Abstract
Submarine caves at the Cape of Otranto in South-Eastern Italy host eccentric stalactites which have been recently recognised as completely biogenic. The possibility to use the calcareous tubules of Polichaete forming the inner texture of the stalactites as suitable samples for radiocarbon dating is described. AMS radiocarbon dating analyses performed on samples taken at different positions along the longitudinal axis of three different stalactites allowed to obtain information about the duration of the formation phase, to determine the growth-rate at different stages of evolution and to establish the complete submarine origin of the stalactites. The comparison of the radiocarbon data obtained for the different studied structures reveal also similarities as well as important differences between single stalactites, supplying new information about their response to environmental changes in the same, confined ecosystem.
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