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Erosión Glaciar en Lava del Volcán Sollipulli
Geoparques de Chile - www.rutageologica.cl - info@rutageologica.cl

El Geoparque proyectado se ubica entre los 38º y 39º S, en la zona cordillerana de la Región de Araucanía, abarcando un área aproximada de 4.300 km2 e incluye parte de las comunas de Melipeuco, Curacautín, Vilcún y Lonquimay. Uno de los principales atractivos de este geoparque es el Parque Nacional Conguillío, que hospeda al volcán Llaima, uno de los más activos de Sudamérica.

Parque Nacional Villarrica - www.rutageologica.cl - info@rutageologica.cl

Parque Nacional Villarrica, El imponente volcán Villarrica es el que le da el nombre a este parque compartido por las regiones de la Araucanía y de Los Ríos. Su topografía se caracteriza por las altas cumbres, los terrenos divididos por quebradas y los diversos cursos de agua,

Cuevas Volcanicas www.cuevasvolcanicas.cl - info@cuevasvolcanicas.cl

Cuevas Volcánicas - Camino al Volcán Villarrica Km. 14,5 Pucón - Chile. Tours Cuevas - Canopy - Trekking - Excursión motos de Nives -

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RUTAS GEOLOGICAS ARAUCANIA


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GEOLOGIA GENERAL


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PARQUES NACIONALES


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GEOPARQUES


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Erosión Glaciar en Lava del Volcán Sollipulli

("Extracto Memoria de Titulo: Identificación, Caracterización y Cuantificación de Geositios, para la creación del I Geoparque en Chile, en Torno al Parque Nacional Conguillio" Geológo Paola Macarena Mártinez Escobar, Universidad de Chile")

Erosión Glaciar en Lava del Volcán Sollipulli.

Ubicación : Región de la Araucania , Provincia : Cautín,  Comuna: Melipeuco.

Coordenadas : 273102 - 5690078 - Altitud:

Población más próxima:  Melipeuco, 13,5 Km Aprox.

Dimensión: Sitio.

Valor Intrínseco: Cientifico - Interés Geologico:  Petrológico - Volcánico - Fluvial - Glaciar.

Accesibilidad: Muy Facil , Camino de tierra en buen estado.

 

Características principales
Afloramiento de lava del volcán Sollipulli, que presenta marcas da erosión glaciar. Este geositio se encuentra en el camino que se interna desde Melipeuco al valle Alpehue y se encuentra situado en la confluencia de los ríos Alpehue y Queipue

Lava del volcán Sollipulli y esquemas de abrasión glaciar

Descripción
El volcán Sollipulli Corresponde es una estructura compuesta por una caldera de colapso más antigua, profundamente erosionada por glaciares (<0,5 Ma) y un segundo volcán-caldera, con alturas entre 2.000 y 2.240 m s.n.m., anidado en el extremo noreste de la anterior. No hay mucha información detallada sobre las lavas emitidas por este volcán a lo largo de su historia, pero al parecer, la lava presente en este geositio correspondería a la unidad 1 del volcán (Pleistoceno superior) constituida por lavas, brechas e ignimbritas, de composición basáltica a dacítica.

Lo interesante de este geositio es que la roca presenta evidencias de erosión glacial. Los glaciares erosionan el terreno fundamentalmente de dos maneras: arranque y abrasión. El primer proceso ocurre a medida que un glaciar fluye sobre una superficie fracturada del lecho de roca, ablandando y levantado bloques de roca que incorpora al hielo. De esta manera sedimentos de todos los tamaños entran a formar parte de la carga del glaciar. Los glaciares son capaces de transportar bloques tan grandes que ningún otro agente erosivo podría mover. El segundo proceso es la abrasión. A medida que el hielo y los sedimentos que arrastra se deslizan sobre las rocas, estos actúan como papel lija, alisando y puliendo la superficie.

Cuando el hielo del fondo de un glaciar contiene grandes fragmentos de roca, pueden excavarse arañazos y surcos denominados ‘estrías’. Estos surcos proporcionan pistas sobre la dirección del flujo del hielo. También es posible encontrar marcas de impacto que se generan cuando grandes bloques golpean la roca.
En este caso las estrías encontradas en la lava tienen una dirección paralela a la del valle Alpehue y no son muy profundas.

Bibliografía
- Naranjo, J.A., Moreno, H., Emparan, C., Murphy, M. 1993. Volcanismo explosivo reciente en la caldera del volcán Sollipulli,
Andes del Sur (39°S). Revista Geológica de Chile. Vol. 20, No. 2, p. 167-191.
- Suárez, M.; Emparan, C. 1997. Hoja Curacautín, Regiones de la Araucanía y del Biobío. Servicio Nacional de Geología y
Minería. Carta Geológica de Chile, No. 71, 105 p., 1 mapa 1:250.000 (realizado por C. Emparan, M. Suárez y J. Muñoz, 1992)
- Tarbuck, E.J.; Lutgens, F.K., y Tasa, D. 2005. Ciencias de la Tierra. Pearson Educación S.A., p. 736, Madrid.

 

 

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