scholarly journals Rare-metal potential of placer deposits and weathering crusts of the Russian Arctic

2018 ◽  
pp. 111-122
Author(s):  
Alexander V. Lalomov ◽  
◽  
Anna A. Bochneva ◽  
Keyword(s):  
Rare Metal ◽  
Russian Arctic ◽  
Placer Deposits ◽  
Weathering Crusts

scholarly journals Unique Ultra-Rich Rare Metal Ores of the Tomtor Complex and Problem of Their Genesis

2019 ◽  
Vol 5 ◽  
pp. 70-88
Author(s):  
A.V. Lapin ◽  
A.V. Tolstov ◽  
I.M. Kulikova
Keyword(s):  
Mineral Composition ◽  
Rare Metal ◽  
Genetic Models ◽  
Textural Features ◽  
Weathering Crusts ◽  
Geologic Setting

Main genetic models of the formation of ultra-rich rare metal ores of the Tomtor deposit (Yakutia) are compared on the basis of their structural-textural features, mineral composition, and geologic setting: 1) reducing epigenesis of laterite weathering crusts of carbonatites and 2) redeposition of weathering products of carbonatites. It is shown that the unique features of the Tomtor deposit are explained by more complex (compared with other deposits of weathering crusts of carbonatites) evolution, which is expressed in two consecutive stages of supergenesis: laterite weathering and reducing epigenesis and their total ore-concentrating efects. The searching-forecast criteria for ores of the Tomtor type are suggested on the basis of epigenetic model of their formation.

scholarly journals Structural-lithological geological-genetic model and mineral composition of Krasnokutskaya rare-metal-titanium placer deposits (Ukraine)

2019 ◽  
pp. 540-556
Author(s):  
E. A. Ganja ◽  
A. V. Lalomov ◽  
A. V. Chefranova ◽  
A. V. Grigor’eva ◽  
L. O. Magazina
Keyword(s):  
Mineral Composition ◽  
Genetic Model ◽  
Rare Metal ◽  
Mineral Deposit ◽  
Donets Basin ◽  
The North ◽  
North Eastern ◽  
Placer Deposits ◽  
Metal Titanium

The conditions of the occurrence, structure, material composition and controlling factors of Krasnokutsky rare-metal-titanium placer deposit localized in the Miocene sediments of the North-Eastern slope of the Dnieper-Donets basin are investigated. Distinguished lithofacies complexes (alluvial-deltaic, coastal and shallow marine, aeolian) correspond to the Lower (Aquitanian), Middle (Burdigalian) and Upper (Langhian) members of Novopetrovskaya Formation of Miocene. Placer bodies are localized in the littoral marine-coastal complexes of Middle Novopetrovskaya sub-formation. Placerforming process is related to phases of stabilization of the shoreline of the regressive phase of the Sub-Paratetic basin. Main search and forecasting criteria for the identification of promising sites within the Kharkiv-Sumy placer-bearing zone are stabilization of the shoreline in the Middle Novopetrovskaya time simultaneously with development of transverse thereto alluvial-deltaic structures that supply weak mineralized sediments. Also, the deltaic ledge breaking the monotony coastal migration and playing the role of structural-sedimentary traps. The developed digital structural-lithological model of the Krasnokutskoye mineral deposit allows us to offer a set of criteria for comparative evaluation of different placer-bearing areas in order to determine the order of their development. The mineral composition of productive deposits is typical for the placers of the region and for rare-metal-titanium placers as a whole; the increased content of rutile and zircon, which rise the industrial value of placers of this zone, are associated with the influence of crystalline rocks of the Voronezh massif.

Geological-geophysical criteria for the prospecting and exploration of rare metal-titanium placer deposits: Evidence from the Transural region

2014 ◽  
Vol 49 (6) ◽  
pp. 505-518 ◽  
Author(s):  
R. M. Chefranov ◽  
A. V. Lalomov ◽  
A. A. Bochneva ◽  
A. V. Chefranova ◽  
D. P. Khrushchev ◽  
...  
Keyword(s):  
Rare Metal ◽  
Transural Region ◽  
Placer Deposits ◽  
Metal Titanium

Memorandum (1911) about a well-preserved mammoth from the Russian Arctic donated by Aleksander Stenbock-Fermor to Muséum National d'Histoire Naturelle, Paris

2005 ◽  
Vol 32 (1) ◽  
pp. 48-52
Author(s):  
P. Daszkiewicz
Keyword(s):  
Russian Arctic ◽  
Biographical Information

In 1911 Aleksander Stenbock-Fermor, a Russian aristocrat, offered the Muséum National d'Histoire Naturelle, Paris, a well-preserved mammoth from Lyakhowskiy Island, New Siberian Isles. This paper presents a hitherto unpublished memorandum that Stenbock-Fermor addressed to Edmond Perrier, the Museum's director, which related the circumstances surrounding the discovery, removal and transportation of the mammoth from Siberia to St Petersburg and thence to Paris. The paper also presents some biographical information on Konstany Wołłossowicz, who explored Siberia and who organized the expedition to Lyakhowskiy Island in order to bring the mammoth to Europe.

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