Impact of natural parameters on rock glacier development and conservation in subtropical mountain ranges. Northern sector of the Argentine Central Andes

FORTE, ANA P.; VILLARROEL, CRISTIAN D.; ESPER ANGILLIERI, MARÍA Y.

The Cryosphere Discussions

Copernicus Publications

Año: 2016 p. 1 - 24

This paper presents a detailed rock glacier inventory used in determining how the various natural parametersaffect a mountain periglacial environment. This study was undertaken in a northernmost sector of the central ArgentineAndes, in an area stretching between 31°02´ and 31°22´ S latitude. This is a high and arid subtropical region wherepermafrost and cryogenic processes are predominant, featuring as well as a large number of rock glaciers and associatedperiglacial landforms. Rock glaciers inventory was based on geomorphological characterization with optical remote sensingdata and field description information. The study region covers 630 km2 15 , with 3,25 % of this area showing 402 rock glaciersand protalus rampart features. In total, 172 rock glaciers have been identified, 48 of which are considered active. In such asector, the protalus rampart range shows the largest landform occurrences, though fossil and inactive rock glaciers areusually larger and are developed over a larger attitudinal distribution. Based on previous studies, we have considered that thestudy of active rock glaciers is an effective approach to assess the current state of periglacial environment evolution. 20 Therefore, we analysed their spatial distribution and their relationship through different variables, by resorting to statisticalanalysis and a frequency ratio method. The chosen natural parameters were: Lithology, Elevation, Latitude and Longitude, Aspect, Slope and Annual Potential Solar Incoming Radiation. Analytical results have demonstrated that active rock glacierslandforms lie above 3.600 m.a.s.l. elevations, on 11° to 28° slopes with predominating south facing aspect and relatively lowsolar radiation. The statistical analysis shows that elevation, lithology and aspect are the most influencing factors for current25 periglacial environment development while rock glacier conservation is mainly controlled by lithology. On the study area, the annual potential solar radiation show high values but there is not any significant difference between landform and, therefore, it is scarcely influential. The research is carried out over a high mountain area where poor accessibility hinderedthe chances for obtaining systematic data on weather and environment. A simple and low coast methodology was used toanalyse an area where no studies on rock glacier distribution had been made before. This information gains special30 importance because Argentina has recently instituted a national law for glacial and periglacial environment protection and conservation. Therefore, this research and its results may contribute a significant step toward knowing the number, featuresand distribution of rock glacier bodies lying in a scarcely studied region.