Reconocimiento del cuaternario entre Punta Arenas y Río Chabunco, estrecho de Magallanes, Chile
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Fecha
1988
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En el sector comprendido entre río Chabunco y Punta Arenas se exponen algunas morreras laterales y de fondo, depositadas durante la última glaciación que ocupó el valle del Estrecho de Magallanes. Posteriormente, durante el retroceso del glaciar se produjo una significativa erosión y depositación en ambiente fluvial, la que fue determinante de la geomorfología actual. Las unidades geomorfológicas más destacadas en el área corresponden a Terrazas Fluviales, Terrazas Kames y una Kame de gran expresión, la que con anterioridad ha sido interpretada como Morrena latero-frontal, por otros autores. Al continuar el retroceso del hielo se generó una intensa erosión fluvial en las zonas bajas de las laderas del valle. La ingresión marina es tardía en el Estrecho de Magallanes y afectó los depósitos ubicados aproximada mente bajo los 4 m.s.n.m.
Some lateral and bottom moraines deposited during the last glaciation occupying the Strait of Magallanes valley are exposed between the Chabunco river and the city of Punta Arenas. Posteriourly, during the glacial recession, a significative erosion and depositation process in a fluvial environment, which was determinative for the present geomorphology, ocurred. The most noticeable geomorphological units of the area correspond to Fluvial Terraces, Kame Terraces and a Kame oflarge expression, which was previously interpreted as a latero-frontal moraine, for another authors. As the glacial recession continued, an intensive fluvial erosion process developed at the lower levels of the Strait of Magallanes valley. Marine ingression in the Strait valley ocurred lately and affected the deposits located at approximately 4 m over the present sea level.
Some lateral and bottom moraines deposited during the last glaciation occupying the Strait of Magallanes valley are exposed between the Chabunco river and the city of Punta Arenas. Posteriourly, during the glacial recession, a significative erosion and depositation process in a fluvial environment, which was determinative for the present geomorphology, ocurred. The most noticeable geomorphological units of the area correspond to Fluvial Terraces, Kame Terraces and a Kame oflarge expression, which was previously interpreted as a latero-frontal moraine, for another authors. As the glacial recession continued, an intensive fluvial erosion process developed at the lower levels of the Strait of Magallanes valley. Marine ingression in the Strait valley ocurred lately and affected the deposits located at approximately 4 m over the present sea level.
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Cuaternario, Última glaciación, Kame, Erosión fluvial
Citación
Anales del Instituto de la Patagonia, Vol. 18, pp. 43-49, 1988.