Copper isotope fractionation during its interaction with soil and aquatic microorganisms and metal oxy(hydr)oxides: Possible structural control

Pokrovsky, Oleg S.; Viers, Jérôme; Emnova, E E; Kompantseva, E. I.; Freydier, Rémi

doi:10.1016/j.gca.2008.01.018

Cited by 186 publications

(123 citation statements)

References 98 publications

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“…Cu solution-phytoplankton ≈ 0) is consistently observed in the pH range of modern oceans, for both prokaryotes and eukaryotes (16,28). In our sample suite, δ…”

supporting

confidence: 59%

Cu isotopes in marine black shales record the Great Oxidation Event

Fru

Rodríguez

Partin

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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The oxygenation of the atmosphere ∼2.45–2.32 billion years ago (Ga) is one of the most significant geological events to have affected Earth’s redox history. Our understanding of the timing and processes surrounding this key transition is largely dependent on the development of redox-sensitive proxies, many of which remain unexplored. Here we report a shift from negative to positive copper isotopic compositions (δ65CuERM-AE633) in organic carbon-rich shales spanning the period 2.66–2.08 Ga. We suggest that, before 2.3 Ga, a muted oxidative supply of weathering-derived copper enriched in 65Cu, along with the preferential removal of 65Cu by iron oxides, left seawater and marine biomass depleted in 65Cu but enriched in 63Cu. As banded iron formation deposition waned and continentally sourced Cu became more important, biomass sampled a dissolved Cu reservoir that was progressively less fractionated relative to the continental pool. This evolution toward heavy δ65Cu values coincides with a shift to negative sedimentary δ56Fe values and increased marine sulfate after the Great Oxidation Event (GOE), and is traceable through Phanerozoic shales to modern marine settings, where marine dissolved and sedimentary δ65Cu values are universally positive. Our finding of an important shift in sedimentary Cu isotope compositions across the GOE provides new insights into the Precambrian marine cycling of this critical micronutrient, and demonstrates the proxy potential for sedimentary Cu isotope compositions in the study of biogeochemical cycles and oceanic redox balance in the past.

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“…Cu solution-phytoplankton ≈ 0) is consistently observed in the pH range of modern oceans, for both prokaryotes and eukaryotes (16,28). In our sample suite, δ…”

supporting

confidence: 59%

Cu isotopes in marine black shales record the Great Oxidation Event

Fru

Rodríguez

Partin

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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“…The discharge-weighted average of 0.68% of these rivers was used in our model. ( 26,28 , which indicate enrichment of the heavy Cu isotope onto oxide surfaces in NaNO 3 solutions or mixtures of acidic drainage and river water. The discrepancy may be caused by differences in conditions, such as pH, Cu concentration and organic ligand concentration, between experimental solutions and natural seawater.…”

Section: Resultsmentioning

confidence: 99%

Isotopic constraints on biogeochemical cycling of copper in the ocean

et al. 2014

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Trace elements and their isotopes are being actively studied as powerful tracers in the modern ocean and as proxies for the palaeocean. Although distributions and fractionations have been reported for stable isotopes of dissolved Fe, Cu, Zn and Cd in the ocean, the data remain limited and only preliminary explanations have been given. Copper is of great interest because it is either essential or toxic to organisms and because its distribution reflects both biological recycling and scavenging. Here we present new isotopic composition data for dissolved Cu (d 65 Cu) in seawater and rainwater. The Cu isotopic composition in surface seawater can be explained by the mixing of rain, river and deep seawater. In deep seawater, d 65 Cu becomes heavier with oceanic circulation because of preferential scavenging of the lighter isotope ( 63 Cu). In addition, we constrain the marine biogeochemical cycling of Cu using a new box model based on Cu concentrations and d 65 Cu.

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“…Low-temperature processes are the major source of Cu isotope variations; the main processes are: (i) variation of redox conditions, (ii) adsorption on mineral surfaces and organic matter (Pokrovsky et al 2008;Balistrieri et al 2008), (iii) inorganic and organic complexation to ligands (Pokrovsky et al 2008), (iv) biological fractionation by plants and micro-organisms (Weinstein et al 2011).…”

Section: Low-temperature Fractionationsmentioning

confidence: 99%

Isotope Fractionation Processes of Selected Elements

Hoefs

2015

Stable Isotope Geochemistry

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Copper isotope fractionation during its interaction with soil and aquatic microorganisms and metal oxy(hydr)oxides: Possible structural control

Cited by 186 publications

References 98 publications

Cu isotopes in marine black shales record the Great Oxidation Event

Cu isotopes in marine black shales record the Great Oxidation Event

Isotopic constraints on biogeochemical cycling of copper in the ocean

Isotope Fractionation Processes of Selected Elements

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