Geomorphology and spatial distribution of monogenetic volcanoes in the southern Puna Plateau (NW Argentina)
| Autor: | Carlos Augusto Sommer, Maurício Barcelos Haag, Walter Ariel Baez, José Marcelo Arnosio, Ruben Eduardo Filipovich |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Cinder cone
geography geography.geographical_feature_category Plateau 010504 meteorology & atmospheric sciences Landform Lava dome Context (language use) SPATIAL ANALYSIS 010502 geochemistry & geophysics 01 natural sciences SOUTHERN PUNA PLATEAU Ciencias de la Tierra y relacionadas con el Medio Ambiente Tectonics Vulcanología Volcano MONOGENETIC VOLCANISM Mafic Geomorphology Geology CIENCIAS NATURALES Y EXACTAS 0105 earth and related environmental sciences Earth-Surface Processes GEOGRAPHIC INFORMATION SYSTEM |
| Popis: | Monogenetic volcanoes are the most common volcanic landforms on Earth. Several works have shown that the study of geomorphology and spatial distribution of such small volcanoes reveals important aspects related to the volcanic field, from eruption dynamics to tectonic processes. The Altiplano-Puna Plateau (15° to 27° S, Central Andes) comprises the largest non-collisional plateau on Earth. Characterized by intensive deformation, uplift, and volcanism, this region is marked by the presence of hundreds of mafic monogenetic volcanoes. Despite its discrete occurrence, the monogenetic volcanoes show a close relationship with large scale, lithospheric foundering events in the region. In this contribution we applied a Geographic Information System (GIS) approach in order to build the first complete catalog of monogenetic landforms present in the southern Puna Plateau (24° 30′ to 27° 00′ S, NW Argentina), exploring their evolution and relationship with geotectonic events. Combining spatial analysis with a geomorphological study of each volcano, it was possible to identify the presence of 285 monogenetic volcanoes in the region, which could be grouped in seven clusters. Southern Puna shows a predominance of cinder cones and lava domes, suggesting a small influence of water in the eruption dynamics. Despite its high clustering degree, southern Puna monogenetic vents present a low density (8.3 × 10−3 vents/km2 ) when compared to other monogenetic fields around the world. In addition, Puna Plateau cones show a close relationship with monogenetic cones associated with an extensional environment, considering their back-arc context. Based on relative and available absolute ages, it was possible to map the volcanism evolution through time. The results indicate that the first monogenetic volcanoes appeared in the central region of the Plateau (Sierra de Calalaste), mainly associated with large-scale NNE-SSW reactivated faults. The activity then expanded (Antofalla and Antofagasta regions) and, finally reached the borders of the Plateau (Pasto Ventura and Arizaro regions), which show volcanoes associated with NW-SE normal faults. Fil: Haag, Maurício Barcelos. Universidade Federal do Rio Grande do Sul; Brasil Fil: Baez, Walter Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Bio y Geociencias del NOA. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Museo de Ciencias Naturales. Instituto de Bio y Geociencias del NOA; Argentina Fil: Sommer, Carlos Augusto. Universidade Federal do Rio Grande do Sul; Brasil Fil: Arnosio, José Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Bio y Geociencias del NOA. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Museo de Ciencias Naturales. Instituto de Bio y Geociencias del NOA; Argentina Fil: Filipovich, Ruben Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Bio y Geociencias del NOA. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Museo de Ciencias Naturales. Instituto de Bio y Geociencias del NOA; Argentina |
| Databáze: | OpenAIRE |
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