Petrography and stable isotope aspects of cold-vent activity imprinted on Miocene-age ?calcari aLucina? from Tuscan and Romagna Apennines, Italy

Terzi, Claudia; Lucchi, Federico; Vai, Gian Battista; Aharon, Paul

doi:10.1007/bf01203729

Cited by 58 publications

(31 citation statements)

References 22 publications

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“…These limes tones are interbedded with turbidites and hemipelagites deposited in foredeep basins from the Early to Late Miocene (Terzi et al, 1994). Carbonate precipitation occurred in bathyal depths supposedly deeper than 200 m (Aharon and Sen Gupta 1994).…”

Section: Methodsmentioning

confidence: 99%

“…After their discovery in contemporary settings, different fossil limes tones ranging from Carboniferous to Holocene have been interpreted as methane-derived carbonates (Beauchamp et al, 1989;Jl'lrgensen, 1989;von Bitter et al, 1990;Gaillard et al , 1992;Terzi et al, 1994;Kelly et al, 1995). These interpretations are mainly based on 8l3Ccarbonate values, sometimes supported by the content of preserved fossil assemblages including lucinid and vesicomyid clams, or modiolid musseis, and vestimentiferan worm tubes (Campbell et 3960 V. Thiel et al al., 1993, Terzi et al, 1994. The distinct ecological features observed in present-day settings prompted us to study the organic compounds included in their proposed ancient counterparts.…”

Section: Introductionmentioning

confidence: 99%

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Highly isotopically depleted isoprenoids: molecular markers for ancient methane venting

Thiel

Peckmann²,

Seifert

et al. 1999

Geochimica et Cosmochimica Acta

233

150

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Abstract-We propose that organic compounds found in a Miocene limestone from Marmorito (Northem Italy) are source markers for organic matter present in aneient methane vent systems (cold seeps). The limestone contains high concentrations of the tail-to-taillinked, acyclic C 20 isoprenoid 2,6,11,15-tetramethylhexadecane (crocetane), a C 25 homolog 2,6,10,15,19-pentamethylicosane (PME), and a distinctive glycerol ether lipid containing 3,7,1l,15-tetramethylhexadecyl (phytanyl-) moieties. The chemical structures of these biomarkers indicate a common origin from archaea. Their extreme1y l3C-depleted isotope compositions (8 13 C "'" -108 to -115.6%0 PDB) suggest that the respective archaea have directly or indirectly introduced isotopically depleted, methane-derived carbon into their biomass. We postulate that a second major cluster of biomarkers showing heavier isotope values (8 l3 C "'" -88%0) is derived from sulfate-redueing bacteria (SRB). The observed biomarkers sustain the idea that methanogenic bacteria, in a syntrophic community with SRB, are responsible for the anaerobic oxidation of methane in marine sediments. Marmorito may thus represent a conceivable aneient scenario for methane consumption performed by a defined, two-membered bacterial consortium: (1) archaea that perform reversed methanogenesis by oxidizing methane and produeing CO 2 and H 2 ; and (2) SRB that consume the resulting H 2 . Furthermore, the respective organic molecules are, unlike other compounds, tightly bound to the crystalline carbonate phase. The Marmorito carbonates can thus be regarded as "cold seep microbialites" rather than mere "authigenic" carbonates.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly isotopically depleted isoprenoids: molecular markers for ancient methane venting

Thiel

Peckmann²,

Seifert

et al. 1999

Geochimica et Cosmochimica Acta

233

150

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“…This view changed after the first discovery of faunal communities at methane seeps in the deep Gulf of Mexico with similarly large bivalves (Paull et al, 1984) and the recognition that methane seep carbonates can be identified based on their distinctive, light carbon isotope signature (Hovland et al, 1987). The 'Calcari a Lucina' deposits throughout Italy are now considered as ancient deep-water methane seep deposits Conti et al, 1993;Terzi, 1993;Aharon and Sen Gupta, 1994;Berti et al, 1994;Ricci Lucchi and Vai, 1994;Taviani, 1994;Terzi et al, 1994;Peckmann et al, 1999;Clari et al, 2004b;Conti et al, 2004. Despite this wealth of geologic literature on these deposits, modern studies on the macrofauna are relatively rare (Moroni, 1966;Taviani, 1994Taviani, , 2011Taviani, , 2014Taviani et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Chemosymbiotic bivalves from Miocene methane-seep carbonates in Italy

