Computer Science
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.2229l&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 46, Issue 11, pp.2229-2237
Computer Science
8
Scientific paper
A review of experimental and natural Mg-calcite occurrences indicates that no simple relation exists between mMg / mCa in solution and X Mg / X ca in growing calcite crystals. The great variability of the data suggests a strong influence of precipitation kinetics on the distribution of Mg +2 between solution and crystal. We have derived a kinetic formulation for the distribution coefficient ( Mg = X Mg / X Ca / mMg / mCa ) based upon the existence, at steady state conditions, of a constant mass surface phase. The resulting formulation is consistent with both experimental and natural Mg-calcite compositions. The primary factors which influence the value of Mg are temperature and the ratio of K sp MCO 3 to the activity product ([M +2 ][CO 3 -2 ]/[MCO 3 ]) for magnesite and calcite. The results suggest that Mg-calcite composition ( X Mg / X Ca ) is at best a crude measure of the mMg/mCa ratio in paleosolutions.
Lahann R. W.
Siebert R. M.
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