Aconcagua Climbing – Expedition or climbing alone?

Some small sinkholes in the distal part of the deposit and very few depressions with lagoons, which indicates the presence of an impermeable substrate. The mounds are rounded and smooth on the surface and soils have developed in the depressions. In a profile product of a road cut, a soil has been observed in these depressions, covered by detrital material from the mounds that surround the hollow, as converging microslopes. This remobilization of material from the top of the mounds into the surrounding depressions has considerably smoothed the original surface of the deposit. In addition to gravity, periglacial processes, Aconcagua Argentina surface weathering and wind deposition have contributed to it. Towards the distal zone, at the Confluence with the Cuevas valley, the deposit is divided into two lobes; one penetrates perpendicularly to the valley of the Cuevas river, in the same direction that it brought in the Horcones, while the second lobe extends downstream in the valley of the Cuevas river, advancing approximately 2,000 m in it. The cross-sectional profile of the Horcones deposit indicates that it is higher in the center than towards the flanks. The distal edge of the Horcones deposit is therefore located at the Confluence of the Horcones and Cuevas river valleys. This distal edge of the Horcones deposit is perfectly defined and has a variable height between 5 and 10 meters, which allows the deposit in question to be separated from the surrounding land. The latter correspond to a lithologically similar deposit located just below, and Mount Aconcagua also has an irregular morphology, although smoother than that of the Horcones deposit. In accordance with what was mentioned above, the study of the filling material of the valleys of the area made it possible to distinguish essentially two types of deposits, also well distinguishable by their field (megascopic) and morphological characteristics, previously considered as till by other authors.

Numerous mineralogical, granulometric and roundness analyzes were carried out on the matrix of both deposits present in the different valleys, in order to capture the complete lithological characterization of Aconcagua and precisely define their genesis. Sampling was carried out in the Horcones Inferior, Horcones Superior and Horcones valleys (both proximal and distal, already at the intersection with the Cuevas River). The underlying deposit exposed by the deepening of the Cuevas River, only had a microscopic study of the loose grain of the sandy-silty material in order to determine its mineralogical composition. A synthesis of the lithological characteristics of the Quebrada de Horcones deposit was presented by Lagorio et al.