Abstract

GONZALEZ DIAZ, Emilio F  and  DI TOMMASO, Inés. Big slides in Neuquén tributary ravines of Barrancas middle river, north of Neuquén Province. Rev. Asoc. Geol. Argent. [online]. 2012, vol.69, n.3, pp.466-474. ISSN 0004-4822.

Various phenomena of mass-wasting process so far unknown are described and discussed, located in the north-end of Neuquén province, drained by tributaries of the local river Barrancas basin. Two great movements were found in the ravines of La Lagunita and de los Díaz, which are defined by their volumes as rock avalanches. Complex landslides (slumps + distal earth flows), were identified in the east vicinity of the rock avalanche of La Lagunita and in the Buta Cura and Los Nevados valleys. A large rotational slip was found in the far east of the watershed, between the La Lagunita and de los Díaz valleys. Many smaller-scale landslides are distributed at the foot of the slopes of the main tributary valleys. At present, the process of mass-wasting is evidenced by small debris flows and earth flows. The promotion of landslides is varied. The occurrence of rock avalanches is related with earthquakes, while that of complex landslides and smaller-scale landslides are linked to excessive rainfall. Rock avalanches are awarded to post-glacial times or at the end of the Pleistocene, coinciding with the local withdrawal of the glaciers. The development and hosting of their accumulations have been taken place in previous glacial valleys. The events of other phenomena, are awarded to an undetermined Holocene.

Keywords : Mass-wasting; Rock avalanches; Complex landslides; Flows; North of Neuquén Province.

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