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dc.contributor.author
Rivalenti, Giorgio
dc.contributor.author
Mazzucchelli, Maurizio
dc.contributor.author
Laurora, Angela
dc.contributor.author
Ciuffi, Sara I.A.
dc.contributor.author
Zanetti, Alberto
dc.contributor.author
Vannucci, Riccardo
dc.contributor.author
Cingolani, Carlos Alberto
dc.date.available
2019-05-08T19:32:07Z
dc.date.issued
2004-10
dc.identifier.citation
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
dc.identifier.issn
0895-9811
dc.identifier.uri
http://hdl.handle.net/11336/75899
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Pergamon-Elsevier Science Ltd
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Lithosphere
dc.subject
Melting
dc.subject
Percolation
dc.subject
Reaction
dc.subject
Slab
dc.subject.classification
Meteorología y Ciencias Atmosféricas
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
The backarc mantle lithosphere in Patagonia, South America
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-04-22T15:06:37Z
dc.journal.volume
17
dc.journal.number
2
dc.journal.pagination
121-152
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Rivalenti, Giorgio. Università di Modena e Reggio Emilia. Dipartimento di Scienze della Terra; Italia
dc.description.fil
Fil: Mazzucchelli, Maurizio. Università di Modena e Reggio Emilia. Dipartimento di Scienze della Terra; Italia
dc.description.fil
Fil: Laurora, Angela. Università di Modena e Reggio Emilia. Dipartimento di Scienze della Terra; Italia
dc.description.fil
Fil: Ciuffi, Sara I.A.. Università di Modena e Reggio Emilia. Dipartimento di Scienze della Terra; Italia
dc.description.fil
Fil: Zanetti, Alberto. Università di Pavia; Italia
dc.description.fil
Fil: Vannucci, Riccardo. Università di Pavia; Italia
dc.description.fil
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
dc.journal.title
Journal of South American Earth Sciences
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jsames.2004.05.009
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981104000343
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