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Glaciares y Glaciaciones - Formación del Hielo Glaciar
Glaciares y Glaciaciones - www.rutageologica.cl - info@rutageologica.cl

Los Glaciares: una parte de dos ciclos basicos. - Tipos de Glaciares: Glaciares de Valle (Alpinos) - Glaciares de Casquete - Otros tipos de Glaciares. Formacion del Hielo Glaciar - Movimiento de un Glaciar: Velocidad de Movimiento de un Glaciar - Balance de Un Glaciar. Erosion Glaciar. Formaciones Geologicas x Glaciar: Valles Glaciares - Aristas y Horns - Rocas Aborregadas.

Glaciares y Glaciaciones - www.rutageologica.cl - info@rutageologica.cl

Depositos Glaciares. Formas Constituidas por Tills: Morrenas Laterales y Centrales - Morrenas terminales y laterales - Drumlins. Formas Constituidas por Derrubios Glaciares: Llanuras Aluviales y Valley Trains - Depositos en contacto con el Hielo. Teoria Glaciar y El Periodo Glaciar Cuaternario.- Causas de Las Glaciaciones: Tectonica de placas - Variaciones en la Orbita de la Tierra.

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RUTAS GEOLOGICAS ARAUCANIA


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GEOLOGIA GENERAL


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GLACIARES Y GLACIACIONES


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Glaciares y Glaciaciones - Formación del Hielo Glaciar

GEOLOGIA GENERAL - Glaciares

Extracto : "Ciencias de la Tierra 8 EdicionUna Introducción a la Geología FísicaEdward J. Tarbuck, Frederick K. Lutgens".

Formación del Hielo Glaciar

I,a nieve es la materia prima a partir de la cual se origina el hielo glaciar; por consiguiente, los glaciares se forman en áreas donde cae más nieve en invierno de la que se derrite durante el verano. Antes de que se cree un glaciar la nieve debe convertirse en hielo glaciar. Esta transformación se muestra Ia Figura 18.5.

Cuando las temperaturas permanecen por debajo del punto de congelación después de una nevada, la acumulación esponjosa de los delicados cristales hexagonales pronto empieza a cambiar. A medida que el aire se infiltra por los espacios que quedan entre los cristales, los extremos de los cristales se evaporan y el vapor de agua se condensa cerca de su centro. De esta manera los copos de nieve se hacen más pequeños, más gruesos y más esféricos, y desaparecen los espacios porosos grandes. Median-

te este proceso el aire es expulsado y, lo que en una ocasión fue nieve esponjosa y ligera, recristaliza en una masa mucho más densa de pequeños granos que tienen la consistencia cle una aren¡ gruesa. Esta nieve recristalizada granular se denomina neviza 1. sueles encontrarse corno componente de antiguos bancos de nieve cerca del final del invierno. A medida que se añade más nieve, aumenta la presión en las capas inferiores, compactando con ello los granos de hielo situados en profundidad. Cuando el es-

pesor del hielo y de la nieve supera los 50 metros, el peso es suficiente para fusionar la neviza en una masa sólida de cristales de hielo trabados. Se acaba de formar el hielo glaciar.

 



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