Compositional variations revealed by ASTER image analysis of the Viedma Volcano, southern Andes Volcanic Zone.
Variaciones composicionales reveladas mediante analisis de imagenes ASTER del volcan Viedma, Zona Volcanica Andina Austral.
| dc.contributor | en-US | |
| dc.contributor | es-ES | |
| dc.creator | Kobayashi, Chiaki | |
| dc.creator | Orihashi, Yuji | |
| dc.creator | Hiarata, Daiji | |
| dc.creator | Naranjo, Jose | |
| dc.creator | Kobayashi, Makoto | |
| dc.creator | Anma, Ryo | |
| dc.date | 2010-08-17 | |
| dc.identifier | http://www.andeangeology.cl/index.php/revista1/article/view/V37n2-a09 | |
| dc.identifier | 10.5027/andgeoV37n2-a09 | |
| dc.description | 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 calculated 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 AVZ 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. | en-US |
| dc.description | Mediante el uso de tecnica de sensoria remota se ha desarrollado un mapeo litologico del volcan Viedma, uno de los cinco volcanes de la Zona Volcanica Andina Austral (ZVA). Para este efecto, se ha utilizado el radiometro ‘Advanced Spaceborne Thermal Emission and Reflection’ (ASTER) que es muy efectivo en investigacion geologica, para entender los procesos que han controlado la estructura y deducir las variaciones composicionales del volcan Viedma, que sobresale levemente de la superficie del campo de hielo Patagonico Sur. Sobre la base de la observacion en el intervalo del espectro visible e infrarrojo cercano, en el edificio se distinguen partes brillantes que corresponden al flanco oriental del volcan y partes oscuras en el area del crater central. La concentracion de SiO2 se calculo a traves 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 volcan Viedma expone una amplia diferenciacion de las concentraciones de SiO2. Aunque, segun otros autores, las muestras analizadas de material piroclastico del volcan Viedma tienen contenidos de 64-66% SiO2 y que otros aparatos de la ZVA son volcanes esencialmente monolitologicos daciticos/andesiticos, el edificio del volcan Viedma estaria compuesto principalmente de basaltos o las rocas mas antiguas de su basamento tienen un bajo contenido de silice. | es-ES |
| dc.format | application/pdf | |
| dc.format | text/html | |
| dc.language | eng | |
| dc.publisher | Servicio Nacional de Geología y Minería | en-US |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/view/V37n2-a09/1018 | |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/view/V37n2-a09/html | |
| dc.source | Andean Geology; Vol 37, No 2 (2010); 433-441 | es-ES |
| dc.source | Andean Geology; Vol 37, No 2 (2010); 433-441 | en-US |
| dc.source | 0718-7106 | |
| dc.source | 0718-7092 | |
| dc.title | Compositional variations revealed by ASTER image analysis of the Viedma Volcano, southern Andes Volcanic Zone. | en-US |
| dc.title | Variaciones composicionales reveladas mediante analisis de imagenes ASTER del volcan Viedma, Zona Volcanica Andina Austral. | es-ES |
| dc.type | info:eu-repo/semantics/article | |
| dc.type | info:eu-repo/semantics/publishedVersion | |
| dc.type | es-ES | |
| dc.type | en-US |
This item appears in the following Collection(s)
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Andean Geology
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