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Jianwu Tang1, Andrea Niedermayr, Stephan J Köhler

  • 1Institute of Applied Geosciences, Graz University of Technology, Rechbauerstrasse 12, A-8010 Graz, Austria.

Geochimica Et Cosmochimica Acta
|February 21, 2012
PubMed
Summary

Strontium/calcium ratios and calcium isotope fractionation in calcite are key paleo-environmental proxies. Precipitation rate, not salinity, primarily controls Sr/Ca and Ca isotope variations in calcite.

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Area of Science:

  • Geochemistry
  • Paleoclimatology
  • Isotope Geochemistry

Background:

  • Reconstructing past environmental conditions relies on proxies like Sr/Ca and Ca isotopes in calcium carbonate (CaCO(3)).
  • Understanding the influence of environmental factors on these proxies is crucial for accurate paleo-environmental reconstructions.

Purpose of the Study:

  • To investigate the impact of ionic strength/salinity on Sr/Ca and (44)Ca/(40)Ca fractionation during inorganic calcite precipitation.
  • To evaluate the combined utility of Sr/Ca and Ca isotope data as multi-proxies for paleo-environmental reconstruction.

Main Methods:

  • Inorganic calcite was crystallized from aqueous solutions using a CO(2) diffusion technique at 25°C.
  • Experiments were conducted across varying ionic strengths/salinities achieved by adding NaCl.
  • Sr/Ca ratios and (44)Ca/(40)Ca isotope fractionation (Δ(44/40)Ca(calcite-aq)) were measured in relation to precipitation rate (R).

Main Results:

  • Sr(2+) vs. Ca(2+) discrimination in calcite is primarily controlled by precipitation rate (R), with minor influence from ionic strength.
  • (44)Ca/(40)Ca fractionation is also weakly affected by ionic strength and shows an inverse correlation with log R.
  • An inverse relationship between Δ(44/40)Ca(calcite-aq) and log D(Sr) was observed, independent of temperature, rate, and aqueous Sr/Ca.

Conclusions:

  • Precipitation rate is the dominant factor controlling Sr/Ca and Ca isotope fractionation in inorganic calcite.
  • Ionic strength/salinity has a limited effect on these proxies under the studied conditions.
  • Combined Sr/Ca and δ(44/40)Ca(calcite) values offer a robust multi-proxy approach for reconstructing calcite growth conditions and diagenetic alterations.

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