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• W2005020580 abstract "The Upper Miocene Cerro Morado Andesites constitutes a mafic volcanic field (∼100 km2) composed of andesite to basaltic andesite rocks that crop out ∼75 km to the east from the current arc, in the northern Puna of Argentina. The volcanic field comprises lavas and scoria cones resulting from three different eruptive phases developed without long interruptions between each other. Lavas and pyroclastic rocks are thought to be sourced from the same vents, located where orogen-parallel north-south faults crosscut transverse structures. The first eruptive phase involved the effusion of extensive andesitic flows, and minor Hawaiian-style fountaining which formed subordinate clastogenic lavas. The second phase represents the eruption of slightly less evolved andesite lavas and pyroclastic deposits, only distributed to the north and central sectors of the volcanic field. The third phase represents the discharge of basaltic andesite magmas which occurred as both pyroclastic eruptions and lava effusion from scattered vents distributed throughout the entire volcanic field. The interpreted facies model for scoria cones fits well with products of typical Strombolian-type activity, with minor fountaining episodes to the final stages of eruptions. Petrographic and chemical features suggest that the andesitic units (SiO2 > 57%) evolved by crystal fractionation. In contrast, characteristics of basaltic andesite rocks are inconsistent with residence in upper-crustal chambers, suggesting that batches of magmas with different origins or evolutive histories arrived at the surface and erupted coevally. Based on the eruptive styles and lack of volcanic quiescence gaps between eruptions, the Cerro Morado Andesites can be classified as a mafic volcanic field constructed from the concurrent activity of several small, probably short-lived, monogenetic centers. Las Andesitas del Cerro Morado, de edad Mioceno superior, constituyen un campo de rocas volcánicas máficas (∼100 km2) que afloran ∼75 km al este del arco actual, en la Puna norte. Este conjunto comprende tanto coladas de lava como conos de escoria, resultantes de tres distintas fases eruptivas desarrolladas sin importantes interrupciones entre ellas. La mayoría de las lavas y piroclastitas fueron eruptadas desde centros emisores comunes, localizados donde estructuras submeridianas intersectaron fallas de orientación transversal al orógeno andino. La primera fase eruptiva produjo la efusión de extensas lavas andesíticas y menores episodios de tipo hawaiano que resultaron en pequeñas coladas clastogénicas. La segunda fase representa la erupción de lavas y depósitos piroclásticos andesíticos menos evolucionados que los anteriores, distribuidos hacia los sectores norte y central del campo volcánico. La tercera fase representa la descarga de magmas andesítico-basálticos, la cual produjo tanto conos de escoria como lavas desde puntos de emisión distribuidos a lo largo de todo el campo volcánico. El modelo de facies de los conos coincide bastante bien con el de estructuras de tipo estromboliano, con episodios finales asimilables a fontanas lávicas de corta duración. Las características petrográficas y geoquímicas de las Andesitas del Cerro Morado sugieren que sólo las rocas de composición andesítica (SiO2 > 57%) evolucionaron por fraccionamiento cristalino. La composición de las rocas andesítico basálticas es en cambio incompatible con residencias prolongadas en niveles supracorticales, sugiriendo que pulsos magmáticos de diferente origen o historia evolutiva alcanzaron la superficie casi concomitantemente. Los estilos eruptivos reconocidos y la ausencia de grandes interrupciones entre erupciones permiten clasificar las Andesitas del Cerro Morado como un campo volcánico máfico, construído a partir de la actividad coetánea de varios centros monogenéticos de pequeño tamaño y probable corta vida." @default.
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• W2005020580 date "2009-08-01" @default.
• W2005020580 modified "2023-10-06" @default.
• W2005020580 title "The Cerro Morado Andesites: Volcanic history and eruptive styles of a mafic volcanic field from northern Puna, Argentina" @default.
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• W2005020580 doi "https://doi.org/10.1016/j.jsames.2009.03.007" @default.
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