Post-depositional overprinting of chromium in foraminifera

Serginio R.C. Remmelzwaal, Aleksey Yu Sadekov, Ian J. Parkinson, Daniela N. Schmidt, Danna Titelboim, Sigal Abramovich, Anne Roepert, Michiel Kienhuis, Lubos Polerecky, Heather Goring-Harford, Katsunori Kimoto, Katherine A. Allen, Kate Holland, Joseph A. Stewart, Jack J. Middelburg

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Abstract

Present-day ocean deoxygenation has major implications for marine ecosystems and biogeochemical cycling in the oceans. Chromium isotopes are used as a proxy to infer changes in past oceanic redox state. Chromium isotopes in carbonates, including the prime proxy carrier foraminifera, were initially thought to record the seawater composition during crystallisation. However, the uptake of Cr into foraminiferal tests and carbonates is still poorly understood and recent studies question this assumption. We assess whether Cr in foraminiferal calcite is taken up during biomineralisation, has a post-depositional origin or is a combination of the two. Laser Ablation-MC-ICP-MS analyses and NanoSIMS imaging of individual tests were used to characterise the distribution of Cr in both planktic and benthic foraminifera. Foraminifera in sediment core-top samples have up to two orders of magnitude more Cr than sediment trap, plankton net, and culture samples. In cultured specimens, Cr is incorporated in foraminiferal tests at low concentrations (0.04–0.13 ppm) with a distribution coefficient of ∼250 ± 43 (2SE) which is an upper estimate due to substantial loss of dissolved Cr during the experiment. Part of the Cr signal in sedimentary foraminifera may be primary, but this primary signal is likely often overprinted by the uptake of Cr from bottom and pore waters. In sediment samples, there is no significant isotopic offset between individual species and bulk foraminiferal calcite from the same size fraction. The >500 μm fraction has a heavier isotopic composition than the smaller 250–500 μm fraction with an offset of −0.3 to −0.5‰ due to an increase in surface area to volume. We propose that Cr in foraminifera is predominantly post-depositional and records bottom/pore water signals. This is contrary to current interpretations of the foraminiferal Cr isotope proxy as a surface seawater redox proxy.

Original languageEnglish
Pages (from-to)100-111
Number of pages12
JournalEarth and Planetary Science Letters
Volume515
DOIs
Publication statusPublished - 1 Jun 2019

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Chromium Isotopes
Calcium Carbonate
overprinting
chromium isotopes
Carbonates
Chromium
Seawater
foraminifera
chromium
Sediments
sediments
Sediment traps
calcite
Biomineralization
Plankton
Aquatic ecosystems
Water
carbonates
oceans
isotope

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Remmelzwaal, S. R. C., Sadekov, A. Y., Parkinson, I. J., Schmidt, D. N., Titelboim, D., Abramovich, S., ... Middelburg, J. J. (2019). Post-depositional overprinting of chromium in foraminifera. Earth and Planetary Science Letters, 515, 100-111. https://doi.org/10.1016/j.epsl.2019.03.001
Remmelzwaal, Serginio R.C. ; Sadekov, Aleksey Yu ; Parkinson, Ian J. ; Schmidt, Daniela N. ; Titelboim, Danna ; Abramovich, Sigal ; Roepert, Anne ; Kienhuis, Michiel ; Polerecky, Lubos ; Goring-Harford, Heather ; Kimoto, Katsunori ; Allen, Katherine A. ; Holland, Kate ; Stewart, Joseph A. ; Middelburg, Jack J. / Post-depositional overprinting of chromium in foraminifera. In: Earth and Planetary Science Letters. 2019 ; Vol. 515. pp. 100-111.
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Remmelzwaal, SRC, Sadekov, AY, Parkinson, IJ, Schmidt, DN, Titelboim, D, Abramovich, S, Roepert, A, Kienhuis, M, Polerecky, L, Goring-Harford, H, Kimoto, K, Allen, KA, Holland, K, Stewart, JA & Middelburg, JJ 2019, 'Post-depositional overprinting of chromium in foraminifera' Earth and Planetary Science Letters, vol. 515, pp. 100-111. https://doi.org/10.1016/j.epsl.2019.03.001

Post-depositional overprinting of chromium in foraminifera. / Remmelzwaal, Serginio R.C.; Sadekov, Aleksey Yu; Parkinson, Ian J.; Schmidt, Daniela N.; Titelboim, Danna; Abramovich, Sigal; Roepert, Anne; Kienhuis, Michiel; Polerecky, Lubos; Goring-Harford, Heather; Kimoto, Katsunori; Allen, Katherine A.; Holland, Kate; Stewart, Joseph A.; Middelburg, Jack J.

In: Earth and Planetary Science Letters, Vol. 515, 01.06.2019, p. 100-111.

Research output: Contribution to journalArticle

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T1 - Post-depositional overprinting of chromium in foraminifera

AU - Remmelzwaal, Serginio R.C.

AU - Sadekov, Aleksey Yu

AU - Parkinson, Ian J.

AU - Schmidt, Daniela N.

AU - Titelboim, Danna

AU - Abramovich, Sigal

AU - Roepert, Anne

AU - Kienhuis, Michiel

AU - Polerecky, Lubos

AU - Goring-Harford, Heather

AU - Kimoto, Katsunori

AU - Allen, Katherine A.

AU - Holland, Kate

AU - Stewart, Joseph A.

AU - Middelburg, Jack J.

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N2 - Present-day ocean deoxygenation has major implications for marine ecosystems and biogeochemical cycling in the oceans. Chromium isotopes are used as a proxy to infer changes in past oceanic redox state. Chromium isotopes in carbonates, including the prime proxy carrier foraminifera, were initially thought to record the seawater composition during crystallisation. However, the uptake of Cr into foraminiferal tests and carbonates is still poorly understood and recent studies question this assumption. We assess whether Cr in foraminiferal calcite is taken up during biomineralisation, has a post-depositional origin or is a combination of the two. Laser Ablation-MC-ICP-MS analyses and NanoSIMS imaging of individual tests were used to characterise the distribution of Cr in both planktic and benthic foraminifera. Foraminifera in sediment core-top samples have up to two orders of magnitude more Cr than sediment trap, plankton net, and culture samples. In cultured specimens, Cr is incorporated in foraminiferal tests at low concentrations (0.04–0.13 ppm) with a distribution coefficient of ∼250 ± 43 (2SE) which is an upper estimate due to substantial loss of dissolved Cr during the experiment. Part of the Cr signal in sedimentary foraminifera may be primary, but this primary signal is likely often overprinted by the uptake of Cr from bottom and pore waters. In sediment samples, there is no significant isotopic offset between individual species and bulk foraminiferal calcite from the same size fraction. The >500 μm fraction has a heavier isotopic composition than the smaller 250–500 μm fraction with an offset of −0.3 to −0.5‰ due to an increase in surface area to volume. We propose that Cr in foraminifera is predominantly post-depositional and records bottom/pore water signals. This is contrary to current interpretations of the foraminiferal Cr isotope proxy as a surface seawater redox proxy.

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KW - chromium

KW - diagenesis

KW - distribution coefficient

KW - foraminifera

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Remmelzwaal SRC, Sadekov AY, Parkinson IJ, Schmidt DN, Titelboim D, Abramovich S et al. Post-depositional overprinting of chromium in foraminifera. Earth and Planetary Science Letters. 2019 Jun 1;515:100-111. https://doi.org/10.1016/j.epsl.2019.03.001