Methane-related authigenic carbonates from the Black Sea: geochemical characterisation and relation to seeping fluids

Mazzini, Adriano; Ivanov, M.K.; Parnell, John; Stadnitskaia, Alina; Cronin, Bryan T.; Poludetkina, E. N.; Mazurenko, L.; Weering, Tjeerd C.E. van

doi:10.1016/j.margeo.2004.08.001

Cited by 124 publications

(88 citation statements)

References 43 publications

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“…41). Microbial methanogenesis by the reduction of CO 2 is the source of the lightest methane (δ 13 C < − 60‰) and is accompanied by residual CO 2 enriched for δ 13 C. The δ 13 C values of carbonates associated with shallow gas hydrate deposits and gas seeps are often reported to be very small (~ − 20 to − 50‰), because the oxidation of isotopically light methane is the main source of CO 2 in these carbonates 39,42 . In contrast, the carbon isotope ratio of calcite associated with chibaite is found to be relatively 13 C-enriched, at + 3.5 ± 0.2‰.…”

Section: Discussionmentioning

confidence: 99%

New silica clathrate minerals that are isostructural with natural gas hydrates

Momma

Ikeda

Nishikubo³

et al. 2011

Nat Commun

131

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silica clathrate compounds (clathrasils) and clathrate hydrates are structurally analogous because both materials have framework structures with cage-like voids occupied by guest species. The following three structural types of clathrate hydrates are recognized in nature: cubic structure I (sI); cubic structure II (sII); and hexagonal structure H (sH). In contrast, only one naturally occurring silica clathrate mineral, melanophlogite (sI-type framework), has been found to date. Here, we report the discovery of two new silica clathrate minerals that are isostructural with sII and sH hydrates and contain hydrocarbon gases. Geological and mineralogical observations show that these silica clathrate minerals are traces of lowtemperature hydrothermal systems at convergent plate margins, which are the sources of thermogenic natural gas hydrates. Given the widespread occurrence of submarine hydrocarbon seeps, silica clathrate minerals are likely to be found in a wide range of marine sediments.

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Section: Discussionmentioning

confidence: 99%

New silica clathrate minerals that are isostructural with natural gas hydrates

Momma

Ikeda

Nishikubo³

et al. 2011

Nat Commun

131

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“…In these cases the activity of methanigen bacteria is mainly involved in the biochemical transformation of organic sediments accumulated in previous years. In the case of marine sediments these bacteria use the reduction of sulfate and nitrate as metabolic source of oxygen (Sloan & Koh, 2008 (Diaconescu e al., 2001;Mazzini et al, 2004;Sassen & Macdonald, 1994;Woodside et al, 2003) or the biochemical (R = 10 3 -10 5 ) origin of gases (Claypool & Kvenvolden, 1983). There are no sufficient proofs to support the hypothesis that origins of methane and its hydrate is a surviving memory of Earth primordial reducing atmosphere.…”

Section: Wwwintechopencommentioning

confidence: 99%

The Role of Methane Emissions on Ancient and Present Climatic Changes

Barone¹,

Chianese²,

Riccio³

2011

Planet Earth 2011 - Global Warming Challenges and Opportunities for Policy and Practice

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“…Gas hydrates are one of the cleaner forms of energy. Methane is their major contributing gas in sediments [11,12]. Gas hydrates are seen as future generation energy resource [2].…”

Section: Introductionmentioning

confidence: 99%

“…Gas hydrates are seen as future generation energy resource [2]. Keeping into this various studies have been reported gas hydrates as potential energy resource [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. According to USA department of energy, if only feeble amount of the methane stored in the hydrates can be obtained, it will be more than the current domestic supply of USA of natural gas [17,18].…”

Section: Introductionmentioning

confidence: 99%