Soil CO2 degassing along tectonic structures of Mount Etna (Sicily): the Pernicana fault |
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| Institution: | 1. ULg, GxABT, Biosystems Engineering Department, Belgium;2. CRA-W, Belgium;1. Dipartimento di Scienze–Sezione Geologia, Università Roma Tre, Largo San Leonardo Murialdo 1, Roma, Italia;2. Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Roma 1, Via Vigna Murata 509, Roma, Italia;3. Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, Via Donato Creti 12, Bologna, Italia, Italy;4. Parco Regionale dell''Appia Antica, via Appia Antica 42, Roma, Italy;5. Geological Survey of Japan, AIST Site 7, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan;1. Dipartimento di Scienze della Terra, dell''Ambiente e delle Risorse (DiSTAR), Università degli Studi di Napoli Federico II, Via Mezzocannone 8, 80134 Napoli, Italy;2. Institute of Geodynamics, Romanian Academy, 19-21, Jean-Luis Calderon str., Bucharest 020032, Romania;3. Institute of Earth Sciences, Academia Sinica, Taipei 11529, Taiwan;4. Department of Geosciences, National Taiwan University (NTU), Taipei 10617, Taiwan;5. Dipartimento di Scienze della Terra, Università degli Studi di Roma La Sapienza, P.le Aldo Moro 5, 00185 Roma, Italy;6. CNR, Istituto di Geologia Ambientale e Geoingegneria (IGAG), c/o Dipartimento di Scienze della Terra, Università degli Studi di Roma La Sapienza, P.le A. Moro 5, 00185 Roma, Italy |
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| Abstract: | Carbon dioxide emissions from the soil have been investigated along lines of equally spaced sampling points perpendicular to the Pernicana fault on Mt Etna. Anomalous values of soil CO2 have been found not only along the fault plane, but also along directions parallel to it, both to the N and to the S of the main fault. The acquired data seem to reveal a shallow step-like geometry of the Pernicana fault system with parallel faults being generally not deeper than the interface between Etna's volcanic cover and its sedimentary basement (a few hundred meters). The distribution of the anomalous CO2 emissions has also revealed that the Pernicana fault continues at least as far as the Ionian sea, in an area where only sedimentary rocks crop out. This finding would suggest that the main structure is deeper than the base of the volcanic cover, thus cutting at least the uppermost portion of Etna's sedimentary basement.Isotopic analyses of C carried out in samples from locations of high CO2, seem to indicate that the emitted CO2 is a mixture of an organic shallow component and a minor deeper magmatic one.Both chemical and isotopic data on soil gases emitted in the easternmost part of the studied area distinguished another tectonic structure which seems to be much deeper than the Pernicana fault and is roughly directed NNE-SSW, this direction being coincident with an important structural trend of eastern Sicily. |
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