Strontium behavior in the aragonite-calcite transformation: An experimental study at 40-98°C

Details Strontium behavior in the aragonite-calcite transformation: An experimental study at 40-98°C Strontium behavior in the aragonite-calcite transformation: An experimental study at 40-98°C

Apr 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36..481k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 36, Issue 4, pp.481-496

Physics

29

Scientific paper

The behavior of strontium during the replacement of aragonite by calcite, in a closed system between 40°C and 98°C, has been experimentally investigated. The experiments were conducted in CaCl 2 solutions, with and without NaCl. The distribution coefficient of strontium in calcite ( Sr 2+ C ) was found to be affected only slightly by temperature changes, and almost insignificantly by the presence of NaCl. Sr 2+ C values at 0.01 m Ca 2+ (its concentration in normal sea water) are: 0.055 at 40°C and 0.058 at 98°C. These results indicate that the low (around 500 ppm) concentration of strontium in ancient limestones could have been brought about by aragonite-to-calcite transformation in a system open to sea water, and are not necessarily indicative of replacement in fresh waters.

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