Máxima expansión del Glaciar Tenerife (51°S) durante el último milenio
Palavras-chave:
Glaciar Tenerife, morrenas, depósitos de till, Nothofagus pumilio, Placopsis cf. gelida (L) Linds.Resumo
En los Andes Patagónicos aún es materia de debate cuándo los glaciares alcanzaron su máxima expansión durante el último milenio. En este trabajo analizamos las fluctuaciones del Glaciar Tenerife (51°S), un pequeño glaciar de montaña ubicado inmediatamente al sur de los Campos de Hielos Patagónicos. Un análisis detallado de las geoformas glaciales del valle nos permitió identificar tres sistemas de morrenas, en la parte sur-central, suroccidental y septentrional del valle del Monte Tenerife, respectivamente. Mediante las edades obtenidas a través del conteo de anillos de árboles (Nothofagus pumilio) y medidas del diámetro de líquenes de Placopsis cf. gelida (L.) Linds, estimamos que el Glaciar Tenerife retrocedió de su máxima expansión de los últimos mil años inmediatamente después de 1742–1765 AD. La máxima expansión del Glaciar Tenerife durante el último milenio coincide con las máximas expansiones de los glaciares Schiaparelli (54°S) y Stoppani (55°S). Sin embargo, otros glaciares alcanzaron su límite máximo glacial más tempranamente y muestran una asincronía temporal en cuando ellos alcanzaron su extensión más grande. Esto sugiere una variabilidad temporal en la máxima expansión de los glaciares durante el último milenio en Patagonia sur (49° y 55°S).
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