Molybdenum in marine deposits

Bertine, K.K.; Turekian, Karl K.

doi:10.1016/0016-7037(73)90080-x

Cited by 217 publications

(97 citation statements)

References 21 publications

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“…Such removal would have limited the Mo concentration in mid-Proterozoic seawater (82). Sulfidic waters cover only ϳ0.3% of the sea floor today, localized in areas of restricted circulation and high productivity, but may account for as much as ϳ40% of Mo removal (77,79). We infer that Mo surface concentrations in the late Paleoproterozoic and early Mesoproterozoic oceans were less than 10% of present levels if sulfidic conditions covered Ͼ10% of the sea floor (83).…”

Section: Trace Metals and The Nitrogen Cyclementioning

confidence: 99%

Proterozoic Ocean Chemistry and Evolution: A Bioinorganic Bridge?

Anbar

Knoll

2002

Science

1,061

733

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Recent data imply that for much of the Proterozoic Eon (2500 to 543 million years ago), Earth's oceans were moderately oxic at the surface and sulfidic at depth. Under these conditions, biologically important trace metals would have been scarce in most marine environments, potentially restricting the nitrogen cycle, affecting primary productivity, and limiting the ecological distribution of eukaryotic algae. Oceanic redox conditions and their bioinorganic consequences may thus help to explain observed patterns of Proterozoic evolution.

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Section: Trace Metals and The Nitrogen Cyclementioning

confidence: 99%

Proterozoic Ocean Chemistry and Evolution: A Bioinorganic Bridge?

Anbar

Knoll

2002

Science

1,061

733

View full text Add to dashboard Cite

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“…In the modern oxygenated ocean, Mo is the most abundant transition metal (∼105 nM) (Collier, 1985;Lyons et al, 2009) and exists primarily as molybdate (MoO 4 2− ), with a residence time of ∼0.8 Myr (Emerson and Huested, 1991;Morford and Emerson, 1999). The major source of Mo to the ocean is oxidative weathering of crustal sulfides and black shales (Bertine and Turekian, 1973). The largest modern oceanic sink for Mo is co-precipitation and adsorption with Mn-oxyhydroxides in oxic environments (Barling et al, 2001;McManus et al, 2006;Siebert et al, 2003).…”

Section: Molybdenum Geochemistrymentioning

confidence: 99%

Marine redox variations and nitrogen cycle of the early Cambrian southern margin of the Yangtze Platform, South China: Evidence from nitrogen and organic carbon isotopes

Wang

Struck

Guo

et al. 2015

Precambrian Research

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“…Sediment trap data and comparisons between pore water and solid phase data suggest an additional input of particulate non-lithogenic U that forms in the water column and is delivered to sediments; this fraction is labile under oxic conditions, but preserved in sedimentary solids when bottom water O 2 concentrations are <25 µM (Anderson, 1982;Zheng et al, 2002b). Several studies have documented a relationship between Mo and Mn oxides (Bertine and Turekian, 1973;Manheim, 1974;Colodner, 1991;Kato et al, 1995;Crusius et al, 1996;Morford and Emerson, 1999;Breckel et al, 2005), and U has been associated with Fe oxides (McKee et al, 1987;Barnes and Cochran, 1993;Church et al, 1996;Duff et al, 2002 precipitate from solution, they remove other elements through co-precipitation and/or adsorption. Both the oxides and the associated trace elements can be recycled many times before being lost to the water column or buried.…”

Section: Rsm: Diagenesismentioning

confidence: 99%

Insights on geochemical cycling of U, Re and Mo from seasonal sampling in Boston Harbor, Massachusetts, USA

Morford

Martin

Kalnejais

et al. 2007

Geochimica et Cosmochimica Acta

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3Benthic chamber experiments including the nonreactive solute tracer, Br -, indicated that sediment irrigation was very important to solute exchange at the study site.The enhancement of sediment-seawater exchange due to irrigation was determined for the nonreactive tracer (Br -), TCO 2 , NH 4 + , U and Mo. The comparisons between these solutes showed that reactions within and around the burrows were very important for modulating the Mo flux, but less important for U. The effect of these reactions on Mo exchange was highly variable, enhancing Mo (and, to a lesser extent, U) uptake at times of relatively modest irrigation, but inhibiting exchange when irrigation rates were faster.These results reinforce the observation that Mo can be released to and removed from pore waters via sedimentary reactions.The removal rate of U and Mo from seawater by sedimentary reactions was found to agree with the rate of accumulation of authigenic U and Mo in the solid phase. The fluxes of U and Mo determined by in situ benthic flux chamber measurements were the largest that have been measured to date. These results confirm that removal of redoxsensitive metals from continental margin sediments underlying oxic bottom water is important, and suggest that continental margin sediments play a key role in the marine budgets of these metals.4

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Molybdenum in marine deposits

Cited by 217 publications

References 21 publications

Proterozoic Ocean Chemistry and Evolution: A Bioinorganic Bridge?

Proterozoic Ocean Chemistry and Evolution: A Bioinorganic Bridge?

Marine redox variations and nitrogen cycle of the early Cambrian southern margin of the Yangtze Platform, South China: Evidence from nitrogen and organic carbon isotopes

Insights on geochemical cycling of U, Re and Mo from seasonal sampling in Boston Harbor, Massachusetts, USA

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