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Abstract:

A series of mesosilicic volcanic centers have been studied on the San Rafael Block (SRB), 300 km to the east of the present-day volcanic arc. K-Ar ages indicate that this magmatic activity was developed in at least two stages: the older volcanic centers (~15-10 Ma) are located in the central and westernmost part of the SRB (around 36°S and 69°W) and the younger centers (8-3.5 Ma) are located in an eastern position (around 36°S and 69°30'W) with respect to the older group. These volcanic rocks have andesitic to dacitic compositions and correspond to a high-K calc-alkaline sequence as shown by their SiO2, K2O and FeO/MgO contents. Elevated Ba/La, Ba/Ta and La/Ta ratios show an arc-like signature, and primitive mantle normalized trace element diagrams show typical depletions of high field strength elements (HFSE) relative to large ion lithophile elements (LILE). Rare earth element (REE) patterns suggest pyroxene and amphibole crystallization. Geochemical data obtained for SRB volcanic rocks support the proposal for a shallow subduction zone for the latest Miocene between 34°30″-37°S. Regionally, SRB volcanism is associated with a mid-Miocene to early Pliocene eastward arc migration caused by the shallowing of the subducting slab in the South-Central Andes at these latitudes, which represents the evolution of the Payenia shallow subduction segment. Overall, middle Miocene to early Pliocene volcanism located in the Payenia back-arc shows evidence for the influence of slab-related components. The younger (8-3.5 Ma) San Rafael volcanic rocks indicate the maximum slab shallowing and the easternmost extent of slab influence in the back-arc. © 2015 Elsevier Ltd.

Registro:

Documento: Artículo
Título:Late Cenozoic calc-alkaline volcanism over the Payenia shallow subduction zone, South-Central Andean back-arc (34°30'-37°S), Argentina
Autor:Litvak, V.D.; Spagnuolo, M.G.; Folguera, A.; Poma, S.; Jones, R.E.; Ramos, V.A.
Filiación:Instituto de Estudios Andinos Don Pablo Groeber, Universidad de Buenos Aires-CONICET, Intendente Guiraldes 2160, Ciudad Univ., Pabellon II, Buenos Aires, C1428EHA, Argentina
Instituto de Geociencias Básicas y Aplicadas de Buenos Aires, Universidad de Buenos Aires-CONICET, Intendente Guiraldes 2160, Ciudad Univ., Pabellon II, Buenos Aires, C1428EHA, Argentina
Department of Earth Sciences, University of Oxford, United Kingdom
Palabras clave:Andesitic volcanism; Back-arc; Geochemistry; San Rafael Block; Shallow subduction; backarc basin; calc alkaline rock; Cenozoic; geochemistry; island arc; Miocene; Pliocene; subduction zone; volcanism; Argentina
Año:2015
Volumen:64
Página de inicio:365
Página de fin:380
DOI: http://dx.doi.org/10.1016/j.jsames.2015.09.010
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v64_n_p365_Litvak

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Citas:

---------- APA ----------
Litvak, V.D., Spagnuolo, M.G., Folguera, A., Poma, S., Jones, R.E. & Ramos, V.A. (2015) . Late Cenozoic calc-alkaline volcanism over the Payenia shallow subduction zone, South-Central Andean back-arc (34°30'-37°S), Argentina. Journal of South American Earth Sciences, 64, 365-380.
http://dx.doi.org/10.1016/j.jsames.2015.09.010
---------- CHICAGO ----------
Litvak, V.D., Spagnuolo, M.G., Folguera, A., Poma, S., Jones, R.E., Ramos, V.A. "Late Cenozoic calc-alkaline volcanism over the Payenia shallow subduction zone, South-Central Andean back-arc (34°30'-37°S), Argentina" . Journal of South American Earth Sciences 64 (2015) : 365-380.
http://dx.doi.org/10.1016/j.jsames.2015.09.010
---------- MLA ----------
Litvak, V.D., Spagnuolo, M.G., Folguera, A., Poma, S., Jones, R.E., Ramos, V.A. "Late Cenozoic calc-alkaline volcanism over the Payenia shallow subduction zone, South-Central Andean back-arc (34°30'-37°S), Argentina" . Journal of South American Earth Sciences, vol. 64, 2015, pp. 365-380.
http://dx.doi.org/10.1016/j.jsames.2015.09.010
---------- VANCOUVER ----------
Litvak, V.D., Spagnuolo, M.G., Folguera, A., Poma, S., Jones, R.E., Ramos, V.A. Late Cenozoic calc-alkaline volcanism over the Payenia shallow subduction zone, South-Central Andean back-arc (34°30'-37°S), Argentina. J. South Am. Earth Sci. 2015;64:365-380.
http://dx.doi.org/10.1016/j.jsames.2015.09.010