Mathematics – Logic
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59..979r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 59, Issue 5, pp.979-990
Mathematics
Logic
4
Scientific paper
The 18 0 of carbonate minerals in a seasonally stratified hypersaline lake are > +2.3% PDB and are inconsistent with calculated 18 O values for carbonate in equilibrium with the lake water during the spring and winter. When the lake is stratified, the calculated 18 O of carbonate that would precipitate from the water column is less than that measured in the sediment because of freshwater dilution in the mixolimnion and high temperatures (up to 46°C) in the monimolimnion. Thermodynamic calculations indicate that the lake is supersaturated with respect to carbonate phases throughout the year. However, the 18 O data indicate that carbonate is precipitated during the late summer and autumn when the lake is unstratified, biologic activity is high, and the water temperature is moderate. The 13 C values of the calcium carbonate minerals precipitated in the lake are heavier than the dissolved inorganic carbon values ( 13 C DIC ) of the lake water and cannot be explained by kinetic fractionation, indicating a biologic control on primary carbonate precipitation. The 13 C of dolomite found in the lake sediments are in equilibrium with porewater 13 C DIC , suggesting a high degree of porewater interaction in dolomitization. Both the 18 O and 13 C compositions of the dolomite suggest that it formed in equilibrium with current porewater but not in equilibrium with the coexisting calcium carbonate minerals.
Coshell Lee
Gailitis Vit
Rosen Michael R.
Turner Jeffrey V.
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