Artículo

Remesal, M.; Cordenons, P.D.; Alric, V.; Cerredo, M.E. "Basalts of the northern Somún Curá Plateau. Río Negro province " (2018) Revista de la Asociacion Geologica Argentina. 75(3):396-408
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Abstract:

The basaltic Somún Curá plateau is one of the most outstanding geoforms in the northern Extrandean Patagonia; it corresponds to a Paleogene-Neogene volcanic association. The northeastern sector displays a strongly irregular outline on map view; cross sections expose a stacking of basaltic lava flows thinning northwards. To the south the basaltic volcanic sequence is covered by a younger basaltic to trachytic assemblage of the Alta Sierra de Somún Curá Volcanic Complex. Typical outcrop structures of inflated flows were recognized, as well as some intra-flow features (spiracles, lava tunnels). A new 40 Ar/ 39 Ar age is presented for the studied basalts which yielded 21,6 ± 0,5 Ma. Whole rock compositions correspond to subalkaline basalts and basaltic andesites, with low-to middle K. The studied flows correspond to olivine basalts, aphyric or poorly porphyric, composed of: olivine, clinopyroxene, plagioclase, Fe-Ti oxides and a glassy mesostasis. High temperature iddingsite replacements are common in olivine. A semiquantitative compositional characterization is presented for the main framework minerals. Classical textures indicating liquid immiscibility are observed in the mesostasis accompanied by partial devitrification (globules, skeletal crystals, etc.). A semiquantitative estimation of the unmixed siliceous liquid was acquired indicating a subalkaline rhyolite composition, of intermediate K 2 O content. © 2018, Asociacion Geologica Argentina. All rights reserved.

Registro:

Documento: Artículo
Título:Basalts of the northern Somún Curá Plateau. Río Negro province
Autor:Remesal, M.; Cordenons, P.D.; Alric, V.; Cerredo, M.E.
Filiación:Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGeBA-CONICET), Departamento de Ciencias Geológicas, FCEN-UBA. Pabellón II, Ciudad Universitaria, Ciudad Autónoma de Buenos Aires, Argentina
Universidad Nacional de la Patagonia San Juan Bosco, Departamento de Geología, Puerto Madryn, Argentina
Palabras clave:Age; Basalts; Inflated lava flows; Liquid immiscibility texture; Somún Curá plateau
Año:2018
Volumen:75
Número:3
Página de inicio:396
Página de fin:408
Título revista:Revista de la Asociacion Geologica Argentina
Título revista abreviado:Rev. Asoc. Geol. Argent.
ISSN:00044822
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v75_n3_p396_Remesal

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Citas:

---------- APA ----------
Remesal, M., Cordenons, P.D., Alric, V. & Cerredo, M.E. (2018) . Basalts of the northern Somún Curá Plateau. Río Negro province . Revista de la Asociacion Geologica Argentina, 75(3), 396-408.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v75_n3_p396_Remesal [ ]
---------- CHICAGO ----------
Remesal, M., Cordenons, P.D., Alric, V., Cerredo, M.E. "Basalts of the northern Somún Curá Plateau. Río Negro province " . Revista de la Asociacion Geologica Argentina 75, no. 3 (2018) : 396-408.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v75_n3_p396_Remesal [ ]
---------- MLA ----------
Remesal, M., Cordenons, P.D., Alric, V., Cerredo, M.E. "Basalts of the northern Somún Curá Plateau. Río Negro province " . Revista de la Asociacion Geologica Argentina, vol. 75, no. 3, 2018, pp. 396-408.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v75_n3_p396_Remesal [ ]
---------- VANCOUVER ----------
Remesal, M., Cordenons, P.D., Alric, V., Cerredo, M.E. Basalts of the northern Somún Curá Plateau. Río Negro province . Rev. Asoc. Geol. Argent. 2018;75(3):396-408.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v75_n3_p396_Remesal [ ]