Methane-Derived Authigenic Carbonates (MDAC) in northern-central Adriatic Sea: Relationships between reservoir and methane seepages

Capozzi, Rossella; Guido, Francesco; Oppo, Davide; Gabbianelli, Giovanni

doi:10.1016/j.margeo.2012.06.006

Cited by 30 publications

(24 citation statements)

References 51 publications

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“…The stable carbon range is consistent with authigenic carbonates formed through the incorporation of carbon derived from anaerobic methane oxidation Roberts et al, 1987;Kulm and Suess, 1990;Aharon, 1994;Kelly et al, 1995;von Rad et al, 1996;Aloisi et al, 2000Aloisi et al, , 2002aElvert et al, 2000;Naehr et al, 2000;Greinert et al, 2001;Peckmann et al, 2001;Taviani, 2001;Gontharet et al, 2007;Campbell et al, 2008;Cangemi et al, 2010;Feng and Roberts, 2010;Ivanov et al, 2010a, b;Himmler et al, 2011;Capozzi et al, 2012). The presence of pyrite might represent a legacy of sulphate reduction in the formative environment of such carbonates (e.g.…”

Section: Seep Carbonatessupporting

confidence: 55%

The Gela Basin pockmark field in the strait of Sicily (Mediterranean Sea): chemosymbiotic faunal and carbonate signatures of postglacial to modern cold seepage

et al. 2013

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The geo-biological exploration of a pockmark field located at ca. 800 m below sea level in the Gela basin (Strait of Sicily, Central Mediterranean) provided a relatively diverse chemosymbiotic community and methane-imprinted carbonates. To date, this is the first occurrence of such a type of specialised deep-water cold-seep communities recorded from this key region, before documented in the Mediterranean as rather disjunct findings in its eastern and westernmost basins. The thiotrophic chemosymbiotic organisms recovered from this area include empty tubes of the vestimentiferan Lamellibrachia sp., loose and articulated shells of lucinids (Lucinoma kazani, Myrtea amorpha), vesicomyids (Isorropodon perplexum), and gastropods (Taranis moerchii). A callianassid decapod (Calliax sp.) was consistently found alive in large numbers in the pockmark mud. Their post-mortem calcified parts mixed with molluscs and subordinately miliolid foraminifers form a distinct type of skeletal assemblage. Carbonate concretions display δ¹³C values as low as −40‰ PDB suggesting the occurrence of light hydrocarbons in the seeping fluids. Since none of the truly chemosymbiotic organisms was found alive, although their skeletal parts appear at times very fresh, some specimens have been AMS-¹⁴C dated to shed light on the historical evolution of this site. Lamellibrachiav and Lucinoma are two of the most significant chemosymbiotic taxa reported from various Mediterranean cold seep sites (Alboran Sea and Eastern basin). Specimens from station MEDCOR78 (pockmark #1, Lat. 36°46´10.18" N, Long. 14°01´31.59" E, 815 m below sea level) provided ages of 11736 ± 636 yr cal BP (Lamellibrachia sp.), and 9609.5 ± 153.5 yr cal BP (L. kazani). One shell of M. amorpha in core MEDCOR81 (pockmark #6, Lat 36°45´38.89" N, Long 14°00´07.58" E, 822 m below sea level) provided a sub-modern age of 484 ± 54 yr cal BP. These ages document that fluid seepage at this pockmark site has been episodically sustaining thiotrophic macrobenthic communities since the end of the Younger Dryas stadial up to sub-recent times

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Section: Seep Carbonatessupporting

confidence: 55%

The Gela Basin pockmark field in the strait of Sicily (Mediterranean Sea): chemosymbiotic faunal and carbonate signatures of postglacial to modern cold seepage

et al. 2013

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“…3 carbonates testify the present-day or past occurrence of petroleum generation systems (Capozzi et al, 2012;Oppo et al, 2013;Unterseh, 2013).…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

“…It is documented in modern and ancient marine sedimentary basins worldwide particularly, but not exclusively, in compressive tectonic regimes at convergent margins (e.g., Taviani, 2001;Pinheiro et al, 2003;Nyman et al, 2010;Capozzi et al, 2012). Microbially mediated anaerobic oxidation of methane (AOM) and sulphate reduction (SR) increase the pore water alkalinity, favouring the precipitation of methane-derived authigenic carbonates (MDAC) (e.g.…”

Section: Introductionmentioning

confidence: 99%

Mineralogy, geochemistry and petrography of methane-derived authigenic carbonates from Enza River, Northern Apennines (Italy)

