Molecular and isotopic composition of free hydrocarbon gases from Sicily, Italy

Mariano Valenza, Eckhard Faber, Giorgio Capasso, Fausto Grassa, Salvatore Inguaggiato, Rocco Favara

Risultato della ricerca: Article

16 Citazioni (Scopus)

Abstract

Chemical and isotopic data have been used as geochemical tracers for a genetic characterization of hydrocarbon gases from a total of eleven manifestations located in Eastern and Central-Southern Sicily (Italy). The molecular analysis shows that almost all the samples are enriched in methane (up to 93.2% Vol.), with the exception of four gas samples collected around Mt. Etna showing high mantle-derived CO2 content. Methane isotope signatures suggest that these are thermogenic gases or a mixture between thermogenic gases and microbial gases. Although samples from some mud volcanoes in Southern Sicily (Macalube di Aragona) show isotope signatures consistent with a mixing model between thermogenic and microbial, by combining the molecular compositions (C-1/(C-2 + C-3)) and the methane isotope ratios (delta(13)C(1)), such a process seems to be excluded. Therefore, the occurrence of secondary post-genetic processes should be invoked. Two main hypotheses have been considered: the first hypothesis includes that the gas is produced by microbial activity and altered post-genetically by microbial oxidation of methane, while according to the second hypothesis thermogenic gas have modified their molecular ratios due to vertical migration.
Lingua originaleEnglish
pagine (da-a)1-4
Numero di pagine4
RivistaGeophysical Research Letters
Volume31
Stato di pubblicazionePublished - 2004

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Sicily
Italy
isotopic composition
hydrocarbons
hydrocarbon
gases
gas
methane
isotope
isotopes
signatures
mud volcano
mud
molecular analysis
isotope ratios
vertical migration
volcanoes
microbial activity
tracers
Earth mantle

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cita questo

Valenza, M., Faber, E., Capasso, G., Grassa, F., Inguaggiato, S., & Favara, R. (2004). Molecular and isotopic composition of free hydrocarbon gases from Sicily, Italy. Geophysical Research Letters, 31, 1-4.

Molecular and isotopic composition of free hydrocarbon gases from Sicily, Italy. / Valenza, Mariano; Faber, Eckhard; Capasso, Giorgio; Grassa, Fausto; Inguaggiato, Salvatore; Favara, Rocco.

In: Geophysical Research Letters, Vol. 31, 2004, pag. 1-4.

Risultato della ricerca: Article

Valenza, M, Faber, E, Capasso, G, Grassa, F, Inguaggiato, S & Favara, R 2004, 'Molecular and isotopic composition of free hydrocarbon gases from Sicily, Italy', Geophysical Research Letters, vol. 31, pagg. 1-4.
Valenza, Mariano ; Faber, Eckhard ; Capasso, Giorgio ; Grassa, Fausto ; Inguaggiato, Salvatore ; Favara, Rocco. / Molecular and isotopic composition of free hydrocarbon gases from Sicily, Italy. In: Geophysical Research Letters. 2004 ; Vol. 31. pagg. 1-4.
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AU - Favara, Rocco

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