CO<sub>2</sub>-Degassing Carbonate Conduits in Early Pleistocene Marine Clayey Deposits in Southwestern Umbria (Central Italy)
Early Pleistocene marine deposits in southwestern Umbria (Orvieto–Allerona area, Italy) recently revealed the presence of more than forty carbonate conduits distributed over 2 km along the Paglia riverbed. In order to investigate their origins, analyses of their mineralogy, δ<sup>18</sup>...
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MDPI AG
2022-06-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/12/7/819 |
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| author | Angela Baldanza Roberto Bizzarri Chiara Boschi Federico Famiani Francesco Frondini Marco Lezzerini Steven Rowland Paul A. Sutton |
| author_facet | Angela Baldanza Roberto Bizzarri Chiara Boschi Federico Famiani Francesco Frondini Marco Lezzerini Steven Rowland Paul A. Sutton |
| author_sort | Angela Baldanza |
| collection | DOAJ |
| description | Early Pleistocene marine deposits in southwestern Umbria (Orvieto–Allerona area, Italy) recently revealed the presence of more than forty carbonate conduits distributed over 2 km along the Paglia riverbed. In order to investigate their origins, analyses of their mineralogy, δ<sup>18</sup>O and δ<sup>13</sup>C stable isotopes, and organic geochemistry were conducted. All the carbonate conduits are made of euhedral microcrystals of dolomite with subordinate quartz, plagioclases, and micas. The stable carbon and oxygen isotope values of the bulk concretionary carbonates range from −0.57 to +4.79‰ (δ<sup>13</sup>C) and from +1.58 to +4.07‰ (δ<sup>18</sup>O), respectively. The lack of organic geochemical biomarkers of anaerobic methane oxidation (AOM) and the very low values of extractable organic matter suggest a non-biological origin for the dolomite precipitation. The latter is probably related to the rise of volcanic carbon dioxide due to the incipient Vulsini magmatism recorded in Early Pleistocene marine deposits all around the study site. The spatial distribution of the structures indicates that the upward migration of the CO<sub>2</sub> was controlled by the fault system, while the vertical development of the conduits suggests that carbon dioxide degassing occurred, with multiple events. Carbon dioxide was probably stored in pockets within the clayey sediments until the pressure exceeded the eruptive threshold. These structures represent the first documentation of a volcanic carbon dioxide marine seepage event in the Umbria region. |
| first_indexed | 2024-03-09T10:14:19Z |
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| language | English |
| last_indexed | 2024-03-09T10:14:19Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-577fada7f2c24bb4b62d192c0dc576cb2023-12-01T22:29:01ZengMDPI AGMinerals2075-163X2022-06-0112781910.3390/min12070819CO<sub>2</sub>-Degassing Carbonate Conduits in Early Pleistocene Marine Clayey Deposits in Southwestern Umbria (Central Italy)Angela Baldanza0Roberto Bizzarri1Chiara Boschi2Federico Famiani3Francesco Frondini4Marco Lezzerini5Steven Rowland6Paul A. Sutton7Department of Physics and Geology, University of Perugia, via A. Pascoli, 06123 Perugia, ItalyDepartment of Physics and Geology, University of Perugia, via A. Pascoli, 06123 Perugia, ItalyInstitute of Geosciences and Earth Resources, National Research Council of Italy, 56127 Pisa, ItalyParco e Museo Vulcanologico, Piazza Roma 1, 05010 Terni, ItalyDepartment of Physics and Geology, University of Perugia, via A. Pascoli, 06123 Perugia, ItalyDepartment of Earth Sciences, Università di Pisa, Via S. Maria 53, 56126 Pisa, ItalySchool of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UKSchool of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UKEarly Pleistocene marine deposits in southwestern Umbria (Orvieto–Allerona area, Italy) recently revealed the presence of more than forty carbonate conduits distributed over 2 km along the Paglia riverbed. In order to investigate their origins, analyses of their mineralogy, δ<sup>18</sup>O and δ<sup>13</sup>C stable isotopes, and organic geochemistry were conducted. All the carbonate conduits are made of euhedral microcrystals of dolomite with subordinate quartz, plagioclases, and micas. The stable carbon and oxygen isotope values of the bulk concretionary carbonates range from −0.57 to +4.79‰ (δ<sup>13</sup>C) and from +1.58 to +4.07‰ (δ<sup>18</sup>O), respectively. The lack of organic geochemical biomarkers of anaerobic methane oxidation (AOM) and the very low values of extractable organic matter suggest a non-biological origin for the dolomite precipitation. The latter is probably related to the rise of volcanic carbon dioxide due to the incipient Vulsini magmatism recorded in Early Pleistocene marine deposits all around the study site. The spatial distribution of the structures indicates that the upward migration of the CO<sub>2</sub> was controlled by the fault system, while the vertical development of the conduits suggests that carbon dioxide degassing occurred, with multiple events. Carbon dioxide was probably stored in pockets within the clayey sediments until the pressure exceeded the eruptive threshold. These structures represent the first documentation of a volcanic carbon dioxide marine seepage event in the Umbria region.https://www.mdpi.com/2075-163X/12/7/819carbonate conduitsCO<sub>2</sub> emissioninorganic originvolcanismtectonicsearly Pleistocene |
| spellingShingle | Angela Baldanza Roberto Bizzarri Chiara Boschi Federico Famiani Francesco Frondini Marco Lezzerini Steven Rowland Paul A. Sutton CO<sub>2</sub>-Degassing Carbonate Conduits in Early Pleistocene Marine Clayey Deposits in Southwestern Umbria (Central Italy) Minerals carbonate conduits CO<sub>2</sub> emission inorganic origin volcanism tectonics early Pleistocene |
| title | CO<sub>2</sub>-Degassing Carbonate Conduits in Early Pleistocene Marine Clayey Deposits in Southwestern Umbria (Central Italy) |
| title_full | CO<sub>2</sub>-Degassing Carbonate Conduits in Early Pleistocene Marine Clayey Deposits in Southwestern Umbria (Central Italy) |
| title_fullStr | CO<sub>2</sub>-Degassing Carbonate Conduits in Early Pleistocene Marine Clayey Deposits in Southwestern Umbria (Central Italy) |
| title_full_unstemmed | CO<sub>2</sub>-Degassing Carbonate Conduits in Early Pleistocene Marine Clayey Deposits in Southwestern Umbria (Central Italy) |
| title_short | CO<sub>2</sub>-Degassing Carbonate Conduits in Early Pleistocene Marine Clayey Deposits in Southwestern Umbria (Central Italy) |
| title_sort | co sub 2 sub degassing carbonate conduits in early pleistocene marine clayey deposits in southwestern umbria central italy |
| topic | carbonate conduits CO<sub>2</sub> emission inorganic origin volcanism tectonics early Pleistocene |
| url | https://www.mdpi.com/2075-163X/12/7/819 |
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