Analyse de la structure d'un glacier rocheux du domaine tropical (Caquella, Sud Lipez, Bolivie)

The Caquelle rock glacier (5960 - 5400 m asl), by the size (one kilometer long) is probably the most important active rock glacier in the Inner Tropics. In this arid high mountain environment glaciers are lacking and rock glaciers represent, with the salt lakes, the best indicators of the climatic variability. This paper present the results of direct observations and geoelectrical soundings. The Caquella rock glacier results from a long evolution, which has probably its origin in the early Holocene. Presece of a very recent moraine in the upper part suggests presence of ELA on the rock glacier during the Little Ice Age. / Le glacier rocheux Caquella (5960 - 5400 m)d'un kilomètre de longueur est sans doute le glacier rocheux le plus actif de la zone intertopicale. Cet article présente des observations directes ainsi que le résultat de mesures de sondages électriques montrant de façon claire que ce glacier est en récession.