Titanium and rare metal mineralization in arenaceous reservoir rocks of South Timan oil fields |
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| Abstract: | Riphean metamorphic schists dipping into the Pechora trough contain leucoxenized porphyroblasts of rare earth sphene and ilmenite. Rutile leucoxene occurring in Devonian sediments overlying the schists was derived from the rare earth sphene and ilmenite by secondary crystallization of randomly oriented rutile microcrystals intergrown with quartz microcrystals. A light gray variety of rutile leucoxene contains 56.3 to 60.8% titanium dioxide; dark gray rutile leucoxene, the other variety, contains 57.1 to 67% titanium dioxide. Niobium, tantalum, and rare earths, present in fractions of a percentage, are thought to be of economic importance. It is considered that concentrations of zircon and rutile leucoxene represent offshore deposition in the deeper parts of a Devonian marine basin. Data were derived from examination of drill cores from the Devonian section of an oil field located on the southeast slope of the Timan range. |
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