Abstract
Ilmenite in the Gabbro Picrite Zone of the Basistoppen sill, East Greenland, contains exsolution lamellae of baddeleyite and Fe-Cr-spinel. The relative proportions of baddeleyite and Fe-Cr-spinel in isolated ilmenite grains indicate that the ilmenite was reduced during subsolidus re-equilibration, although the sill in general was oxidized during cooling. Calculated pre-exsolution composition for the ilmenite contain up to 2. 4% Cr//2O//3 and up to 7100 ppm Zr. The calculated Zr-content is higher than that of any previously reported lunar or terrestrial ilmenite. The reduction-exsolution of Fe-Cr-spinel is considered the result of the incorporation of Cr in the ilmenite during crystallization at concentrations that exceeded the solubility limit of Cr in ilmenite at the temperature of re-equilibrium.
| Original language | English |
|---|---|
| Pages (from-to) | 91-96 |
| Number of pages | 6 |
| Journal | Canadian Mineralogist |
| Volume | 25 |
| Issue number | pt 1 |
| State | Published - Mar 1987 |
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