Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007gecoa..71.2240n&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 71, Issue 9, p. 2240-2249.
Physics
12
Scientific paper
Seeded calcite growth experiments were conducted at fixed pH (10.2) and two degrees of supersaturation (Ω = 5, 16), while varying the Ca2+ to CO32- solution ratio over several orders of magnitude. The calcite growth rate and the incorporation of Sr in the growing crystals strongly depended on the solution stoichiometry. At a constant degree of supersaturation, the growth rate was highest when the solution concentration ratio, r = [Ca2+]/[CO32-], equaled one, and decreased symmetrically with increasing or decreasing values of r. This behavior is consistent with the kink growth rate theory for non-Kossel crystals, assuming that the frequency factors for attachment to kink sites are the same for the cation and anion. Measured Sr partition coefficients, DSr, ranged from 0.02 to 0.12, and correlated positively with the calcite growth rate.
Bijma Jelle
Meile Christof
Nehrke Gernot
Reichart Gert-Jan
Van Cappellen Ph.
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