scholarly journals On the relation between the rare-earth — rare-metal and gold ore mineralization and fault-block tectonics of the Ukrainian Shield. 1

2019 ◽  
Vol 41 (1) ◽  
pp. 3-32
Author(s):  
S. V. Nechaev ◽  
O.B. Gintov ◽  
S. V. Mychak
Keyword(s):  
Rare Earth ◽  
Rare Metal ◽  
Ukrainian Shield ◽  
Gold Ore ◽  
Fault Block ◽  
Ore Mineralization ◽  
The Rare Earth

scholarly journals GRANITOIDS, RARE-METAL PEGMATITES AND Ta-Nb MINERALIZATION OF SHPOLIANO-TASHLYK ORE AREA (INGUL MEGABLOCK, UKRAINIAN SHIELD)

2018 ◽  
pp. 24-29
Author(s):  
O. Hrinchenko ◽  
S. Bondarenko ◽  
T. Mironchuk
Keyword(s):  
Rare Metal ◽  
Ukrainian Shield ◽  
Wide Range ◽  
Ore Minerals ◽  
Ore Mineralization ◽  
Isomorphic Series ◽  
Single Complex ◽  
Complex Features ◽  
First Time ◽  
Range Of Values

Composition of granites, genetically associated pegmatites and superimposed metasomatites distributed within Shpoliano-Tashlyk ore area (Ingul megablock) is considered. It is established, that on the basis of similarity in their petrographic and petrochemical features granitoids of the area can be related to single complex. Features of ore mineralization are defined by both composition of granitoids (Sgranites) after which rare-metal pegmatites are formed and intensity of superimposed metasomatic alterations. Main minerals-concentrators of Ta and Nb mineralization in granitic pegmatites and metasomatites are represented by minerals of three isomorphic series – columbite-tantalite (Fe,Mn)(Nb,Ta,Ti)2O6, ilmenorutile-struverite (Ti,Nb,Ta)O2 and pyrochlore-microlite (Ca,Na)2Ta2O6(O,B,OH,F). Depending on geological setting such ore minerals as tapiolite, ixiolite, cassiterite, uraninite, nigerite, gahnite are commonly found in association with these minerals. Chemical composion of tantalo-niobates sampled from ore-bearing pegmatites and metasomatites is investigated by microprobe analysis. Most minerals of columbite-tantalite series are characterized by distinct and rhythmic internal zonality and contrasting mosaic structure which are related to considerable heterogeneities of their chemical composition. Within one aggregate mineral phases with wide range of values – from 9,80 to 71,0 % for Ta2O5 and from 10,6 to 70,1 % for Nb2O5 – are established. Among minerals ferruginous varieties which composition relates to Fe-columbite-tantalites (Nb2O5/Ta2O5 = 1–1,2; FeO/MnO = 2,5–6) prevail. Columbite-tantalites are characterised by high contents of admixture elements present (%): TiO2 – to 5,88; WO3 – to 3,70; SnO2 – to 9,20; Sc2O3 – to 5,40. Scandium ores occur as scandium-rich minerals that are mostly confined to the minerals of columbite-tantalite series found in Polohivka ore field. On the Ukrainian Shield high contents of Sc2O3 in tantalo-niobates are established for the first time. Minerals of ilmenorutile-struverite series do not quantitatively yield to minerals of columbite-tantalite series. For minerals of this series Nb2O5/Ta2O5 ratio varies in the range of 0,6-1,4. Among characteristic admixture-elements are prevailed (%): SnO2 – to 3,1, V2O5 – to 5,05; FeO – to 11,51, Cr2O3 – to 1,20. Minerals of pyrochlore-microlite series are of subordinate importance. For the first time by results of U-Pb dating of columbite-tantalites from Mostove ore manifestation (Shpoliano-Tashlyk area) the age of Ta-Nb mineralization is established to be about 1965 ± 25 million years.

scholarly journals FEATURES OF BERILLIUM AND RARE METAL MINERALIZATION IN SYENITE OF THE PERGA DEPOSIT (UKRAINIAN SHIELD)

2020 ◽  
pp. 92-97
Author(s):  
О. Dubyna ◽  
S. Kryvdik ◽  
V. Belskyy ◽  
О. Vyshnevskyi
Keyword(s):  
Rare Earth ◽  
Fluid Phase ◽  
Rare Metal ◽  
Geochemical Characteristics ◽  
Ukrainian Shield ◽  
Alkaline Solutions ◽  
Published Data ◽  
Rare Metals ◽  
Rare Metal Mineralization ◽  
Mn Content

