara I.A.
Zanetti, Alberto
Vannucci, Riccardo
Cingolani, Carlos Alberto
author_role author
author2 Mazzucchelli, Maurizio
Laurora, Angela
Ciuffi, Sara I.A.
Zanetti, Alberto
Vannucci, Riccardo
Cingolani, Carlos Alberto
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Lithosphere
Melting
Percolation
Reaction
Slab
topic Lithosphere
Melting
Percolation
Reaction
Slab
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The backarc Patagonia mantle underwent pervasive regional re-crystallisation that left only remnants of the pre-existing mantle. Anhydrous xenoliths (dominantly lherzolites and harzburgites, few dunites) are predominant. Xenoliths containing hydrous phases (lherzolites and harzburgites, rare wehrlites) abundantly occur only at G. Gregores. Bulk-rock and clinopyroxene trace element patterns range from predominant LREE-depleted, LILE-enriched and variably Nb-depleted, to LREE-enriched patterns, with negative Zr, Hf and Ti spikes when amphibole is present. V-shaped trace element patterns are found only in rare non-recrystallised xenoliths. Trace element abundances in potential melts calculated from clinopyroxene are similar to arc magmas, but in southern Patagonia fade eastwards to E-MORB-like compositions. Trace element characteristics of bulk-rock and pyroxenes are interpreted as the consequence of two processes: (1) melting in the region of thermal inversion of the wedge, triggered by infiltration of hydrous components; (2) reactive porous flow of the melts into the overlaying mantle. The component triggering melting is inferred to be slab-derived in the western occurrences and a garnet-facies, asthenosphere-derived melt in the eastern occurrences as a consequence of wedge thickening. Differences between northern and southern Patagonia are interpreted to be due to variable contribution of slab components to the wedge. Compared to the southern region, slab-derived melts are tentatively attributed to the subduction of older and colder segments of the Nazca plate in the North. © 2004 Elsevier Ltd. All rights reserved.
Fil: Rivalenti, Giorgio. Università di Modena e Reggio Emilia. Dipartimento di Scienze della Terra; Italia
Fil: Mazzucchelli, Maurizio. Università di Modena e Reggio Emilia. Dipartimento di Scienze della Terra; Italia
Fil: Laurora, Angela. Università di Modena e Reggio Emilia. Dipartimento di Scienze della Terra; Italia
Fil: Ciuffi, Sara I.A.. Università di Modena e Reggio Emilia. Dipartimento di Scienze della Terra; Italia
Fil: Zanetti, Alberto. Università di Pavia; Italia
Fil: Vannucci, Riccardo. Università di Pavia; Italia
Fil: Cingolani, Carlos Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
description The backarc Patagonia mantle underwent pervasive regional re-crystallisation that left only remnants of the pre-existing mantle. Anhydrous xenoliths (dominantly lherzolites and harzburgites, few dunites) are predominant. Xenoliths containing hydrous phases (lherzolites and harzburgites, rare wehrlites) abundantly occur only at G. Gregores. Bulk-rock and clinopyroxene trace element patterns range from predominant LREE-depleted, LILE-enriched and variably Nb-depleted, to LREE-enriched patterns, with negative Zr, Hf and Ti spikes when amphibole is present. V-shaped trace element patterns are found only in rare non-recrystallised xenoliths. Trace element abundances in potential melts calculated from clinopyroxene are similar to arc magmas, but in southern Patagonia fade eastwards to E-MORB-like compositions. Trace element characteristics of bulk-rock and pyroxenes are interpreted as the consequence of two processes: (1) melting in the region of thermal inversion of the wedge, triggered by infiltration of hydrous components; (2) reactive porous flow of the melts into the overlaying mantle. The component triggering melting is inferred to be slab-derived in the western occurrences and a garnet-facies, asthenosphere-derived melt in the eastern occurrences as a consequence of wedge thickening. Differences between northern and southern Patagonia are interpreted to be due to variable contribution of slab components to the wedge. Compared to the southern region, slab-derived melts are tentatively attributed to the subduction of older and colder segments of the Nazca plate in the North. © 2004 Elsevier Ltd. All rights reserved.
publishDate 2004
dc.date.none.fl_str_mv 2004-10
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/75899
Rivalenti, Giorgio; Mazzucchelli, Maurizio; Laurora, Angela; Ciuffi, Sara I.A.; Zanetti, Alberto; et al.; The backarc mantle lithosphere in Patagonia, South America; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 17; 2; 10-2004; 121-152
0895-9811
CONICET Digital
CONICET
url http://hdl.handle.net/11336/75899
identifier_str_mv Rivalenti, Giorgio; Mazzucchelli, Maurizio; Laurora, Angela; Ciuffi, Sara I.A.; Zanetti, Alberto; et al.; The backarc mantle lithosphere in Patagonia, South America; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 17; 2; 10-2004; 121-152
0895-9811
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2004.05.009
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981104000343
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.001348

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