Other
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2325l&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 9, pp.2325-2329
Other
3
Scientific paper
Dolomite was synthesized in hydrothermal bombs to assess influences on Mn partitioning into the Mg and Ca sites. Calcite was added to magnesium chloride solutions doped with 0, 10, 20, or 50 ppm Mn. Runs were made for 8 to 241 hr at 192 and 224°C. The calcium content of dolomite increased to 60-64% after 75 hr at 192°C and reverted to stoichiometry thereafter. Increases in the Mn content of the starter solution progressively retarded formation of dolomite. For dolomites formed without added Mn, or formed in less than 40 hr with 10 ppm added Mn, the ESR signals were too broad to permit determination of Mn site distribution ratios. Measurable ratios of Mn in the Mg site to Mn in the Ca site vary as a linear function of time, from 0.3 to 7 for samples prepared at 192°C and from 3 to 16 for those prepared at 224°C. Stoichiometric dolomites have higher Mn partitioning ratios than nonstoichiometric dolomites, as observed in natural systems. Dolomites formed in supratidal/sabkha, early groundwater, and Dorag conditions may differ in their Mn signature from those formed during burial diagenesis.
Lloyd Roger V.
Lumsden David N.
Shipe Lisa G.
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