Methane seepages recorded in benthic foraminifera from Miocene seep carbonates, Northern Apennines (Italy)

Panieri, Giuliana; Camerlenghi, Angelo; Conti, Stefano; Pini, Gian Andrea; Cacho, Isabel

doi:10.1016/j.palaeo.2009.10.006

Cited by 35 publications

(33 citation statements)

References 61 publications

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“…Low diversity and high dominance is also observed in some fossil seep areas (Panieri, 2005;Martin et al, 2007;Panieri et al, 2009Panieri et al, , 2012. Martin et al (2007Martin et al ( , 2010 and Panieri et al (2014) also stressed that there are no endemic benthic foraminiferal…”

Section: Origin Of the El Alcor Carbonatesmentioning

confidence: 86%

An enigmatic kilometer-scale concentration of small mytilids (Late Miocene, Guadalquivir Basin, S Spain)

Aguirre

Braga

Martín

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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Upper Miocene heterozoan carbonates crop out extensively in a NE-SW-trending belt (42 km long and 1.5-8 km wide) along the so-called El Alcor topographic high, from Carmona to Dos Hermanas (Seville, S Spain). These carbonates formed at the southern active margin of the Guadalquivir Basin, the foreland basin of the Betic Cordillera.They change to marls basinward (NE) and to sands landward (SE and SW). Therefore, carbonate production was constrained to a limited area in an otherwise siliciclastic shelf.The carbonates (up to 40 m thick) overlie a gradually coarsening-upward succession of marls followed by silts and sandstones. The carbonate sequence can be divided into three subunits corresponding, from bottom to top, to lowstand, transgressive, and highstands system tracts deposits. The lower subunit, exhibiting extensive trough crossbedding, is interpreted as a shallow-water bar deposit. The intermediate subunit onlaps underlying sediments and was deposited in deeper, low-turbulence conditions. The upper subunit deposits accumulated in a well-oxygenated outer platform based on benthic foraminiferal assemblages. The presence of hummocky and swaley crossstratification in these latter deposits suggests that they were affected by storms.Pervasive fluid-escape structures are also observed throughout the carbonates.The three subunits consist of bioclastic packstones to rudstones made up of abundant fragments of small mytilids. Isotopic data from serpulid polychaete Ditrupa tubes show 13 C-depleted values (up to -16.1‰), whereas  18 O yields normal marine values. Additional isotopic data on shells of scallops, oysters, and small mussels, as well as bulk sediment, show diagenetic alterations. Based on actualistic examples of massive concentrations of mussels, the nearly monospecific composition of the El Alcor deposits, together with negative  13 C values of Ditrupa tubes, indicates that cold seeps A C C E P T E D M A N U S C R I P T

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Section: Origin Of the El Alcor Carbonatesmentioning

confidence: 86%

An enigmatic kilometer-scale concentration of small mytilids (Late Miocene, Guadalquivir Basin, S Spain)

Aguirre

Braga

Martín

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…However, the poor preservation of foraminifera precludes reliable counts. In a number of samples where benthic foraminifera could be quantified (Panieri et al, 2009), reliable counts of planktonic foraminifera were not feasible.…”

Section: Biostratigraphy and Paleobathymetrymentioning

confidence: 99%

Late Miocene seep-carbonates and fluid migration on top of the Montepetra intrabasinal high (Northern Apennines, Italy): Relations with synsedimentary folding

Conti

Fontana

Mecozzi

et al. 2010

Sedimentary Geology

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“…AMO is attributed to a consortium of CH 4 -oxidizing archaea and sulfate-reducing bacteria bicarbonate with isotopically depleted carbon in the calcitic shell during growth (Hill et al, 2003 and2004b). Carbon isotopic composition of benthic foraminifera may also be influenced by the carbon isotope ratios of food source (Panieri et al, 2009). The presence of 2,6,10,15,19-pentamethylicosane (PMI) an archaeal membrane lipid biomarker with extremely depleted carbon isotope ratios (-106 to -139 ‰ VPDB) suggest AOM and enhanced abundances of methanotrophic archaeal biomass governed by methane emission (Orphan et al, 2001;Thiel et al, 2001;Peckmann and Thiel, 2004;Zhiguang and Wang, 2006).…”

Section: Methane Emission and C Isotope Perturbationmentioning

confidence: 99%

“…Marked enrichment in methane concentrations in ancient water column/ atmosphere has been inferred from the late Neoproterozoic (Kennedy et al, 2008), early Jurassic (Kemp et al, 2005), early Cretaceous (Jahren et al, 2001), Paleocene-Eocene (Dickens et al, 1995), Miocene (Panieri et al, 2009) and late Quaternary (Kennett et al, 2000;Hinrichs et al, 2003;De-Gadriel-Thoron et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Gas hydrate destabilization and methane release events in the Krishna–Godavari Basin, Bay of Bengal

Joshi¹,

Mazumdar²,

Peketi³

et al. 2014

Marine and Petroleum Geology

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Methane release events have been linked to global warming, alteration of the carbon cycle and influence on biota. However, unequivocal evidence of paleomethane release events are limited. We report several negative carbon stable isotope excursions in planktic and benthic foraminifera in a core (MD161-8) from the Krishna-Godavari (K-G) Basin, Bay of Bengal. The most negative δ 13 C spikes are recorded during the marine isotope stages MIS-4 and at the transition of MIS-5 to 4. Occurrence of highly 13 C depleted (average δ 13 C = -48±2.4 ‰ VPDB) authigenic high magnesian calcite are also reported within this time window from the core MD161-8. In the present work an unequivocal explanation for the observed 13 C depletion in the marine planktic and benthic foraminifera is difficult to achieve solely from the optical/ electron microscopy or C-O stable isotope ratio analyses due to possible influence of diagenetic alteration. We attribute the observed episodic methane expulsion events, as inferred from the negative δ 13 C excursions and earlier reports on the occurrence chemosynthetic bivalves and Mo concentration anomaly to the destabilization of the base of gas hydrate stability zone (BGHSZ). Sea level drop and shale tectonics induced focused fluid flow are the two possible causes of hydrate destabilization discussed here. Shale tectonics were possibly responsible for creating fault systems which acted as the conduit for gas flow through the sediment column and subsequent seepage. Shale and salt tectonics in the passive continental margins being a globally observed phenomenon, its role as an important driving force for enhanced methane emission needs detailed investigation to understand the climatic perturbations through geologic time. Additional evidence of methane emission from site MD161-15 further supports the link between shale tectonics and methane emission.

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Methane seepages recorded in benthic foraminifera from Miocene seep carbonates, Northern Apennines (Italy)

Cited by 35 publications

References 61 publications

An enigmatic kilometer-scale concentration of small mytilids (Late Miocene, Guadalquivir Basin, S Spain)

An enigmatic kilometer-scale concentration of small mytilids (Late Miocene, Guadalquivir Basin, S Spain)

Late Miocene seep-carbonates and fluid migration on top of the Montepetra intrabasinal high (Northern Apennines, Italy): Relations with synsedimentary folding

Gas hydrate destabilization and methane release events in the Krishna–Godavari Basin, Bay of Bengal

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