Abstract

GONZALEZ DIAZ, Emilio F  and  DI TOMMASO, Inés. Paleogeoformas lacustres en los lagos Musters y Colhué huapí, su relación genética con un paleolago Sarmiento previo, centro-sur del Chubut. Rev. Asoc. Geol. Argent. [online]. 2014, vol.71, n.3, pp.416-426. ISSN 0004-4822.

The recognition of paleo lake accretion and erosional landforms on the east coast of lake Musters, as well as, on the east coast of the adjacent lake Colhué Huapí and far from lake environment, in the south of cerro Puricelli, at similar altimetric positions allowed genetically relate with a regional prior-body lake, named here paleo lake Sarmiento, which was generated by flooding of the preexisting depression of bajo de Sarmiento, after the capture of the Senguerr river. A maximum level for paleo-lake Sarmiento was estimated in 60 m above the current level of lake Musters. The accretional landforms show a sub-parallel arrangement and declining altimetry, this is a testimony of the progressive but intermittent paleo lake level fall. Paleo-littoral ridges were recognized on the eastern shores of lake Musters, in the west of bajo del Avestruz in a massive concentration and excellent state of preservation; in the Bahia Costa, northwest coast of this lake. On the eastern shores of lake Colhué Huapí and further away from the lakes area, on the south slope of cerro Puricelli. Paleo cliffs, also in higher positions, are relevant at the southern tip of the peninsula Baya. The full extension of the paleo lake Sarmiento was estimated in 4300 km². The concentration of paleo landforms on the eastern coast of both lakes are related to the wave dynamics, locally induced by dominant and intense paleo westerlies.

Keywords : Ephemeral lake; Littoral ridge; Extra-Andean Patagonia; Holocene.

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