On the marine geochemistry of barium

Chow, Tsaihwa J.; Goldberg, Edward D.

doi:10.1016/0016-7037(60)90073-9

Cited by 237 publications

(115 citation statements)

References 6 publications

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“…is consistent with observations reported in previous studies and the postulate that barite precipitation takes place in the upper 500 m of the water column (Chow and Goldberg, 1960;Dehairs et al, 1980;Bishop, 1988;Dehairs et al, 1990Dehairs et al, , 1991Dehairs et al, , 1992Legeleux and Reyss, 1996). The presence of barite among the suspended particles collected in the framework of the BARMED program was confirmed using Scanning Electron Microprobe (Fig.…”

Section: Ra Ex and Ba Ex Distributions In Suspended Particles And Opesupporting

confidence: 92%

“…Since the world's oceans were found to be mostly undersaturated with respect to barite (Church and Wolgemuth, 1972; see also Monnin et al, 1999;Rushdi et al, 2001;Monnin and Cividini, 2006), it was proposed that barite precipitation takes place in the upper water column within supersaturated microenvironments (Chow and Goldberg, 1960). Such microenvironments could result from the decay of organic matter exported from the euphotic layer (Dehairs et al, 1980;Bishop, 1988;Stroobants et al, 1991;Dehairs et al, 1990;Dehairs et al, 1991;Dehairs et al, 1992;Ganeshram et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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228Ra/226Ra and 226Ra/Ba ratios in the Western Mediterranean Sea: Barite formation and transport in the water column

Beek

Sternberg²,

Reyss³

et al. 2009

Geochimica et Cosmochimica Acta

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Section: Ra Ex and Ba Ex Distributions In Suspended Particles And Opesupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

228Ra/226Ra and 226Ra/Ba ratios in the Western Mediterranean Sea: Barite formation and transport in the water column

Beek

Sternberg²,

Reyss³

et al. 2009

Geochimica et Cosmochimica Acta

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“…Chow and Goldberg, 1960), despite lacking a definitive physiological use in phytoplankton. Distributions of dissolved Ba are strongly linearly correlated with those of Si (silicon) throughout much of the global ocean (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…The loci of maximum pelagic BaSO 4 -and heterotrophic bacterial production are spatially correlated (e.g. Dehairs et al, 2008), suggesting that the development of BaSO 4 -forming microenvironments are associated with the microbial oxidation of sinking organic matter (e.g Chow and Goldberg, 1960). Regeneration of dissolved Ba at deeper depths likely relates to BaSO 4 dissolution in under-saturated seawater, thus closing the open oceans internal Ba cycle and illustrating a remarkable set of linkages between the microbial loop, pelagic BaSO 4 formation, and the cycling and export of BaSO 4 and organic carbon.…”

Section: Introductionmentioning

confidence: 99%

Barium-isotopic fractionation in seawater mediated by barite cycling and oceanic circulation

Horner

Kinsley

Nielsen

2015

Earth and Planetary Science Letters

140

247

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Highlights• First full seawater depth profile of co-located [Ba]-δ 138/134 Ba NIST• Origin of Ba-isotopic variations are best explained by barite cycling• Regional circulation strongly influences depth structure of δ 138/134 Ba NIST• Data establish a baseline of Ba-isotopic variability in the marine realm Keywords: barium; isotopic fractionation; barite; seawater; biogeochemistry AbstractThe marine biogeochemical cycle of Ba is thought to be controlled by particulate BaSO 4 (barite) precipitation associated with the microbial oxidation of organic carbon and its subsequent dissolution in the BaSO 4 -undersaturated water column. Despite many of these processes being largely unique to Ba cycling, concentrations of Ba and Si in seawater exhibit a strong linear correlation. The reasons for this correlation are ambiguous, as are the depth ranges corresponding to the most active BaSO 4 cycling and the intermediate sources of Ba to particulate BaSO 4 . Stable isotopic analyses of dissolved Ba in seawater should help address these issues, as Ba-isotopic compositions are predicted to be sensitive to the physical and biogeochemical process that cycle Ba. We report a new methodology for the determination of dissolved Ba-isotopic compositions in seawater and results from a 4, 500 m depth profile in the South Atlantic at 39.99 • S, 0.92 • E that exhibit oceanographically-consistent variation with depth. These data reveal that water masses obtain their [Ba] and Ba-isotopic signatures when at or near the surface, which relates to the cycling of marine BaSO 4 . The shallow origin of these signatures requires that the substantial Ba-isotopic variations in the bathypelagic zone were inherited from when those deep waters were last ventilated. Indeed, the water column below 600 m is well explained by conservative mixing of water masses with distinct [Ba] and Ba-isotopic compositions. This leads us to conclude that large scale oceanic circulation is important for sustaining the similar oceanographic distributions of Ba and Si in the South Atlantic, and possibly elsewhere. These data demonstrate that the processes of organic carbon oxidation, BaSO 4 cycling, and Ba-isotopic fractionation in seawater are closely coupled, such that Ba-isotopic analyses harbor great potential as a tracer of the carbon cycle in the modern and paleo-oceans.

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“…In the water column, Ba can occur in two forms: dissolved and particulate (Chow and Goldberg 1960). In rivers, it is mainly associated with suspended particulate matter (SPM) and tends to migrate in drainage basins associated with this matrix (Coffey et al 1997).…”

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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On the marine geochemistry of barium

Cited by 237 publications

References 6 publications

228Ra/226Ra and 226Ra/Ba ratios in the Western Mediterranean Sea: Barite formation and transport in the water column

228Ra/226Ra and 226Ra/Ba ratios in the Western Mediterranean Sea: Barite formation and transport in the water column

Barium-isotopic fractionation in seawater mediated by barite cycling and oceanic circulation

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

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