The chromium isotopic composition of seawater and marine carbonates

Bonnand, Pierre; James, Rachael H.; Parkinson, I. J.; Connelly, Douglas P.; Fairchild, Ian J.

doi:10.1016/j.epsl.2013.09.001

Cited by 150 publications

(172 citation statements)

References 72 publications

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“…However, Wang et al (2016) also found that foraminifera species with similar depth habitats from the same core-top sample also yielded different δ 53 Cr values. Species-dependent δ 53 Cr variations are furthermore complicated by the observation that species with shallower water depth habitats yielded consistently lower δ 53 Cr than species preferring deeper water environments, which is opposite to the general patterns expected in seawater δ 53 Cr (Bonnand et al, 2013;Scheiderich et al, 2015). These observations hint at the possibility that species-dependent biological (metabolic) processes may play a major role in controlling Cr isotope fractionation during biomineralization/calcification processes of marine biogenic carbonate producers in general, not only in foraminiferal calcification.…”

Section: Inter-and Intra-species Shell Variationsmentioning

confidence: 76%

“…Wang et al (2016) also found that foraminifera species with similar depth habitats from the same core-top sample also yielded different δ 53 Cr values. In addition, within samples, foraminifera with shallower habitats yielded consistently lower δ 53 Cr than those with deeper habitats, which these authors correctly described as opposite to the general patterns expected in seawater δ 53 Cr (Bonnand et al, 2013;Scheiderich et al, 2015;Paulukat et al, 2016). The study of Farkaš et al (2018) Wang et al (2016) could be envisaged as to result from variable Cr uptake mechanisms.…”

Section: Shells -Chromium Isotope Compositions and Chromium Concentramentioning

confidence: 86%

“…Much research focus today is on the understanding of the redox cycling of Cr in the ocean system, and on investigating marine sediments and marine organisms as potential archives for recording past redox conditions of the ocean-atmosphere system through geological time (Frei et al, 2009Bonnand et al, 2013;Planavsky et al, 2014;Holmden et al, 2016;D'Arcy et al, 2017;Rodler et al, 2016a, b;Gilleaudeau et al, 2016). It is conceivable that the Cr isotope composition of seawater and marine chemical sediments reflect a complex signal of oxidation/reduction processes operating within the oceans (Scheiderich et al, 2015;Paulukat et al, 2016), and it is therefore clear that one must first understand the individual processes and mechanisms that govern the transfer of dissolved Cr in seawater into the respective potential archives.…”

Section: Introductionmentioning

confidence: 99%

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A systematic look at chromium isotopes in modern shells – implications for paleo-environmental reconstructions

2018

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Abstract. The chromium isotope system ( 53 Cr / 52 Cr, expressed as δ 53 Cr relative to NIST SRM 979) in marine biogenic and non-biogenic carbonates is currently being evaluated as a proxy for the redox state of the ocean. Previous work has concentrated on using corals and foraminifera for this purpose, but investigations focusing on the behavior of Cr in bivalves as potential archives are lacking. Due to their often good preservation, fossil marine biogenic carbonates have the potential to serve as useful archives for the reconstruction of past ocean redox fluctuations and eventually link those to climatic changes throughout Earth's history. Here, we present an evaluation of the Cr isotope system in shells of some modern bivalves. Shell species from Lucidinadae, Cardiidae, Glycimerididae and Pectenidae, collected systematically from one Mediterranean location (Playa Poniente, Benidorm, Spain) over a 3-year period reveal δ 53 Cr values ranging from 0.15 ‰ to 0.65 ‰, values that are systematically below the local seawater δ 53 Cr value of 0.83 ± 0.05 ‰. This attests to a significant reduction of dissolved seawater chromium in the process leading to calcification and thus for control of Cr isotope fractionation during biological routes. A similar, constant offset in δ 53 Cr values relative to surface seawater is observed in shells from Mytilius edulis from an arctic location (Godhavn, Disko Bay, Greenland). Chromium concentrations in the studied shells are significantly controlled by organic matter and typically range from 0.020 to 0.100 ppm, with some higher concentrations of up to 0.163 ppm recorded in Pectenidae. We also observe subtle, species-dependent differences in average Cr isotope signatures in the samples from Playa Poniente, particularly of Lucidinadae and Cardiidae, with considerably depressed and elevated δ 53 Cr values, respectively, relative to the other species investigated. Intra-species heterogeneities, both in Cr concentrations and δ 53 Cr values, are favorably seen to result from vital effects during shell calcification rather than from heterogeneous seawater composition. This is because we observe that the surface seawater composition in the particular Playa Poniente location remained constant during the month of July of the 3 years we collected bivalve samples. Intra-shell heterogeneities -associated with growth zones reflecting one to several years of growth, both in δ 53 Cr and Cr concentrations -are observed in a sample of Placuna placenta and Mimachlamys townsendi. We suspect that these variations are, at least partially, related to seasonal changes in δ 53 Cr of surface seawaters. Recognizing the importance of organic substances in the bivalve shells, we propose a model whereby reduction of Cr(VI) originally contained in the seawater as chromate ion and transported to the calcifying space, to Cr(III), is effectively adsorbed onto organic macromolecules which eventually get included in the growing shell carbonates. This study, with its definition of statistically sound offsets in δ 53 Cr...

