Other
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997gecoa..61.3425c&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 61, Issue 16, p. 3425-3440.
Other
20
Scientific paper
Between 1987 and 1995, gases were sampled from various manifestations on Vulcano Island including various fumaroles at La Fossa crater and Baia di Levante and diffuse soil gas emissions in several areas which are characterized by high C02 fluxes. Since the end of 1987, volcanic activity has increased considerably, showing a marked rise in temperature (300°C in 1987 to 670°C in December, 1992) and in output of steam from crater fumaroles. In addition, variations have been observed in the chemical and isotopic compositions of gases and thermal waters, which can be attributed to an increased inflow of deeper fluids. The isotopic composition of fumarolec steam seems to be the result of mixing processes between a positive endmember of deep origin (δD = +10‰ ˜ +15‰ δ18O= +6‰ ˜ +8‰) and two endmembers of meteoric origin with different oxygen-shifts. Variations observed in the C02 isotopic composition suggest that all sampled manifestations are fed by a single deep source which may be magmatic. Such a source would be characterized by the 613CCO2 values of high-temperature fumaroles (δ13CCO2 ≅0‰) these values are noticeably more positive than those generally attributed to magmatic gases (δ13CCO2 = -5‰ ˜ -8‰) implying crustal contamination processes of the magma. The observed decrease in δ18OCO2 values of the crater fumaroles (from +20‰ in 1978 to between +12‰ and +15‰ in 1993 1994) was probably caused by two different processes. The first is a reduction of the enrichment factor between C02 and H2O which is related to the increased temperature of the gases, and the second is a mixing with more negative waters of meteoric origin. Finally, C02 addition or removal processes caused by interactions between deep gases and shallow hydrothermal waters are likely to be responsible for the different chemical and isotopic compositions of gaseous emissions in the Vulcano Porto area and the crater fumaroles.
Capasso Giorgio
Favara Rocco
Inguaggiato Salvatore
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