The Pliocene-age Stirone River hydrocarbon chemoherm complex (Northern Apennines, Italy)
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Publication Details
Author list: Cau S, Franchi F, Roveri M, Taviani M
Publisher: Elsevier
Place: OXFORD
Publication year: 2015
Journal: Marine and Petroleum Geology (0264-8172)
Journal acronym: MAR PETROL GEOL
Volume number: 66
Start page: 582
End page: 595
Number of pages: 14
ISSN: 0264-8172
eISSN: 1873-4073
Languages: English-Great Britain (EN-GB)
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Abstract
The Stirone River section in the Italian Northern Apennines hosts a rare example of Pliocene age hydrocarbon-imprinted carbonates in the Mediterranean Basin associated with deep-water hemipelagic lithologies. These include meter-sized, dolomite-cemented chimneys, micritic brecciated limestones, lucina-mudstones and chemosymbiotic bivalve shells. Some such chimneys show delta C-13 values as low as -37.5 parts per thousand VPDB, suggesting subsurface precipitation of authigenic dolomite induced by anaerobic oxidation of methane triggered by consortia of sulphate reducing bacteria. These carbonates are interpreted as part of the plumbing system related to hydrocarbon expulsion onto the seafloor, resulting from hydrocarbon-enriched defluidization processes dated at an interval at 3.6-3.3 Ma and associated with the thrust-related "Salsomaggiore structure". (C) 2015 Elsevier Ltd. All rights reserved.
Keywords
Apennines, carbonates, Chimneys, Deep water, Hydrocarbon, Italy, Mediterranean basin, Pliocene
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