Glaciares de Marte
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2006
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Asociación Española para la Enseñanza de las Ciencias de la Tierra
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Marte cuenta no sólo con dos espectaculares glaciares de casquete sobre sus polos, sino también con múltiples signos de flujo de hielo en sus latitudes medias. Muchos de estos flujos glaciares pueden estar relacionados con aparatos volcánicos, y producirse a partir de los volátiles emitidos en erupciones. En otros casos, el estudio de los depósitos glaciares marcianos permite plantear la posibilidad de vuelcos bruscos, de origen caótico, del eje de rotación. Según esta hipótesis, los periodos fríos afectarían alternativamente a las latitudes polares y a las ecuatoriales, una idea que, de confirmarse, llevaría a la conclusión de que las glaciaciones marcianas y terrestres se originan por mecanismos muy distintos. Aun así, la presente deglaciación rápida en ambos planetas permite plantear paralelos interesantes.
Mars has two small but outstanding polar glacier sheets, and also abundant traces of present and past mid-latitude glaciers. Many of these could be related to volcanic constructs through volatile species emitted in eruptions. The analysis of Martian moraines suggest also the possibility of chaotic overturns of the rotational axis. Insolation could then take minimum values alternately on high and low latitudes. If this hypothesis is confirmed, we would be lead to think that Martian and Earth glaciations originate through quite different mechanisms. Even then, the present rapid deglaciation on both planets permits an interesting parallel.
Mars has two small but outstanding polar glacier sheets, and also abundant traces of present and past mid-latitude glaciers. Many of these could be related to volcanic constructs through volatile species emitted in eruptions. The analysis of Martian moraines suggest also the possibility of chaotic overturns of the rotational axis. Insolation could then take minimum values alternately on high and low latitudes. If this hypothesis is confirmed, we would be lead to think that Martian and Earth glaciations originate through quite different mechanisms. Even then, the present rapid deglaciation on both planets permits an interesting parallel.