Manganese uptake during calcite precipitation from seawater: Conditions leading to the formation of a pseudokutnahorite

Details Manganese uptake during calcite precipitation from seawater: Conditions leading to the formation of a pseudokutnahorite Manganese uptake during calcite precipitation from seawater: Conditions leading to the formation of a pseudokutnahorite

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1859m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 52, Issue 7, pp.1859-1868

Computer Science

8

Scientific paper

Manganoan magnesian calcite overgrowths were precipitated from artificial seawater at 25°C on pure calcite seeds using a constant disequilibrium technique. The composition of the overgrowths, and more specifically their Mn, Mg, Na and Sr content, was determined as a function of the precipitation rate and Mn 2+ concentration in the parent solution. X-ray diffraction patterns indicate that the overgrowths produced were one-phase multicomponent solid solutions, and contained up to 40 mole% MnCO 3 . The amount of Mn coprecipitated with calcite decreased with increasing precipitation rate. Thus, overgrowths are not in exchange equilibrium with the solutions from which they precipitated. A kinetic model is proposed which adequately describes the composition of the overgrowths in terms of the relative precipitation rate of an 8-10 mole% magnesian calcite and a "pseudokutnahorite" from seawater. The possible existence of a pseudokutnahorite in marine sediments and its implications are discussed. The concentration of Mg in the overgrowths decreased with increasing MnCO 3 content, but their Mg:Ca ratio remained nearly constant. Strontium and Na incorporation was strongly dependent on the number of available nonlattices sites.

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