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Abstract:

Voluminous Paleogene magmatic rocks (44 to 29 Ma) are found in a retroarc position in the Northern Patagonian to Southern Central Andes (~ 39–42°S), whose origin remains controversial. Geochemical data in these Eocene to Oligocene volcanic associations are herein used to unravel their origin and understand changes in subduction parameters. Geochemical signatures indicate arc-related associations and reflect changing geodynamic boundary conditions of the Andean margin through time. In particular, Eocene magmatism (~ 44 Ma; Pilcaniyeu Belt) shows an alkaline-like signature and limited slab influence. Reported contemporaneous within-plate magmatism (~ 47–43 Ma) in an easternmost position reflects a more typical enriched source. Oligocene arc-like volcanism (~ 29 Ma; El Maitén Belt), which developed in an extensional retroarc setting, shows a higher contribution from slab-derived fluids and a calc-alkaline source. A comparison with younger arc-related magmas from the region (~ 26–20 Ma), emplaced in an intra- to retroarc position (Cura Mallín and Abanico basins), indicates a progressive increase in slab-signature, associated with a tholeiitic magma source. We propose that these compositional variations could be directly related to changes in plate configuration before and after the Farallon plate break-up and the initiation of a more orthogonal convergence typical of the present Andean-type subduction zone. © 2016 Elsevier B.V.

Registro:

Documento: Artículo
Título:Evolution of Eocene to Oligocene arc-related volcanism in the North Patagonian Andes (39–41°S), prior to the break-up of the Farallon plate
Autor:Iannelli, S.B.; Litvak, V.D.; Fernández Paz, L.; Folguera, A.; Ramos, M.E.; Ramos, V.A.
Filiación:Instituto de Estudios Andinos Don Pablo Groeber (IDEAN), Universidad de Buenos Aires-CONICET, Intendente Güiraldes 2160, Ciudad Universitaria, Pabellón II, Ciudad de Buenos Aires, C1428EHA, Argentina
Palabras clave:Arc volcanism; Eocene-Oligocene; Geochemistry; Patagonian Andean margin; Tectonic evolution; Geochemistry; Geodynamics; Arc volcanism; Compositional variation; Geochemical data; Geochemical signatures; Oligocene; Patagonian Andean margin; Plate configuration; Tectonic evolution; Tectonics; Eocene; geochemistry; magmatism; Oligocene; subduction zone; tectonic evolution; tectonic plate; volcanism; Andes; Patagonia
Año:2017
Volumen:696-697
Página de inicio:70
Página de fin:87
DOI: http://dx.doi.org/10.1016/j.tecto.2016.12.024
Título revista:Tectonophysics
Título revista abreviado:Tectonophysics
ISSN:00401951
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v696-697_n_p70_Iannelli

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Citas:

---------- APA ----------
Iannelli, S.B., Litvak, V.D., Fernández Paz, L., Folguera, A., Ramos, M.E. & Ramos, V.A. (2017) . Evolution of Eocene to Oligocene arc-related volcanism in the North Patagonian Andes (39–41°S), prior to the break-up of the Farallon plate. Tectonophysics, 696-697, 70-87.
http://dx.doi.org/10.1016/j.tecto.2016.12.024
---------- CHICAGO ----------
Iannelli, S.B., Litvak, V.D., Fernández Paz, L., Folguera, A., Ramos, M.E., Ramos, V.A. "Evolution of Eocene to Oligocene arc-related volcanism in the North Patagonian Andes (39–41°S), prior to the break-up of the Farallon plate" . Tectonophysics 696-697 (2017) : 70-87.
http://dx.doi.org/10.1016/j.tecto.2016.12.024
---------- MLA ----------
Iannelli, S.B., Litvak, V.D., Fernández Paz, L., Folguera, A., Ramos, M.E., Ramos, V.A. "Evolution of Eocene to Oligocene arc-related volcanism in the North Patagonian Andes (39–41°S), prior to the break-up of the Farallon plate" . Tectonophysics, vol. 696-697, 2017, pp. 70-87.
http://dx.doi.org/10.1016/j.tecto.2016.12.024
---------- VANCOUVER ----------
Iannelli, S.B., Litvak, V.D., Fernández Paz, L., Folguera, A., Ramos, M.E., Ramos, V.A. Evolution of Eocene to Oligocene arc-related volcanism in the North Patagonian Andes (39–41°S), prior to the break-up of the Farallon plate. Tectonophysics. 2017;696-697:70-87.
http://dx.doi.org/10.1016/j.tecto.2016.12.024