Experimental oxygen isotope fractionation between siderite-water and phosphoric acid liberated CO2-siderite
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Abstract
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: 103 ln α = 3.13 × 106T−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 CO2 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 Co2 also indicate C isotopic equilibrium during precipitation of siderite. The measured distribution of 13C between siderite and CO2 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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Experimental oxygen isotope fractionation between siderite-water and phosphoric acid liberated CO2-siderite |
| Series title | Geochimica et Cosmochimica Acta |
| DOI | 10.1016/0016-7037(88)90302-X |
| Volume | 52 |
| Issue | 10 |
| Year Published | 1988 |
| Language | English |
| Publisher | Elsevier |
| Description | 6 p. |
| First page | 2445 |
| Last page | 2450 |
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