Other
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008e%26psl.268..330s&link_type=abstract
Earth and Planetary Science Letters, Volume 268, Issue 3-4, p. 330-338.
Other
19
Scientific paper
The iron isotopic fractionation factor between magnetite and fayalite was measured at high temperature in a piston-cylinder apparatus. For the first time, the three-isotope method [Matsuhisa, J., Goldsmith, J. R., and Clayton, R. N., 1978. Mechanisms of hydrothermal crystallisation of quartz at 250 °C and 15 kbar. Geochim. Cosmochim. Acta 42, 173-182.] has been used to determine equilibrium fractionation between two minerals directly. The experimentally-determined temperature-dependent iron isotope fractionation between fayalite and magnetite is described by 103ln α57Mag-Fa ≅ Δ57FeMag-Fa = 0.30 (+/- 0.024) × 106 / T2. The equation predicts measurable fractionation at magmatic temperatures. Our work bears on the magnitude of Fe isotope fractionation attending differentiation in magmatic systems and provides a new isotope thermometer for co-existing fayalite and magnetite.
Manning Craig E.
Shahar Anat
Young Edward D.
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