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- W107644906 abstract "The metamorphic reconstitution of ores in a deposit of primary sedimentary accumulations is described. The uranium mineralization was confined to layers of highly metamorphosed sedimentary rocks of upper Paleozoic age and was in the proximity of zones of upper Cretaceous granitic intrusions. Indications of premineralization ore-control structures were absent, except for the marked attraction of ore concentration to small anticlinal uplifts which occur in parts of the deposit. The ore bodies are tn a bedded form and are restricted to a single stratigraphic horizon, the roof rock of a diabase sill. The mineralization is localized in beds of medium-grained sandstones and is completely absent from phyllites and silty sandstones. There is no relationship between mineralization and the chemical and mineral composition of the host rock. The uraninite in the sandstone cement has a hydrothermal-metasomatic nature. The metamorphic transformations in the bedded ores during later separation from the uraninite of such metamorphic minerals as diopside, albite, and others are clearly indicated. The uraninites of all bedded ores have common geochemical features, but the uraninite in vein-like bodies is distinctive. Near-ore alteration of the host rocks is absent, and there is insignificant introduction of elements during metamorphism. A hydrothermal-metamorphic origin of themore » ore concentration is assumed for a simple and logical explanation of these features. (J.S.R.)« less" @default.
- W107644906 created "2016-06-24" @default.
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- W107644906 date "1958-01-01" @default.
- W107644906 modified "2023-09-27" @default.
- W107644906 title "METAMORPHISM OF URANIUM ORES" @default.
- W107644906 hasPublicationYear "1958" @default.
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