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- W20909891 abstract "Outcroppings of uranium-bearing lutites are to be found in the Western fold of the San Juan foot-hills. These sediments, which are a part of the eopaleozoic formations which constitute the foot-hills, make up a large area of such outcroppings. Their thickness varies from some tens to some hundreds of meters, according to the location. The dominant orientution is NorthSouth, with a variable dip. In some areas, they are folded and very much broken (Calingastu). They are finely stratified, pitch blaek to greyish black in color, when altered. They consist, in the main, of clayey material, organic matter, and quartz, with some carbonates, pyrite, hematite, and sericite. Their composition is not homogeneous, as shown by microscopic and chemical analyses. These sediments are of marine origin, and seem to belong to the Ordovician. In some parts, they contain fossils. Their U/sub 3/O/sub 8/ content, as determined fluorometrically, varies between 20 and 30 grams per ton. (auth)" @default.
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- W20909891 date "1959-10-31" @default.
- W20909891 modified "2023-09-27" @default.
- W20909891 title "A CONTRIBUTION TO THE KNOWLEDGE OF THE URANIFEROUS LUTITES OF THE PROVINCE OF SAN JUAN (ARGENTINA)" @default.
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