88Sr/86Sr fractionation in inorganic aragonite and in corals

Noa Fruchter, Anton Eisenhauer, Martin Dietzel, Jan Fietzke, Florian Böhm, Paolo Montagna, Moti Stein, Boaz Lazar, Riccardo Rodolfo-Metalpa, Jonathan Erez

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Conflicting results have been reported for the stable Sr isotope fractionation, specifically with respect to the influence of temperature. In an experimental study we have investigated the stable Sr isotope systematics for inorganically precipitated and biogenic (coral) aragonite (natural and laboratory-cultured). Inorganic aragonite precipitation experiments were performed from natural seawater using the CO2 diffusion technique. The experiments were performed at different temperatures and different carbonate ion concentrations. 88Sr/86Sr of the inorganic aragonite precipitated in the experiments are 0.2‰ lighter than seawater, but showed no correlation to the water temperature or to CO32- concentration. Similar observations are made in different coral species (Cladocora caespitosa, Porites sp. and Acropora sp.), with identical fractionation from the bulk solution and no correlation to temperature or CO32- concentration. The lack of 88Sr/86Sr variability in corals at different environmental parameters and the similarity to the 88Sr/86Sr fractionation in inorganic aragonite may indicate a similar Sr incorporation mechanism in corals skeleton and inorganic aragonite, and therefore the previously proposed Rayleigh-based multi element model (Gaetani et al., 2011) cannot explain the process of Sr incorporation in the coral skeletal material. It is proposed that the relatively constant 88Sr/86Sr fractionation in aragonite can be used for paleo reconstruction of seawater 88Sr/86Sr composition. The seawater 88Sr/86Sr ratio reconstruction can be further used in calcite samples to reconstruct paleo precipitation rates.

Original languageEnglish
Pages (from-to)268-280
Number of pages13
JournalGeochimica et Cosmochimica Acta
Volume178
DOIs
Publication statusPublished - 1 Apr 2016

Fingerprint

Calcium Carbonate
aragonite
Fractionation
coral
fractionation
Seawater
seawater
Isotopes
stable isotope
experiment
temperature
Temperature
Experiments
Carbonates
skeleton
water temperature
calcite
experimental study
carbonate
Ions

ASJC Scopus subject areas

  • Geochemistry and Petrology

Fields of Expertise

  • Advanced Materials Science

Cite this

Fruchter, N., Eisenhauer, A., Dietzel, M., Fietzke, J., Böhm, F., Montagna, P., ... Erez, J. (2016). 88Sr/86Sr fractionation in inorganic aragonite and in corals. Geochimica et Cosmochimica Acta, 178, 268-280. https://doi.org/10.1016/j.gca.2016.01.039

88Sr/86Sr fractionation in inorganic aragonite and in corals. / Fruchter, Noa; Eisenhauer, Anton; Dietzel, Martin; Fietzke, Jan; Böhm, Florian; Montagna, Paolo; Stein, Moti; Lazar, Boaz; Rodolfo-Metalpa, Riccardo; Erez, Jonathan.

In: Geochimica et Cosmochimica Acta, Vol. 178, 01.04.2016, p. 268-280.

Research output: Contribution to journalArticleResearchpeer-review

Fruchter, N, Eisenhauer, A, Dietzel, M, Fietzke, J, Böhm, F, Montagna, P, Stein, M, Lazar, B, Rodolfo-Metalpa, R & Erez, J 2016, '88Sr/86Sr fractionation in inorganic aragonite and in corals' Geochimica et Cosmochimica Acta, vol. 178, pp. 268-280. https://doi.org/10.1016/j.gca.2016.01.039
Fruchter, Noa ; Eisenhauer, Anton ; Dietzel, Martin ; Fietzke, Jan ; Böhm, Florian ; Montagna, Paolo ; Stein, Moti ; Lazar, Boaz ; Rodolfo-Metalpa, Riccardo ; Erez, Jonathan. / 88Sr/86Sr fractionation in inorganic aragonite and in corals. In: Geochimica et Cosmochimica Acta. 2016 ; Vol. 178. pp. 268-280.
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