Grain size analysis and mineralogy of the Tremadocian Dictyonema shale
86) During the implementation of the Soviet uranium project, a top secret uranium factory (Kombinat No 7) was erected in Sillamae, and a test facility, officially called paint factory (krassilnaja fabrika), was established in Narva to test and develop the technology of extracting uranium from the Dictyonema shale
found in north-eastern Estonia (the average uranium content of Dictyonema shale
The target was composed of the stratified sedimentary cover comprising (from the top) bedded Upper and Middle Ordovician limestone (up to 20 m thick), Lower Ordovician Dictyonema shale
(argillite with an admixture of organic matter, about 2 m thick), and an up to 200 m thick layer of Lower Ordovician to uppermost Vendian sand, silt, and some clay, which covered the Precambrian basement consisting of granites, gneisses, amphibolites, and other crystalline rocks.
Mineralogy and geochemistry of obolus sandstones and dictyonema shale
of North Estonia.
In the world OS overviews, the Estonian kukersite and Dictyonema shale
reserves are assessed on the basis of their energetic value.
The name was applied to a transition between the Dictyonema Shale
(with many interbeds of quartzose sandstone in the lower part) of the Turisalu Formation and the Obolus Sandstone represented in NE Estonia.
On the distribution of graptolites in the Dictyonema shale
of Estonia and the noncontemporaneity of its different facies.
One sample comes from the Tremadocian graptolite-argillite, the Dictyonema shale
or argillite, as it was called in the earlier literature (for the change of the name see ), from a shallow shelf setting.
2%), and its main minerals [alumosilicates, carbonates, pyrite, quartz, kaolinite and halloysite, and enrichment residue of Dictyonema shale
Estonian argillites have for a long time been known as Dictyonema shale
, and the appearance of the first planktic graptolite Dictyonema flabelliforme (now Rhabdinopora flabelliformis) was taken as the local base of the Ordovician system.
3%, organic matter basis) and somewhat more semicoking gas (volumetric yield: dictyonema shale
Oxidation of dictyonema shale
in Maardu mining waste dumps // Oil Shale.