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Natural sources of carbon dioxide and methane from the fluvio-lacustrine sediments of the Fucino Plain (central Italy); evidence from stable carbon isotopes

Francesca Giustini and Mauro Brilli
Natural sources of carbon dioxide and methane from the fluvio-lacustrine sediments of the Fucino Plain (central Italy); evidence from stable carbon isotopes
Italian Journal of Geosciences (October 2014) 133 (3): 439-444

Abstract

The present investigation focused on the origin of CO (sub 2) and CH (sub 4) in the soil gas and two gas vents present in the Fucino plain, a tectonically active intramontane depression of central Italy. The soil gases have concentrations of CO (sub 2) ranging from 1 to 10% and CH (sub 4) in the order of a few parts per million. Using carbon isotopes, it was possible to identify two different sources of CO (sub 2) in the soil gas: biogenic CO2 (delta (super 13) CCO (sub 2) approximately -20 ppm) produced in the fluvio-lacustrine sediments of the plain and CO (sub 2) produced from CH (sub 4) oxidation in soil (delta (super 13) CCO (sub 2) -34/-38 ppm). The two gas vents yield CO (sub 2) contents of 2.63 and 15.33% and CH (sub 4) of 94.7 and 8.5%. In the CH (sub 4) -dominated gas vent, the carbon isotopes of methane (delta (super 13) CCH (sub 4) =-64 ppm) point to a gas of microbial origin. The other gas vent, with a delta (super 13) CCH (sub 4) of -52.8 ppm, may be affected by a microbial oxidation process.


ISSN: 2038-1719
EISSN: 2038-1727
Coden: BOGIAT
Serial Title: Italian Journal of Geosciences
Serial Volume: 133
Serial Issue: 3
Title: Natural sources of carbon dioxide and methane from the fluvio-lacustrine sediments of the Fucino Plain (central Italy); evidence from stable carbon isotopes
Affiliation: CNR, Istituto di Geologia Ambientale e Geoingegneria, Rome, Italy
Pages: 439-444
Published: 201410
Text Language: English
Publisher: Societa Geologica Italiana, Rome, Italy
References: 33
Accession Number: 2014-105279
Categories: Geochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch map
N41°55'00" - N42°06'00", E13°13'60" - E13°25'60"
Country of Publication: Italy
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Societa Geologica Italiana. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201452
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