Experimental oxygen isotope fractionation between siderite-water and phosphoric acid liberated CO 2 -siderite

Details Experimental oxygen isotope fractionation between siderite-water and phosphoric acid liberated CO 2 -siderite Experimental oxygen isotope fractionation between siderite-water and phosphoric acid liberated CO 2 -siderite

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.2445c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 52, Issue 10, pp.2445-2450

Computer Science

31

Scientific paper

The equilibrium fractionation of O isotopes between synthetic siderite and water has been measured at temperatures ranging from 33° to 197°C. The fractionation between siderite and water over this temperature range can be represented by the equation: 10 3 ln = 3.13 × 10 6 T -2 - 3.50. Comparison between the experimental and theoretical fractionations is favorable only at approximately 200°C; at lower temperatures, they generally differ by up to 2 permil. Siderite was prepared by the slow addition of ferrous chloride solutions to sodium bicarbonate solutions at the experimental temperatures. It was also used to determine the O isotope fractionation factors between phosphoric acid liberated CO 2 and siderite. The fractionation factors for this pair at 25° and 50°C are 1.01175 and 1.01075, respectively. Preliminary results of the measured C isotope fractionation between siderite and Co 2 also indicate C isotopic equilibrium during precipitation of siderite. The measured distribution of 13 C between siderite and CO 2 coincides with the theoretical values only at about 120°C. Experimental and theoretical C fractionations differ up to 3 permil at higher and lower temperatures.

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