Resumo

PEREYRA, Fernando  e  ROVERANO, Daniel. Fossil rock glaciers and other criogenic forms in San Carlos de Bariloche, Río Negro. Rev. Asoc. Geol. Argent. [online]. 2010, vol.66, n.3, pp.430-437. ISSN 0004-4822.

Criogenic landforms are distinctive features in the Patagonic Andes. A fossil rock glacier, located in Cerro Catedral Zone is studied. Main features, genesis and palaeoclimatic implicances are considered. Studied zone is located in Cerro Catedral northern sector (41°10´S / 71°27´O), south west of San Carlos de Bariloche city close to Villa Catedral. Ocurrence of rock glaciers in the area resulted of the combination of several factors such as a colder and lightly drier weather than the present climate and a high coarse debris availability due to weathered and jointly outcropping rocks. Congelifraction is the main weathering process that supplied the debris. Landscape features, like height and geomorphologically instability due to rapid deglatiation, were also remarkable factors. Siltysize cineritic materials participation as slope cover was important, since they allow interstitial-ice and flowing of debris.

Palavras-chave : Rock glaciers; Patagonian Andes; San Carlos de Bariloche; Criogenic processes.

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