Computer Science
Scientific paper
Feb 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002gecoa..66..589d&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 66, Issue 4, pp.589-593
Computer Science
4
Scientific paper
New experimental results are reported on oxygen isotope fractionation factors, T , between the 18 O compositions of carbon dioxide liberated by phosphoric acid in the temperature interval of 323 to 373K and that of total oxygen from a natural magnesite (MgCO 3 ). These results are distinctly different from some previously published mutually inconsistent data, and can be expressed as a linear relationship: 10 3 ln T = [{(6.845 ± 0.475)*10 5 }/T 2 ] + (4.22 ± 0.08), where 10 3 ln T refers to fractionation at different temperatures T in Kelvin. Fractionation factors have also been determined at 323 and 368K on a natural calcite. The results on calcite are in excellent agreement with previously published data and can be written as:10 3 ln T = [{(5.608 ± 0.151)*10 5 }/T 2 ] + (3.89 ± 0.08). The combined results on magnesite and calcite yield a computed value of = 1.01117 for dolomite at 298K, assuming equal proportion of 0.5 mole of magnesium and calcium in dolomite, the previously reported experimental values being 1.01109 and 1.01110.
Das Sharma Subrata
Gopalan Kartik
Patil D. J.
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