Síntesis de la evolución volcánica de Isla Decepción y la erupción de 1970
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Date
1971
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Abstract
Se describen los cambios morfológicos y el material piroclástico eyectado durante la erupción volcánica explosiva ocurrida en el área de Bahía Telefón, Isla Decepción, el 12 de agosto de 1970. Siete cráteres se abrieron sobre tierra, algunos de ellos cortando la cubierta de hielo, y al menos otros cuatro cráteres submarinos irrumpieron en el área de Isla Yelcho. Todos ellos son controlados por el sistema de fracturas del anillo interior de la caldera. La actividad eruptiva estuvo asociada a movimientos de alzamiento del bloque de Bahía Telefón, que determinó el desplazamiento de la linea de costa en aproximadamente 500 metros y la anexión de Isla Yelcho reduciendo a su mitad la Bahía Telefón. EI material piroclástico eyectado es andesítico; sus análisis químicos son similares a los de las erupciones de 1967 y 1969. Se da una breve síntesis de la evolución geológica de Isla Decepción y un registro de las erupciones históricas. Se analiza, ademas, la variación en el carácter químico de sus eruptivos a través del tiempo.
This report describes the morphologic changes and the pyroclastic material ejected during the explosive volcanic eruption that took place in Bahia Telefon, Deception Island, on August 12, 1970. Seven craters opened on land, some of them cutting through the ice cover, and at least four submarine vents exploded in the area of Yelcho Island. All the craters are controled by the interior ring fracture system of the caldera. The eruptive activity was associated with uplifting of Bahia Telefon, as a blocks with the consequent displacement of the shore line for about 500 meters and causing the annexion of Yelcho Island, thus reducing the surface of Bahia Telefon in nearly one half. The pyroclastic material ejected is andesitic; chemical annalyses are similar to those of the 1967 and 1969 eruptions. A brief synthesis of the geological evolution of Deception Island and its historical eruptions are given. The changes in the chemical character of the erupted material through time are annalysed.
This report describes the morphologic changes and the pyroclastic material ejected during the explosive volcanic eruption that took place in Bahia Telefon, Deception Island, on August 12, 1970. Seven craters opened on land, some of them cutting through the ice cover, and at least four submarine vents exploded in the area of Yelcho Island. All the craters are controled by the interior ring fracture system of the caldera. The eruptive activity was associated with uplifting of Bahia Telefon, as a blocks with the consequent displacement of the shore line for about 500 meters and causing the annexion of Yelcho Island, thus reducing the surface of Bahia Telefon in nearly one half. The pyroclastic material ejected is andesitic; chemical annalyses are similar to those of the 1967 and 1969 eruptions. A brief synthesis of the geological evolution of Deception Island and its historical eruptions are given. The changes in the chemical character of the erupted material through time are annalysed.
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Keywords
Geología, Volcanes, Erupciones volcánicas
Citation
Serie Científica, Vol. 2, nº 1, pp. 1-15, 1971