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CO2 Degassing over Seismic Areas: The Role of Mechanochemical Production at the Study Case of Central Apennines

  • F. Italiano
  • G. Martinelli
  • P. Plescia
Chapter
Part of the Pageoph Topical Volumes book series (PTV)

Abstract

Field observations coupled with experimental results show that CO2 can be produced by mechanical energy applied to carbonate rocks becoming an unexpected additional gas source besides that degassed from the mantle or produced by thermometamorphism. The evidence that a large amount of carbon dioxide associated with radiogenic-type helium (R/Ra as low as 0.01–0.08) is released through continental areas, denotes the absence of a contribution from the mantle or from mantle-derived fluids. Data collected during the seismic crisis which struck the Central Apennines in 1997–98 have shown an enhanced CO2 flux not associated with the presence of mantle or thermometamorphic-derived fluids. On the other hand, new experimental results highlight the possibility of producing CO2 by mechanical energy that acts on the calcite crystalline lattice. While the CO2 released over the geothermal areas (e.g., Larderello Geothermal Field) is obviously derived by mantlederived activities, this is not the case of the huge amount of CO2 released over the seismically active areas where the presence mantle-derived products is ruled out. We propose that mechanical energy, e.g., released during seismic events, microseismicity or creeping processes is a possible additional energy source able to produce CO2 and thus could explain the presence of CO2 degassing over tectonic areas where the influence of the mantle is low.

Keywords

Geothermal Area Seismic Area Helium Isotope Umbria Region Apennine Chain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Birkhäuser Verlag, Basel 2008

Authors and Affiliations

  • F. Italiano
    • 1
  • G. Martinelli
    • 2
  • P. Plescia
    • 3
  1. 1.INGV Istituto Nazionale Geofisica e VulcanologiaSezione di PalermoItaly
  2. 2.ARPA Environmental Protection Agency of Emilia RomagnaReggio EmiliaItaly
  3. 3.CNR Istituto Studio Materiali NanostrutturatiMontelibretti RMItaly

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