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Section: Inter-and Intra-species Shell Variationsmentioning

confidence: 76%

Section: Shells -Chromium Isotope Compositions and Chromium Concentramentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

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A systematic look at chromium isotopes in modern shells – implications for paleo-environmental reconstructions

2018

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“…The isotopically heavy, mobilized Cr(VI) is then transported by rivers (Farkaš et al, 2013;Frei et al, 2014;Paulukat et al, 2015) possibly affected by signals derived from regional variable Cr isotopic compositions of geologically different drainage systems (Scheiderich et al, 2015) -to the open ocean, where oxygenated water bodies stabilize it. This is perhaps indicated by a comparison of the surface seawater δ 53 Cr signature of the Argentinian Basin (Bonnand et al, 2013), and water samples of the Paraná River estuary and of the Paraná river . Results of these studies allow postulating that isotope effects during riverine transport of Cr to the oceans are not significant, and that the point sources of Cr have a dominant effect on the local Cr isotope signal recorded in seawater.…”

Section: Introductionmentioning

confidence: 99%

Chromium isotope stratigraphy of Ediacaran cap dolostones, Doushantuo Formation, South China

2016

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The Yangtze Platform in South China is considered a key site for studying Neoproterozoic ocean oxygenation. Comprehensive Cr concentration and isotopic signatures are presented from cap dolostones of the Doushantuo Formation from a deep water and a shallow marine carbonate section, that have previously been used to constrain the redox evolution of Ediacaran seawater in space and time employing major and trace element abundances as well as Sr-, O-and C-isotope compositions. The majority of the studied samples yield elevated Cr concentrations and negatively fractionated δ Sr signal close to Ediacaran seawater values with relatively high Sr and Cr concentrations, with decreased detrital contamination and with a pronounced negative Ce anomaly. They indicate either light pulses of enhanced oxidative weathering or, inferred from a few leastaltered samples, prevailing oxic conditions during cap dolostone deposition. The Cr isotopic composition of Ediacaran cap dolostones pertaining to the Doushantuo Formation reveals fine-scale fluctuations in postglacial detrital contamination and diagenesis balanced against a clear signal of oxidative weathering. Cr isotopes have the potential to further enhance our understanding of Neoproterozoic weathering regimes and past ocean oxygenation, however, before the Cr isotope system can be faithfully applied to delineate changes in redox conditions recorded in ancient marine carbonates, possible diagenetic alteration of the Cr signal as well as Cr contribution from detrital contamination need to be taken into consideration.

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“…Chromium stable isotopes in Fe-rich chemical sediments deposited during glacial events are suitable for tracing oxygenation of surface environments through Earth's history. Besides, Cr isotopes in carbonates may be useful as a tracer for climate change and for reconstructing the redox state of ancient seawater (Frei et al 2011;Bonnand et al 2013).…”

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confidence: 99%

Correlations of some Neoproterozoic carbonate-dominated successions in South America based on high-resolution chemostratigraphy

Sial

Gaucher²,

Misi

et al. 2016

Braz. J. Geol.

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This report reviews and incorporates new elemental and isotope chemostratigraphic data for correlation of Neoproterozoic carbonate-dominated successions in South America (Argentina, Bolivia, Brazil, Paraguay and Uruguay). These thick mixed carbonate/siliciclastic successions were largely deposited in epicontinental basins or accumulated on passive margins on the edges of cratons (e.g. São Francisco, Amazonia, Rio Apa Block, Pampia and Río de la Plata paleocontinents) during extensional events related to the rifting of the Rodinia Supercontinent. From the stratigraphic point of view, these successions occur as three mega-sequences: glaciogenic, marine carbonate platform (above glaciomarine diamictites or rift successions), and dominantly continental to transitional siliciclastics. In the orogenic belts surrounding cratons, carbonate-dominated successions with important volcanoclastic/siliciclastic contribution have been, in most cases, strongly deformed. The precise ages of these successions remain a matter of debate, but recently new paleontological and geochronological data have considerably constrained depositional intervals. Here, we report high-resolution C, O, Sr, and S isotope trends measured in well-preserved sample sets and mainly use Sr and C isotopes RESUMO: Esta revisão incorpora novos dados isotópicos e quími-cos para correlação quimioestratigráfica de sucessões

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The chromium isotopic composition of seawater and marine carbonates

Cited by 150 publications

References 72 publications

A systematic look at chromium isotopes in modern shells – implications for paleo-environmental reconstructions

A systematic look at chromium isotopes in modern shells – implications for paleo-environmental reconstructions

Chromium isotope stratigraphy of Ediacaran cap dolostones, Doushantuo Formation, South China

Correlations of some Neoproterozoic carbonate-dominated successions in South America based on high-resolution chemostratigraphy

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