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dc.contributor.author
Kay, S. Mahlburg
dc.contributor.author
Ardolino, A. A.
dc.contributor.author
Gorring, M. L.
dc.contributor.author
Ramos, Victor Alberto
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dc.date.available
2019-12-23T16:48:35Z
dc.date.issued
2007-12
dc.identifier.citation
Kay, S. Mahlburg; Ardolino, A. A.; Gorring, M. L.; Ramos, Victor Alberto; The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slab; Oxford University Press; Journal Of Petrology; 48; 1; 12-2007; 43-77
dc.identifier.issn
0022-3530
dc.identifier.uri
http://hdl.handle.net/11336/92751
dc.description.abstract
The Oligo-Miocene Somuncura province is the largest (∼55 000 km2) back-arc mafic volcanic field in Patagonia, and one of Earth's largest with no clear link to a hotspot or major extension. Major and trace element and Sr-Nd-Pb isotopic data suggest involvement of a plume-like component in the mantle magma source mixed with hydrous, but not high field strength element (HFSE)-depleted components, from a disintegrating subducting plate. Magmatism is attributed to mantle upwelling related to disturbances during plate reorganization, possibly at a time when the South America plate was nearly stationary over the underlying mantle. Melting was enhanced by hydration of the mantle during Paleogene subduction. Crustal contamination was minimal in a refractory crust that had been extensively melted in the Jurassic. Eruption began with low-volume intraplate alkaline mafic flows with depleted Nd-Sr isotopic signatures. These were followed by voluminous ∼29-25 Ma tholeiitic mafic flows with flat light and steep heavy rare earth element (REE) patterns, intraplate-like La/Ta ratios, arc-like Ba/La ratios and enriched Sr-Nd isotopic signatures. Their source can be explained by mixing EM1-Tristan da Cunha-like and depleted mantle components with subduction-related components. Post-plateau ∼24-17 Ma alkaline flows with steep REE patterns, high incompatible element abundances, and depleted Sr-Nd isotopic signatures mark the ebbing of the mantle upwelling.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Oxford University Press
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
LARGE IGNEOUS PROVINCE (LIP)
dc.subject
PATAGONIA
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PLUME-LIKE UPWELLING
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SLAB INTERACTION
dc.subject
SOMUNCURA PLATEAU
dc.subject.classification
Geología
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slab
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-11-08T15:15:35Z
dc.journal.volume
48
dc.journal.number
1
dc.journal.pagination
43-77
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Oxford
dc.description.fil
Fil: Kay, S. Mahlburg. Cornell University; Estados Unidos
dc.description.fil
Fil: Ardolino, A. A.. Dirección Nacional de Mineria y Geología; Argentina
dc.description.fil
Fil: Gorring, M. L.. Montclair State University; Estados Unidos
dc.description.fil
Fil: Ramos, Victor Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
dc.journal.title
Journal Of Petrology
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1093/petrology/egl053
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/petrology/article/48/1/43/1489017
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