Labile barite contents and dissolved barium concentrations on Blake Ridge: New perspectives on barium cycling above gas hydrate systems

Snyder, G. T.; Dickens, Gerald R.; Castellini, D. G.

doi:10.1016/j.gexplo.2007.06.001

Cited by 43 publications

(32 citation statements)

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“…These observations indicate that barite deposition might be an important process along many continental margins and may have affected the global marine barium cycle in the geological past (e.g. Castellini et al, 2006;Dickens, 2001;Dickens et al, 2003;McQuay et al, 2008;Snyder et al, 2007;Torres et al, 1996aTorres et al, ,b, 2002Torres et al, , 2003.…”

Section: Introductionmentioning

confidence: 93%

“…Since then, seep-related barites have been found in other parts of the world's oceans, for example, the Alaska margin (Suess et al, 1998), the Gulf of Mexico (Castellini et al, 2006;Fu and Aharon, 1997;Fu et al, 1994;Joye et al, 2005;Roberts and Carney, 1997), the Peru Margin (Aquilina et al, 1997;Torres et al, 1996a), the Sea of Japan (Torres et al, 1996b), the Monterey Canyon (Naehr et al, 2000), the Sea of Okhotsk (Greinert et al, 2002), Blake Ridge (Snyder et al, 2007), and the Southern California Continental Borderland (Hein et al, 2007). Such barite deposits can be quite large.…”

Section: Introductionmentioning

confidence: 99%

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Geochemical characteristics of the barite deposits at cold seeps from the northern Gulf of Mexico continental slope

Dong

Roberts

2011

Earth and Planetary Science Letters

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Geochemical characteristics of the barite deposits at cold seeps from the northern Gulf of Mexico continental slope

Dong

Roberts

2011

Earth and Planetary Science Letters

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“…For some phases they use the same extractor, but with different pH values (Rutten and de Lange 2002). In addition, among the 12 steps proposed by these authors, three of are equal to those of Schenau et al (2001) (first method mentioned above); (d) Snyder et al (2007) proposed the use of aqua-regia, i.e. a mixture of concentrated HCl and HNO 3 acids dissolving barite at a rate of 1 mg mL -1 .…”

Section: Introductionmentioning

confidence: 99%

Barium and its Importance as an Indicator of (Paleo)Productivity

Liguori

Almeida

Rezende

2016

An. Acad. Bras. Ciênc.

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Barium (Ba) is a trace element which occurs predominantly as barite mineral (BaSO 4 ) in the marine environment. Previous work suggests that barite concentrations are related to the organic carbon flux and marine biological debris in the water column suggesting a direct or indirect involvement in the marine biological cycling. In addition, barite has a high preservation rate (~30%) in sediments and it is less affected by early diagenesis than other proxies for productivity such as carbonates (~10%) and organic carbon (~1%), for example. Therefore, Ba is considered an excellent proxy for ocean (paleo)productivity. However, correlating barite to productivity involves some caveats. Specifically, the post-depositional formation of barite in oxic sediments can lead to Ba release into porewaters under anoxic conditions, which can form barite again under oxic conditions. This diagenetic formation is not correlated to export production as the seawater authigenic barite formed with decaying organic matter in the water column. Therefore, the main goal of this work is to briefly review the marine Ba cycle and highlight its importance for (paleo)productivity research.

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“…Barium ions then diffuse upward into the sulfate zone, and reprecipitate as authigenic/diagenetic barite slightly above the SMT in so-called barite fronts (e.g., Torres et al 1996a;Dickens 2001b;Riedinger et al 2006). The size of these diagenetic barite peaks is dependent on the upward flux of Ba 2+ and the period of time the SMT is fixed at a particular sediment level (e.g., Dickens 2001b; Riedinger et al 2006;Snyder et al 2007a). …”

Section: Introductionmentioning

confidence: 99%

“…Barite has already been successfully applied as a proxy parameter to constrain changes in the upward flux of methane from the gas hydrate system on Blake Ridge (Dickens 2001b;Snyder et al 2007a), and from Cretaceous black shales in deposits of the Demerara Rise (Arndt et al 2009). Recently, Nöthen and Kasten (2011) used pore-water and solid-phase Sr/Ca and Mg/Ca ratios to infer the mineralogy of authigenic carbonates in the sediments of the so-called Kouilou pockmarks of the northern Congo Fan (Sahling et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Gas hydrate decomposition recorded by authigenic barite at pockmark sites of the northern Congo Fan

et al. 2012

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The geochemical cycling of barium was investigated in sediments of pockmarks of the northern Congo Fan, characterized by surface and subsurface gas hydrates, chemosynthetic fauna, and authigenic carbonates. Two gravity cores retrieved from the so-called Hydrate Hole and Worm Hole pockmarks were examined using high-resolution pore-water and solid-phase analyses. The results indicate that, although gas hydrates in the study area are stable with respect to pressure and temperature, they are and have been subject to dissolution due to methane-undersaturated pore waters. The process significantly driving dissolution is the anaerobic oxidation of methane (AOM) above the shallowest hydrate-bearing sediment layer. It is suggested that episodic seep events temporarily increase the upward flux of methane, and induce hydrate formation close to the sediment surface. AOM establishes at a sediment depth where the upward flux of methane from the uppermost hydrate layer counterbalances the downward flux of seawater sulfate. After seepage ceases, AOM continues to consume methane at the sulfate/methane transition (SMT) above the hydrates, thereby driving the progressive dissolution of the hydrates "from above". As a result the SMT migrates downward, leaving behind enrichments of authigenic barite and carbonates that typically precipitate at this biogeochemical reaction front. Calculation of the time needed to produce the observed solid-phase barium enrichments above the present-day depths of the SMT served to track the net downward migration of the SMT and to estimate the total time of hydrate dissolution in the recovered sediments. Methane fluxes were higher, and the SMT was located closer to the sediment surface in the past at both sites. Active seepage and hydrate formation are inferred to have occurred only a few thousands of years ago at the Hydrate Hole site. By contrast, AOM-driven hydrate dissolution as a consequence of an overall net decrease in upward methane flux seems to have persisted for a considerably longer time at the Worm Hole site, amounting to a few tens of thousands of years.

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Labile barite contents and dissolved barium concentrations on Blake Ridge: New perspectives on barium cycling above gas hydrate systems

Cited by 43 publications

References 38 publications

Geochemical characteristics of the barite deposits at cold seeps from the northern Gulf of Mexico continental slope

Geochemical characteristics of the barite deposits at cold seeps from the northern Gulf of Mexico continental slope

Barium and its Importance as an Indicator of (Paleo)Productivity

Gas hydrate decomposition recorded by authigenic barite at pockmark sites of the northern Congo Fan

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