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Fietzke & Eisenhauer 2006
Fietzke, J. and Eisenhauer, A. (2006). Determination of temperature-dependent stable strontium isotope (88Sr/86Sr) fractionation via bracketing standard MC-ICP-MS. Geochemistry Geophysics Geosystems 7: doi: 10.1029/2006GC001243. issn: 1525-2027.

Stable strontium isotopes (here 88Sr/86Sr) are introduced as a new member of the nontraditional stable isotopes. We have developed a bracketing standard method for the determination of δ88/86Sr using an AXIOM MC-ICP-MS and normalizing to strontium SRM NBS987. For individual measurements the external reproducibility is better than about 25 ppm (1σ RSD). For the IAPSO seawater standard a δ88/86Sr value of 0. 381 ¿ 0.010? (2SEM) was determined. For the first time a temperature-dependent strontium isotope fractionation during calcium carbonate precipitation could be shown. Aragonite samples inorganically precipitated under temperature control between 10 and 50¿C revealed a δ88/86Sr/temperature dependency of 0.0054(5)?/¿C (R2 = 0.987). In contrast, for natural coral samples (Pavona clavus) from a proxy calibration study (23 to 27¿C) we did determine 0.033(5)?/¿C (R2 = 0.955). The processes causing this sixfold stronger temperature dependency for the natural coral samples have to be studied in more detail in future studies. In a first approach the different slopes can be interpreted as effects of kinetic fractionation of strontium ions with or without a hydrate shell of 22 to 29 water molecules.

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Abstract

Keywords
Biogeosciences, Biomineralization, Biogeosciences, Instruments and techniques, Geochemistry, Stable isotope geochemistry (0454, 4870)
Journal
Geochemistry Geophysics Geosystems
Publisher
American Geophysical Union
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