Kiel¹,

Taviani

2017

J. Paleontol.

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Abstract.-Eleven species of chemosymbiotic bivalves are reported from middle to late Miocene methane seep deposits ('Calcari a Lucina') in the Italian Apennines, including seven new species and one new genus. The new species are Bathymodiolus (s.l.) moroniae and B. (s.l.) miomediterraneus among the Bathymodiolinae and Archivesica aharoni, A. apenninica, A. strigarum, and 'Pliocardia' italica among the Vesicomyidae; specimens from the middle Miocene of Deruta are reported as Archivesica aff. aharoni. Samiolus iohannesbaptistae new genus new species is introduced for an unusual mytilid with a commarginally ribbed surface, which might be the first non-bathymodiolin mytilid obligate to the seep environment. The two large lucinid species from which these deposits derived their informal name 'Calcari a Lucina' are identified as Meganodontia hoernea (Des Moulins, 1868) and Lucinoma perusina (Sacco, 1901). With Chanellaxinus sp., we report the first thyasirid from a Neogene deep-water seep deposit in Italy and the first fossil occurrence of this genus.

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“…Detection of fossil seep activity is primarily based on analogy with modern seeps; excellent indicators are shells of specialized biota (clams, tubeworms) and authigenic carbonates which often have d 13 C signatures of À30 to À60% Peedee belemnite (PDB). Using this approach fossil seeps have been detected in numerous carbonate sequences, e.g., from the Miocene in Italy [Terzi et al, 1994;Thiel et al, 1999], the Cretaceous in northern Canada [Beauchamp et al, 1989], and the Middle Devonian of Morocco .…”

Section: Introductionmentioning

confidence: 99%

“…other processes such as microbial methane oxidation to explain the 12 C enrichment. Our d 13 C data plot into the range of recent and fossil seep carbonates [e.g., Bohrmann et al, 1998;Stakes et al, 1999;Terzi et al, 1994;Peckmann et al, 1999] where anaerobe methane oxidation is known to take place. The significance of microbial induced anaerobic methane oxidation for authigenic carbonate precipitation has been demonstrated for recent as well as fossil seeps [Borowski et al, 1997;Thiel et al, 1999].…”

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confidence: 99%

Stable carbon isotope records of carbonates tracing fossil seep activity off Indonesia

Wiedicke

Weiss

2006

Geochem Geophys Geosyst

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[1] Stable isotope records of carbonates from up to 20 m long sediment cores from the forearc basin of the Sunda arc display significant 13 C depletion, deviating from expected normal marine levels by 5 to 40% (Peedee belemnite (PDB)). This depletion is interpreted to be caused by methane seepage and associated authigenic carbonate precipitation in sediments near the seafloor. About 2-mm-sized globular carbonate particles found in isotopically depleted samples support this interpretation. Their shape suggests microbial mediation of the precipitation process. Investigation of benthic foraminiferal assemblages in cores which record seep influence indicate times of high abundance with an up to twentyfold increase of the population and a dominance of opportunistic infaunal taxa. We relate these ''events'' to the seepage of methane, thus providing an understanding of the duration and age of this postdepositional process: postulated seep activity is most intense between 3-7 kyr B.P. and 27-33 kyr B.P. As cores with 13 C isotope depletion were taken atop active fault zones in the forearc, we suggest a tectonic control of the seepage. Records of seep activity thus may have the potential to archive imprints of tectonic activity.

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Petrography and stable isotope aspects of cold-vent activity imprinted on Miocene-age ?calcari aLucina? from Tuscan and Romagna Apennines, Italy

Cited by 58 publications

References 22 publications

Highly isotopically depleted isoprenoids: molecular markers for ancient methane venting

Highly isotopically depleted isoprenoids: molecular markers for ancient methane venting

Chemosymbiotic bivalves from Miocene methane-seep carbonates in Italy

Stable carbon isotope records of carbonates tracing fossil seep activity off Indonesia

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