Isotopic features of the geothermal aquifer of Deception Island, South Shetland Islands, Antarctica

PARICA CLAUDIO ALBERTO; REMESAL, M.B.; SALANI, F.M.

Heidelberg

Congreso; 22nd International Collquium on Latein Amerikan Earth Sciences; 2011

Ruprecht-Karls-Universität Heidelberg

The interaction in the volcanic system is clear, access of sea water to the geothermal aquifer, also fresh water in lesser proportions. Everything has the isotopic signature to understand the interaction. The glassy rocks, also are representative of the presence of sea water in the geothermal aquifer, when the glass is dry has 87Sr/86Sr typical for these rocks and origin (0.7031 and 0.7032), but in hydrated glasses the 87Sr/86Sr ratios the sea water signature were recognized (0.7093). Some others chemistry (Cl-) and isotopic analysis by Dapeña et al. (2005) were also useful to understand the dynamic of this volcano.