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Dependence of calcite growth rate and Sr partitioning on solution stoichiometry: Non-Kossel crystal growth

By G. Nehrke, G.-J. Reichart, P. Van Cappellen, C. Meile and J. Bijma

Abstract

Seeded calcite growth experiments were conducted at fixed pH (10.2) and two degrees of supersaturation (Ω = 5, 16), while\ud varying the Ca2+ to CO3\ud 2- solution ratio over several orders of magnitude. The calcite growth rate and the incorporation of\ud Sr in the growing crystals strongly depended on the solution stoichiometry. At a constant degree of supersaturation, the\ud growth rate was highest when the solution concentration ratio, r = [Ca2+]/[CO3\ud 2-], equaled one, and decreased symmetrically\ud with increasing or decreasing values of r. This behavior is consistent with the kink growth rate theory for non-Kossel crystals,\ud assuming that the frequency factors for attachment to kink sites are the same for the cation and anion. Measured Sr partition\ud coefficients, DSr, ranged from 0.02 to 0.12, and correlated positively with the calcite growth rate

Topics: Aardwetenschappen, Geowetenschappen en aanverwante (milieu)wetenschappen
Year: 2007
OAI identifier: oai:dspace.library.uu.nl:1874/31636
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