Publication: Dinámica y evolución glaciar en la garganta de Bohoyo (Sierra de Gredos, Sistema Central Iberico)
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2009
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Associação Portuguesa de Geomorfólogos
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Abstract
La garganta de Bohoyo (Sierra de Gredos-Sistema Central Ibérico) contiene en su zona de cabecera un glaciar de montera anterior a los glaciares de valle que aparecen en esta y otras gargantas de la región. Till de ablación, crestas, arcos morrénicos y otras formas erosivas, permiten distinguir dos episodios de estabilización en dicha montera glaciar. El primero representa un máximo absoluto y está representada por un till de ablación tan desconectado del relieve torrencial circundante que debe pertenecer a un ciclo glaciar independiente. El segundo episodio queda definido por pequeños arcos y complejos morrénicos. La cartografía de estos depósitos indica una difluencia, con el hielo pasando de la vertiente Norte de la sierra a la Sur, y una progresiva disminución de la masa de hielo, marcada por hasta cuatro crestas morrénicas. Los siguientes episodios, conocidos ya y muy documentados, se caracterizan por la presencia de glaciares individualizados de valle, cuyas huellas abundan en el sector medio y bajo de la garganta, que fueron desapareciendo conforme las condiciones climáticas se hicieron más cálidas.
The gorge of Bohoyo (Sierra de Gredos-Central Iberian Range) contains in its upper part the remains of an ice cap older than the glaciers that occupied this valley and other gorges in the region. Till ablation, ridges, moraines and other erosive forms allow to distinguish two episodes of stabilization in the ice cap. The first stage, an absolute maximum, les an ablation till, so disconnected from the surrounding torrential landforms that it must belong to an independent glacial cycle. The second episode evidence is a collection of moraines. The mapping of these deposits indicates a diffluent flow, with ice crossing the present watershed, from the north to the south, and a gradual decrease in ice mass, marked by up to four ridges moraine. In the following episodes, already known and well documented in previous works, valley glaciers occupied the valleys and gorges and were to disappear under warmer climatic conditions.
The gorge of Bohoyo (Sierra de Gredos-Central Iberian Range) contains in its upper part the remains of an ice cap older than the glaciers that occupied this valley and other gorges in the region. Till ablation, ridges, moraines and other erosive forms allow to distinguish two episodes of stabilization in the ice cap. The first stage, an absolute maximum, les an ablation till, so disconnected from the surrounding torrential landforms that it must belong to an independent glacial cycle. The second episode evidence is a collection of moraines. The mapping of these deposits indicates a diffluent flow, with ice crossing the present watershed, from the north to the south, and a gradual decrease in ice mass, marked by up to four ridges moraine. In the following episodes, already known and well documented in previous works, valley glaciers occupied the valleys and gorges and were to disappear under warmer climatic conditions.