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Abstract:

A Miocene to Pliocene (13 to 4.6 Ma) mostly pyroclastic sequence is exposed along the Iglesia Valley, to the east of the former main volcanic arc. This area is a transitional region between Cordillera Frontal and Precordillera, over the flat slab segment of the Southern Central Andes, at 29°30' S to 30°00' S. New radiometric ages, geochemical data, petrography and field relationships are evaluated to establish differences and similarities between Miocene arc-related sequences across the main arc and its expansion towards a back arc position, in western Precordillera. Analyzed rocks have a magmatic arc signature partially like the former main volcanic arc to the west. The Iglesia Valley rocks are LREE-enriched (La/Sm: 3.7-6.5) with respect to HREE (Sm/Yb: 2.2-6.0) and define patterns with a pronounced slope. Sm/Yb ratios generally increase with time, as pressures increase, with retention of HREE in residual mineralogy, particularly garnet at Sm/Yb>4. Volcanic activity in Cordillera Frontal and the volcanic-volcaniclastic expression in Precordillera show a continuous increase in the La/Yb ratio with decreasing age. Variations in the residual mineral phase equilibrating with magmas would be related to the progressive increase in crustal thickness due to the tectonic compressive regime resulting from shallow subduction since Middle Miocene. The data presented suggest that the arc magmatic activity during the Miocene was expanded notably to the East in relation to the location of the main arc at Valle del Cura, in Cordillera Frontal. The extensive amplitude of the volcanic arc activity is indicative of the slab gradual flattening. Particularly, the mantle-derived magmas from Lomas del Campanario Formation (Western Precordillera) are enriched by subduction related fluids but also by crustal components. It is interpreted that the cause of the geochemical differences between the back arc position rocks and the main arc lay in the heterogeneous composition of the underlying continental crust involved in both locations. Presence of volcanic rocks with adakitic geochemical affinity probably reflect astenospheric-derived melts that interacted through a heterogeneous and thickened crust toward the surface. © 2017, Servicio Nacional de Geologia y Mineria. All rights reserved.

Registro:

Documento: Artículo
Título:Southern central andes neogene magmatism over the pampean flat slab: Implications on crustal and slab melts contribution to magma generation in Precordillera, Western Argentina
Autor:Poma, S.; Ramos, A.; Litvak, V.D.; Quenardelle, S.; Maisonnave, E.B.; Díaz, I.
Filiación:Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Ciencias Geológicas, Pabellón II, Ciudad Universitaria, Intendente Guiraldes 2160, Núñez, Buenos Aires, C1428 EGA, Argentina
CONICET-Universidad de Buenos Aires, Instituto de Geociencias Básicas y Aplicadas de Buenos Aires (IGEBA), Pabellón II, Ciudad Universitaria, Intendente Guiraldes 2160, Núñez, Buenos Aires, C1428 EGA, Argentina
CONICET-Universidad de Buenos Aires, Instituto de Estudios Andinos Don Pablo Groeber (IDEAN), Pabellón II, Ciudad Universitaria, Intendente Guiraldes 2160, Núñez, Buenos Aires, C1428 EGA, Argentina
Servicio Geológico Minero Argentino (SEGEMAR), Delegación San Juan, Sargento Cabral 685 (Oeste), San Juan, 5400, Argentina
Palabras clave:Arc expansion; Geochemistry; Miocene magmatism; Radiometric age; Shallow subduction; crustal thickness; igneous geochemistry; island arc; magma; magmatism; melt; Miocene; petrography; radiometric method; slab; subduction zone; Andes; Argentina; Cordillera Frontal; Precordillera; San Juan [Argentina]; Valle del Cura; Coscinodiscophyceae; Cura; Lonchocarpus glaucifolius
Año:2017
Volumen:44
Número:3
Página de inicio:249
Página de fin:274
DOI: http://dx.doi.org/10.5027/andgeov44n3-a02
Título revista:Andean Geology
Título revista abreviado:Andean Geol.
ISSN:07187092
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v44_n3_p249_Poma

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Citas:

---------- APA ----------
Poma, S., Ramos, A., Litvak, V.D., Quenardelle, S., Maisonnave, E.B. & Díaz, I. (2017) . Southern central andes neogene magmatism over the pampean flat slab: Implications on crustal and slab melts contribution to magma generation in Precordillera, Western Argentina . Andean Geology, 44(3), 249-274.
http://dx.doi.org/10.5027/andgeov44n3-a02
---------- CHICAGO ----------
Poma, S., Ramos, A., Litvak, V.D., Quenardelle, S., Maisonnave, E.B., Díaz, I. "Southern central andes neogene magmatism over the pampean flat slab: Implications on crustal and slab melts contribution to magma generation in Precordillera, Western Argentina " . Andean Geology 44, no. 3 (2017) : 249-274.
http://dx.doi.org/10.5027/andgeov44n3-a02
---------- MLA ----------
Poma, S., Ramos, A., Litvak, V.D., Quenardelle, S., Maisonnave, E.B., Díaz, I. "Southern central andes neogene magmatism over the pampean flat slab: Implications on crustal and slab melts contribution to magma generation in Precordillera, Western Argentina " . Andean Geology, vol. 44, no. 3, 2017, pp. 249-274.
http://dx.doi.org/10.5027/andgeov44n3-a02
---------- VANCOUVER ----------
Poma, S., Ramos, A., Litvak, V.D., Quenardelle, S., Maisonnave, E.B., Díaz, I. Southern central andes neogene magmatism over the pampean flat slab: Implications on crustal and slab melts contribution to magma generation in Precordillera, Western Argentina . Andean Geol. 2017;44(3):249-274.
http://dx.doi.org/10.5027/andgeov44n3-a02