Altered xenoliths in the 0.25-0.12 Myr non-welded ignimbrite deposits of the Island of Kos (Greece) provide evidence for a hydrothermal convective system in the basement complex. The conjunction of a potential heat source, high-temperature hydrothermal parageneses, permeable and porous bedded formations, continuing tectonic phenomena and successive fracturing and possible access by seawaters, argues for a favourable geothermal potential. The hydrothermal area of Volcania, where mineralized and sometimes degassing waters circulate, could be regarded as a zone of lateral leakage from the hydrothermal convective system, which developed above the cooling magma chamber. 32a-329. KOS (Crhx): mise en evidence d u n circuit hydrothermal de haute temperature, 12" RPunion des Sciences de la Terre, Lille, pp. 40. Fournier R.O. (1977) Chemical geothermometers and mixing models for geothermal systems, Geothermics, 5,41-50. Origin of rhyolites by anatectic melting of granitic crustal rocks. The example from the Island of Kos (Aegean Sea), Bull. Volc., 33, 948-959. Stadlbauer E., Bohla M. and Keller J. (1986) The Kos-Plateau-Tuff (Greece): a major ignimbrite eruption that crossed the open sea, Int. Symposium of Volcanology, abstract, New Zealand.

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