Abstract
The Chiriguelo carbonatitic complex crops out in northeastern Paraguay at the central western fringe of the stratoid volcanic rock-types of the Serra Geral Formation. At least three stages of emplacement of carbonatitic rocks can be distinguished: a C1 main søvite, a C2 alvikite and a C3 ferrocarbonatite. A C4 stage may be inferred from the diffusion of late quartz, barite, and uranpyrochlore. The geologic, petrographic, and geochemical traits show environmental conditions similar to volcanic ones, and point to a vertical zonation in the fenitization processes versus a K-enrichment near the surface. The CO isotopic data suggest a loss of isotopically light water, along with a loss of Sr, following the hydrothermal recrystallization process(es) of the main søvite. Such losses may be related to low-temperature ( e.g. down to 25°C) weathering processes.
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