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- W2012122935 abstract "Ilmenites occurring in amphibolite and granulite-facies orthogneisses in Sri Lanka yield precise U-Pb ages. Coexisting ilmenite-magnetite in the granulite-facies rocks indicate temperature conditions of 680 ± 60°C and log ƒO2 = −17.0 ± 1.2. The U-Pb age of 498.2 ± 3.3 Ma obtained for ilmenite is indistinguishable from the Pb-Pb age of 501 ±5 Ma derived for coexisting silicate minerals, and suggests that oxide-silicate equilibration has been preserved. In contrast, Fe-Ti oxides in adjacent amphibolitefacies rocks indicate a temperature of 830 ± 60°C and log ƒO2 = −12.7 ± 0.8 and record U-Pb ages of 1093.7 ± 7.6 Ma and 1095.4 ± 4.2 Ma. These ages are some 600 Ma older than those obtained for coexisting silicate phases in the same sample, or for both oxide and silicate minerals in the nearby charnockite and relate either to the time of emplacement of the granitic precursor or to some earlier metamorphic episode. These results suggest that temperature, ƒO2 and fluid conditions estimated from Fe-Ti oxides should be interpreted with extreme caution." @default.
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- W2012122935 title "Fe-Ti oxide chronometry: With application to granulite formation" @default.
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- W2012122935 doi "https://doi.org/10.1016/0016-7037(90)90245-g" @default.
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