CONICET | Buscador de Institutos y Recursos Humanos

The aim of this work was to perform a baseline study about pedologic components of the geomorphic surfaces of different origins in a sector ofCerro Solo uranium ore deposit, situated in the arid central region of the Chubut province,Argentina. This contribution was requested by National Atomic Energy Commission of Argentina. The geomorphological units identified in the study area were:(1) Exhumed planation surfaces, composed of rounded hills of mesosiliceous-basicvolcanic rocks of Middle Jurassic age; (2) Pedisediments, consisting of four Early Pleistocene alluvial terrace levels; (3) Pediment association levels carved on the continental Cretaceous sediments; (4) Alluvial-fan relicts, with three geomorphic surfaces; (5) Modern alluvial-fans, composed of two coalescent alluvial fans, and (6) Alluvial plains and associated wetlands (mallines); these last ones are located in restricted areas where the water table is discharged at thalweg sectors of the chan-19 nels. The soil parent materials free carbonates (e.g., alluvial origin) their origin could be allochthonous, mainly by aeolian influx. These soils were classified as Calcids soil suborder, and their differences are due to the different development degree of calcretization and polygenesis. The soils developed on pediments have a varied morphology and soil types depending on the age of geomorphic surface and the degree of polygenesis, this last resulting from the alternation of morphogenesis periods with pedogenic periods. The soils more developed were classified as Natrargids and Haplargids, while that the oldest were truncated and were classified as Haplocalcids. The soils of the younger level were classified as Torriorthens. The soils formed on alluvial plains were classifies as Torrifluvents

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