ISOTOPIC FEATURES OF THE GEOTHERMAL AQUIFER OF DECEPTION ISLAND, SOUTH SHETLAND ISLANDS, ANTARCTICA

PARICA, C. A.; REMESAL, M.; SALANI, F. M.

Otro; 22th Latinoamerican Colloquium; 2011

Deception Island is an active volcano in the Bransfield Strait sited in a marginal basin between the Antarctic Peninsula and the South Shetland Islands. Several ages had been proposed for its origin, based just on the stratigraphy 5 Ma, on palaeomagnetic studies by Valencio et al. (1979) the age is related to the Bruhnes cycle, which means 780.000 years. Keller et al. (1991)on K/Ar ages presented an age of 153.000 ± 46 years. Evolutive studies based on isotopes were developed by Parica et al. (1990), Ortíz Ramis, et al. (1987). For a better interpretation of the geothermal aquifer, several streams, fumaroles, sea water,snow and ice, and glassy rocks were sampled for different isotopic analyses, δ18O, δ2H and 87Sr/86Sr.