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Paleosuelo
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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Paleosuelo

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

Paleosuelo.

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

Coordenadas : 248527 - 5708258 - Altitud: 783.

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

Dimensión: Sitio.

Valor Intrínseco: Cientifico - Interés Geologo:   Volcánico - Estratigrafico.

Accesibilidad: Muy fácil , Se encuentra a orillas del camino, puede ser destruido.

 

Características principales
Este geositio es uno de los pocos lugares donde se puede apreciar de cerca el contacto entre un paleosuelo y una colada de lava.

En este geositio se puede ver el contacto entre lavas de la unidad Llaima fisural 2 y una capa de paleosuelo. Al lugar se puede

acceder con camioneta.

Afloramiento donde se puede encontrar Paleosuelo

Descripción
En este geositio se puede ver el contacto entre lavas de la unidad Llaima fisural 2 y una capa de paleosuelo.

El termino paleosuelo se aplica a un suelo que se ha formado en un paisaje del pasado o que se ha formado bajo condiciones ambientales

distintas. Los paleosuelos indican periodos de estabilidad geomorfológica, de no depositación ni erosión, al menos de una manera significativa.

En este lugar se puede ver el paleosuelo sobreyaciendo a la Ignimbrita Curacautín, Pleistoceno medio, que consiste en depósitos de flujo piroclástico, tipo escoria y ceniza, que se encuentran distribuidos sobre los valles radialmente dispuestos alrededor del volcán Llaima. Y a su vez, es sobreyacida por una colada de lava de la unidad Llaima fisural 2, representada por los productos volcánicos emitidos por conos piroclásticos adventicios, bien conservados, ubicados a lo largo de estructuras paralelas de orientación ENE a E-W de 2 a 2,5 km de largo. Los conos ubicados en el flanco nororiental del volcán fueron los que generaron la colada de lava que se puede observar en el lugar. Las lavas de esta unidad tienen una composición
andesítica basáltica (55,3% SiO2) y son de tipo ‘aa’.

El paleosuelo que aquí se observa corresponde a un ‘suelo enterrado’, los cuales presentan el inconveniente de que los procesos diagenéticos que lo afectan, pueden transformar o afectar significativamente sus características, originando dificultades en las interpretaciones paleoambientales. Aun así, se ha podido datar un trozo de madera carbonizada encontrada en el lugar, producto de la depositación de la colada de lava sobre este suelo, y mediante una determinación radiométrica C14 se pudo obtener una edad de 2.940±60 AP, que es una edad máxima para la unidad Llaima fisural 2.
Bibliografía
- Naranjo, J.A.; y Moreno, H. 2005. Geología del volcán Llaima, Región de la Araucanía. Servicio Nacional de Geología y Minería, Carta Geológica de Chile, Serie Geología Básica, No. 88, 33p., 1 mapa escala 1:50.000, Santiago
- http://www.ceicin.org.ar/IMG/pdf/Paleosuelos.pdf

 

 

 

 

 

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