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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. Copyright © 2007 Oxford University Press.

Registro:

Documento: Artículo
Título:The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slab
Autor:Kay, S.M.; Ardolino, A.A.; Gorring, M.L.; Ramos, V.A.
Filiación:Department of Earth and Atmospheric Sciences, Cornell University, Snee Hall, Ithaca, NY 14853, United States
Dirección Nacional de Minería and Geología, Buenos Aires, Argentina
Department of Earth and Environmental Studies, Montclair State University, Upper Montclair, NJ 07043, United States
Ciencias Exactas and Naturales, Ciudad Universitaria Pabellón II, 1428 Buenos Aires, Argentina
Palabras clave:Large igneous province (LIP); Patagonia; Plume-like upwelling; Slab interaction; Somuncura plateau; crustal contamination; large igneous province; magma chemistry; magmatism; mantle source; melting; trace element; Patagonia; South America
Año:2007
Volumen:48
Número:1
Página de inicio:43
Página de fin:77
DOI: http://dx.doi.org/10.1093/petrology/egl053
Handle:http://hdl.handle.net/20.500.12110/paper_00223530_v48_n1_p43_Kay
Título revista:Journal of Petrology
Título revista abreviado:J. Pet.
ISSN:00223530
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00223530_v48_n1_p43_Kay.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223530_v48_n1_p43_Kay

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Citas:

---------- APA ----------
Kay, S.M., Ardolino, A.A., Gorring, M.L. & Ramos, V.A. (2007) . The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slab. Journal of Petrology, 48(1), 43-77.
http://dx.doi.org/10.1093/petrology/egl053
---------- CHICAGO ----------
Kay, S.M., Ardolino, A.A., Gorring, M.L., Ramos, V.A. "The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slab" . Journal of Petrology 48, no. 1 (2007) : 43-77.
http://dx.doi.org/10.1093/petrology/egl053
---------- MLA ----------
Kay, S.M., Ardolino, A.A., Gorring, M.L., Ramos, V.A. "The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slab" . Journal of Petrology, vol. 48, no. 1, 2007, pp. 43-77.
http://dx.doi.org/10.1093/petrology/egl053
---------- VANCOUVER ----------
Kay, S.M., Ardolino, A.A., Gorring, M.L., Ramos, V.A. The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slab. J. Pet. 2007;48(1):43-77.
http://dx.doi.org/10.1093/petrology/egl053