+1 Recommend
1 collections
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Compositional variations revealed by ASTER image analysis of the Viedma Volcano, southern Andes Volcanic Zone Translated title: Variaciones composicionales reveladas mediante análisis de imágenes ASTER del volcán Viedma, Zona Volcánica Andina Austral


      Read this article at

          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.


          We conducted a lithological mapping of the Viedma volcano, one of five volcanoes in the Andean Austral Volcanic Zone (AVZ), using remote sensing techniques. We used data of the Advanced Spaceborne Thermal Emission and Reflection radiometer (ASTER) sensor which is highly effective in geological research, to understand build-up processes and to deduce compositional variation of the Viedma volcano emerging from the South Patagonian ice field. The volcanic edifice was divided into bright parts that mainly compose the eastern flank of the volcano and dark parts at the central crater area based on the observation in visible and near infrared ranges. The SiO2 concentration was cal-culated using the bands in the visible and thermal infrared regions. The dark part and the bright part have approximately 51 wt% and 63 wt% average SiO2 content respectively, indicating that the exposures of the Viedma volcano have a wide variation in SiO2 concentration. Although, according to other authors, ejecta from the Viedma volcano have 64-66 wt% SiO2 and other AV Z volcanoes are essentially monolithologic dacite/andesite volcanoes, the edifice of the Viedma volcano appears to be composed mostly of basalts or older rocks/basement with low silica contents.

          Translated abstract

          Mediante el uso de técnica de sensoría remota se ha desarrollado un mapeo litológico del volcán Viedma, uno de los cinco volcanes de la Zona Volcánica Andina Austral (ZVA). Para este efecto, se ha utilizado el radiómetro ‘Advanced Spaceborne Thermal Emission and Reflection’ (ASTER) que es muy efectivo en investigación geológica, para entender los procesos que han controlado la estructura y deducir las variaciones composi-cionales del volcán Viedma, que sobresale levemente de la superficie del campo de hielo Patagónico Sur. Sobre la base de la observación en el intervalo del espectro visible e infrarrojo cercano, en el edificio se distinguen partes brillantes que corresponden al flanco oriental del volcán y partes oscuras en el área del cráter central. La concentración de SiO2 se calculó a través del uso de las bandas en las regiones visibles e infrarrojo termal. Las partes oscura y brillante tienen un promedio aproximado de 51% y 63% de SiO2 en peso, respectivamente, lo que indica que el volcán Viedma expone una amplia diferenciación de las concentraciones de SiO2. Aunque, según otros autores, las muestras analizadas de material piroclástico del volcán Viedma tienen contenidos de 64-66% SiO2 y que otros aparatos de la ZVA son volcanes esencialmente monolitológicos dacíticos/andesíticos, el edificio del volcán Viedma estaría compuesto principalmente de basaltos o las rocas más antiguas de su basamento tienen un bajo contenido de sílice.

          Related collections

          Most cited references11

          • Record: found
          • Abstract: not found
          • Article: not found

          Infrared emissivities of silicates: Experimental results and a cloudy atmosphere model of Spectral emission from condensed particulate mediums

            • Record: found
            • Abstract: not found
            • Article: not found

            The behavior of spectral features in the infrared emission from particulate surfaces of various grain sizes

              • Record: found
              • Abstract: not found
              • Article: not found

              Active Andean Volcanism: its geologic and tectonic Setting


                Author and article information

                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Andean geology
                Servicio Nacional de Geología y Minería (SERNAGEOMIN) (Santiago )
                July 2010
                : 37
                : 2
                : 433-441
                [1 ] Earth Remote Sensing Data Analysis Center Japan
                [2 ] University of Tokyo Japan
                [3 ] Kanagawa Prefectural Museum of Natural History Japan
                [4 ] Servicio Nacional de Geología y Minería Chile
                [5 ] Dia Consultants Company Limited Japan
                [6 ] University of Tsukuba Japan



                SciELO Chile

                Self URI (journal page): http://www.scielo.cl/scielo.php?script=sci_serial&pid=0718-7106&lng=en

                General geosciences,Geology & Mineralogy
                ASTER,Viedma volcano,SiO2 wt%,Andean Austral Volcanic Zone,Chile,Volcán Viedma,Contenido SiO2,Zona Volcánica Andina Austral


                Comment on this article