Aragonite is precipitated by a new CO2-diffusion technique from a Ca2+-Mg2+-Cl- solution between 10 and 50 °C. Crystallisation of aragonite instead of calcite occurs by maintaining a [Mg2+]/[Ca2+] ratio of 2 in the fluid. The dissolved inorganic carbon (DIC) is received by diffusion of CO2 through a polyethylene membrane (diffusion coefficient: DCO2 =10-6.4 cm2 s-1 at 19 °C). It is suggested that significant amounts of DIC may be transferred by diffusion of CO2 in natural systems if the CO2 gradient is high. The CO2 -diffusion technique is used as a kind of simple mixed flow reactor for the co-precipitation of barium and strontium with aragonite. The distribution coefficients of Ba2+ and Sr2+ decrease from 10 to 50 °C according to D* Ba,a =2.42-0.03595 T (°C) and D* Sr,a =1.32-0.005091 T (°C). At 25 °C, the distribution coefficients are D* Ba,a =1.5±0.1 and D* Sr,a =1.19±0.03. The effect of temperature on D* Ba,a is about one order of magnitude higher versus that on D* Sr,a. Thus, Ba2+ may be a potential paleotemperature indicator if the composition of the solution is known.
ASJC Scopus subject areas
- Geochemistry and Petrology