Viola

Oppo

Franchi

et al. 2015

Marine and Petroleum Geology

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“…In the western part of the central Mediterranean Sea, the Tyrrhenian Sea, evidences of fluid seepage are limited to the Adriatic Sea (Geletti et al, 2008), Strait of Sicily, Sardinian Margin (Dalla Valle and Gamberi, 2011) and Malta Plateau (Savini et al, 2009;Micallef et al, 2011;Taviani et al, 2013), mostly in the form of pockmarks, occasionally associated with methane-imprinted carbonates (Capozzi et al, 2012;Cangemi et al, 2010;Angeletti et al, 2015;Taviani et al, 2015). In the westernmost part of the Central Mediterranean Sea, the Tyrrhenian Sea, little evidence of past and present fluid circulation was found in the deep sea, except for the Paola Ridge, along the NW Calabrian margin (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Although authigenic calcite and aragonite have commonly been used for geochemical characterization of seeping fluids and paleoenvironmental reconstruction at recent (e.g., Himmler et al, 2010;Peckmann et al, 2001;Peckmann and Thiel, 2004;Capozzi et al, 2012;Magalhães et al, 2012) and fossil (e.g., Blumenberg et al, 2015;Cau et al, 2015;Viola et al, 2015) methane seeps, the occurrence of authigenic siderite at seepage sites is less documented (Fritz et al, 1971;Curtis et al, 1972;Mozley and Wersin, 1992;Rongemaille et al, 2011). Siderite nodules have been reported in modern settings associated with methane seepage (Niger delta; Rongemaille et al, 2011) or methane hydrate decomposition (Black Outer Ridge; Matsumoto, 1989), and with highly ferruginous, low-sulfate, anoxic lake waters (e.g., Wittkop et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Authigenic minerals from the Paola Ridge (southern Tyrrhenian Sea): Evidences of episodic methane seepage

Franchi

Rovere

Gamberi

et al. 2017

Marine and Petroleum Geology

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a b s t r a c tPaola Ridge, along the NW Calabrian margin (southern Tyrrhenian Sea), is one of the few reported deep sea sites of precipitation of authigenic carbonates in the Tyrrhenian Sea. Here, the changing composition of the seeping fluids and the dynamic nature of the seepage induced the precipitation of pyrite, siderite and other carbonate phases. The occurrence of this array of authigenic precipitates is thought to be related to fluctuation of the sulfate-methane transition zone (SMTZ).Concretions of authigenic minerals formed in the near sub-bottom sediments of the Paola Ridge were investigated for their geochemical and isotopic composition. These concretions were collected in an area characterized by the presence of two alleged mud volcanoes and three mud diapirs. The mud diapirs are dotted by pockmarks and dissected by normal faults, and are known for having been a site of fluid seepage for at least the past 40 kyrs. Present-day venting activity occurs alongside the two alleged mud volcanoes and is dominated by CO 2 -rich discharging fluids. This discover led us to question the hypothesis of the mud volcanoes and investigate the origin of the fluids in each different domed structure of the study area.In this study, we used stable isotopes (carbon and oxygen) of carbonates coupled with rare earth element (REE) composition of different carbonate and non-carbonate phases for tracing fluid composition and early diagenesis of authigenic precipitates. The analyses on authigenic precipitates were coupled with chemical investigation of venting gas and sea-water.Authigenic calcite/aragonite concretions, from surficial sediments on diapiric structures, have depleted values. The siderite REE pattern shows consistent LREE (light REE) fractionation, MREE (medium REE) enrichment and positive Gd and La anomalies. As shown by the REE distribution, the 13 C-depleted composition and their association with chemosymbiotic fauna, calcite/aragonite precipitated at time of moderate to high methane flux close to the seafloor, under the influence of bottom seawater. Authigenic siderite, on the other hand, formed in the subseafloor, during periods of lower gas discharges under prolonged anoxic conditions within sediments in equilibrium with 13 C-rich dissolved inorganic carbon (DIC) and 18 O-rich water, likely related to methanogenesis and intermittent venting of deep-sourced CO 2 .

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Methane-Derived Authigenic Carbonates (MDAC) in northern-central Adriatic Sea: Relationships between reservoir and methane seepages

Cited by 30 publications

References 51 publications

The Gela Basin pockmark field in the strait of Sicily (Mediterranean Sea): chemosymbiotic faunal and carbonate signatures of postglacial to modern cold seepage

The Gela Basin pockmark field in the strait of Sicily (Mediterranean Sea): chemosymbiotic faunal and carbonate signatures of postglacial to modern cold seepage

Mineralogy, geochemistry and petrography of methane-derived authigenic carbonates from Enza River, Northern Apennines (Italy)

Authigenic minerals from the Paola Ridge (southern Tyrrhenian Sea): Evidences of episodic methane seepage

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