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IPA Global Geocryologicl Database
Database Information Sheet
Unidad de Geocriologia
Instituto Argentino de Nivologia y Glaciologia
5500 - Mendoza
Permanent mailing address:
Enrique M. Buk
CC 330 - Mendoza - Argentina.
(054) (061) 274011-287029-285940
Morenas Coloradas and El Salto Basin Central Andes - Argentina.
32o 54' and 33o 01' S
69o 27' and 69o 15' W
El Salto Basin:
32o 55' and 32o 59' S
69o 21' and 69o 25' W
Inventory of rock glaciers:
Morenas Coloradas Basin: 1980, 1993.
El Salto Basin: 1981, 1986.
Primary rock glaciers are fed by avalanche chutes. At the rock glacier El Salto surveys have been undertaken in order to determine the creep rate. Between 1981 and 1986 temperatures at elevations between 3500 and 3600 m were measured in the active layer to a depth of 1 m with a multipoint temperature recorder (Grant). On the basis of these measurement Buk (1983) determined that permafrost table was at a depth of about 3 m and the base of the permafrost at 68 m. Similar conclusions were reached by Barsch and King (1989). As an ilustration of the importance of avalanches to these forms, the base camp there was destroyed by an avalanche in November 1983.
The surface of the basin of Morenas Coloradas is 54 km2, of which 10.4 km2 is seasonally frozen ground. The remaining 60% of the surface is typically periglacial with rock glaciers as the most important forms. In the glacigenic rock glacier, the clean glacier ice ends in detritus-covered or morainic tongues which result in glacigenic ice being incorporated within the substrate. In this way, ice persists at lower altitudes and under very arid conditions (Lliboutry, 1986; Garleff and Stingl, 1986; Schrott, 1992). Interconnected rock glaciers are generated which undergo different phases of activity not always in agreement with those expected as a result of their elevations. That is, they continue to show signs of activity not only at the height of the present 0 degree C air isotherm, but at lower elevations. In the last step downwards towards the valleys these rock glaciers become inactive, and finally morphologically relict or fossil rock glaciers are found. Meteorological, hydrological and geophysical measurements as well as 5 drillings to a depth of 5 m have been carried out in Morenas Coloradas. At an elevation of 3560 m the temperature oscillates around 0 degree C (with a maximum variation of 0.5 degree C) at depths between 4 and 5 m. The annual precipitation (1991-93) is 630 mm and the mean annual temperature is 1.6 degrees C. Using a calculated lapse rate of 0.52 degree C per 100 m, the 0 degree C isotherm occurs at approximately 3860 m, which represents a considerable rise in comparison with earlier years. It is assumed that this value is strongly influenced by climate warming in the 1980s and 1990s.
Temperatures measured at different depths in Morenas Coloradas at 3560 m are positively correlated with the discharge of Rio Vallecitos (correlation coefficients of 0.8-0.9; significance p=0.01). There is no correlation with snowfall data, however, because of the influence of the "zonda", a very dry and warm wind (up to 100 km/h) which impedes the accumulation of snow. Between 1978 and 1979, the zonda was active for more than 1000 hours. Discharge from the basin is of good quality and averages 505 l/s with a range from 230 l/s (early spring) to >1000 l/s (summer). In comparison, Schrott (1994) calculated the discharge of a rock glacier in the arid region of San Juan, Argentina to be only 5-8 l/s.
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Barsch, D and Happoldt, H. (1985). Blockgletscherbildung and holozene H÷henstufengliederung in den mendozinischen Anden, Argentinien. Zentralblatt fuer Geologie und Palaeontologie, 1 (11/12): 1625-1632.
Barsch, D and King, L. (1989). Origin and geoelectrical resistivity of rockglaciers in semiarid subtropical mountains, Andes of Mendoza, Argentina. Zeitschrift fuer Geomorfologie, N. F., 33 (2): 151-163.
Buk, E. (1983). Glaciares de escombros y su significacion hidrologica. Acta Geocriog‰nica, no. 1: 22-38, Mendoza.
Buk, E. (1987). Hydrochemestry of rivers in mountain permafrost at 33 degrees S, Mendoza, Argentina. V International Conference on Permafrost, Trondheim, Norway, 5p: 294-298.
Trombotto, D., Buk, E, & Hernandez, J. (1997). Monitoring of Mountain Permafrost in the Central Andes, Cordon del Plata, Mendoza, Argentina. Permafrost and Periglacial Processes, Vol.8: 123-129.
Trombotto, D. and Buk, E. 1998. Rock glaciers, Central Andes, Argentina. In: International Permafrost Association, Data and Information Working Group, comp. Circumpolar Active-Layer Permafrost System (CAPS), version 1.0. CD-ROM available from National Snow and Ice Data Center, email@example.com. Boulder, Colorado: NSIDC, University of Colorado at Boulder