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The El Pozo Volcanic Complex, in the south-central Mendoza province, is formed by three maars, the first to be described in the Payenia Volcanic Province and one of the few examples in Argentina. The maars of El Pozo Volcanic Complex (1, 2 and 3) show large craters (0.97 km, 1.2 km and 0.96 km, respectively) and their depth is between 10 and 57 m below the pre-eruptive surface. Their deposits are described from the only outcrops that have been found, called El Pajarito and El Visitante. It was interpreted that the first maar to be formed would have been No. 2, from which only the deposits corresponding to El Pajarito (3.6 m) and the lower section of El Visitante (28 m) are preserved. We suggest that its shape is the result of lateral vent migration and coalescence of successive vents. Then, after a short break represented by the angular unconformity in the El Visitante section, the active vent would have shifted more to the W and the maar No.3 is thought to have been formed. The activity of this maar is represented in El Visitante upper section, with features resulting from the presence of water in the time of deposition. Maar No. 1 was probably active simultaneously with maar no. 3, with which coalesces but the lack of outcrops does not guarantee this affirmation. Towards the end of the eruptive cycle, depletion of water produced a change in activity from phreatomagmatic to Strombolian and effusive. This gave rise to the nested pyroclastic scoria cone, El Pozo cone, which lies in the maars’ 1 and 3 craters floors. El Pozo cone is related to lava flows with a tumulus and the deposit of a lapilli-bearing tephra plume. © 2019 Elsevier B.V.


Documento: Artículo
Título:El Pozo Volcanic Complex: Evolution of a group of maars, central Mendoza province, Argentina
Autor:Morales Volosín, S.; Risso, C.
Filiación:Instituto de Geociencias Básicas y Aplicadas y Ambientales de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, Ciudad Universitaria, Buenos Aires, C1428, Argentina
Palabras clave:Coalescing maars; Nested cones; Phreatomagmatic eruptions; Pyroclastic deposits; Deposits; Flocculation; Angular unconformity; Coalescing maars; Phreatomagmatic; Phreatomagmatic eruption; Presence of water; Pyroclastic deposits; Vent migration; Volcanic complex; Volcanoes; lava flow; maar; magma; outcrop; phreatomagmatism; pyroclastic deposit; tephra; volcanic eruption; Argentina; Mendoza; Hyporhamphus hildebrandi
Página de inicio:177
Página de fin:191
Título revista:Journal of Volcanology and Geothermal Research
Título revista abreviado:J. Volcanol. Geotherm. Res.


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---------- APA ----------
Morales Volosín, S. & Risso, C. (2019) . El Pozo Volcanic Complex: Evolution of a group of maars, central Mendoza province, Argentina. Journal of Volcanology and Geothermal Research, 371, 177-191.
---------- CHICAGO ----------
Morales Volosín, S., Risso, C. "El Pozo Volcanic Complex: Evolution of a group of maars, central Mendoza province, Argentina" . Journal of Volcanology and Geothermal Research 371 (2019) : 177-191.
---------- MLA ----------
Morales Volosín, S., Risso, C. "El Pozo Volcanic Complex: Evolution of a group of maars, central Mendoza province, Argentina" . Journal of Volcanology and Geothermal Research, vol. 371, 2019, pp. 177-191.
---------- VANCOUVER ----------
Morales Volosín, S., Risso, C. El Pozo Volcanic Complex: Evolution of a group of maars, central Mendoza province, Argentina. J. Volcanol. Geotherm. Res. 2019;371:177-191.