The results of the ore and accessory minerals study in the syenite of the Perga beryllium deposit are discussed. Phenakite and genthelvite are found among Be-bearing minerals. Genthelvite of this syenite, being compared to early published data on genthelvite of the Perga deposit, is distinguished by the highest ZnO content which is close to the theoretical maximum) due to the alkaline nature of studied rock ((Na + K)/Al = 1.09). Genthelvite occurs as later mineral to phenakite or is formed by phenakite replacement at rising the alkalinity as a result of melt differentiation. Columbite with high-Mn content, Y-silicate (keiviite-(Y)?), rare-earth fluorocarbonate (bastnesite) are also found among other minerals of rare metals. The presence of fluorite and rare-earth fluorocarbonate in association with genthelvite or phenakite may indicate that Be and REE were transported in ore-bearing fluids as complex fluorine-carbonate compounds. Considering the geochemical characteristics of rocks (meta-aluminous, subalkaline and alkaline series, deep negative Euanomalies, low Sr, Ba, elevated – HFS elements) from the Sushcano-Perga region, enrichment of these rocks with rare metals and Be are related to intensive feldspar fractionation of the primary melts and due to alkaline oversaturation, volatile and rare metals (Be, Li, REE, Y, Nb, Ta) enrichment in the residual fractions of granitic or syenitic compositions. Postmagmatic alkaline solutions enriched in F and CO32- promote of Be concentration in fluid phase with its following migration and crystallization as genthelvite.

scholarly journals PEGMATITES AS A SOURCE OF RARE-METAL AND RARE-EARTH MINERALIZATION WITHIN THE CENTRAL AND WESTERN PARTS OF THE UKRAINIAN SHIELD

2018 ◽  
pp. 8-11
Author(s):  
A. P. Vasylenko ◽  
L. V. Isakov
Keyword(s):  
Rare Earth ◽  
Internal Structure ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Rare Metal ◽  
Ukrainian Shield ◽  
Structural Units ◽  
Fourth Group ◽  
The Third

Regularities in the distribution of rare-metal and rare-earth pegmatites within the Western and Central parts of the Ukrainian shield are determined. New geological criteria and search signs for rare-metal and rare-earth mineralization have been developed. The first group includes the forecasting criteria that are tied to the general patterns of location of pegmatites in time (geochronological) and space (megastructural). These criteria define the main structural units (pegmatites provinces, regions, districts) and their metallogenic specialization. The second group combines regional criteria among which are distinguished tectonostructural, magmatic and metamorphic. These forecasting criteria define the formation and localization of the pegmatite belts and fields. The third group consists of criteria that emerge from the conditions for the formation and localization of pegmatite nodes and bundles. The fourth group are the criteria of pegmatite bodies that can be identified during study their internal structure. These are mineralogical-geochemical, structural-textural, petrochemical, thermobarochemical and thermoluminescent. Prospects for further work aimed at identifying new rare-metal and rare-earth metal deposits within pegmatite-bearing fields are estimated.

scholarly journals Prospects for discovery of industrial concentrations of rare and rare-earth elements in the Alekseevsko-Lysogorskiy uranium-ore area of Ingulskiy megablock of the Ukrainian shield

2019 ◽  
pp. 3-10 ◽  
Author(s):  
G. A. Kalashnyk
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
General Pattern ◽  
Rare Metal ◽  
Uranium Mineralization ◽  
Raw Material ◽  
Ukrainian Shield ◽  
Material Base ◽  
Uranium Ore ◽  
Rare Metal Mineralization

The article presents the results of the assessment of the prospects for discovery of industrial concentrations of rare and rare-earth elements in the Alekseevsko-Lysogorskiy uranium-ore area of Ingulskiy megablock of the Ukrainian Shield. General pattern in the distribution of industrial objects of rare-metal and uranium mineralization in the Ingulskiy megablock of the Ukrainian Shield, caused by similar deep-seated factors of ore formation, are revealed. The complex of regional and criteria of uranium mineralization of a rare-earth-thorium-uranium formation in silicon-potassium metasomatites of the Alekseevsko-Lysogorskiy ore region is substantiated: geological-structural, mineralogical-geochemical, hydrogeological. There were presented characteristic local features of manifestations of rare-metal mineralization in this region. Based on the results of the analysis of geological and geophysical materials, it was possible to identify new uranium and complex uranium rare-metal deposits with higher mineralization parameters in optimal geological and structural conditions in the Alekseevsko-Lysogorskiy uranium ore region. There has been established the possibility of identifying within the limits of known uranium ore fields, manifestations of uranium mineralization of the rank such as deposit, ore occurrence of this uranium ore region of industrial concentrations of rare and rare-earth elements. The possibility of increasing the value of known deposits and ore occurrences of uranium of the Alekseevsko-Lysogorskiy uranium ore region due to the complexity of ore use is substantiated. According to the degree of manifestation of the complex of criteria, prospective ore and potentially ore zones are discovered for possible detection of industrial concentrations of rare metals and rare-earth elements within the Alekseevsko-Lysogorskiy ore region. There were developed recommendations for further research in the Alekseevsko-Lysogorskiy uranium ore region with the aim of improving the quality of the raw material base of rare and rare-earth elements.

scholarly journals Prospects of the Tymoshivsko-Znamianskyi potential rare-metal ore area of Inhulskyi megablock of the Ukrainian Shield

2020 ◽  
pp. 3-12
Author(s):  
G. A. Kalashnyk
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Structural Control ◽  
Great Part ◽  
Rare Metal ◽  
Raw Material ◽  
Ukrainian Shield ◽  
Material Base ◽  
Hydrothermal Mineralization ◽  
Genetic Types

The article presents the results of the assessment of the prospects for discovery of industrial concentrations of rare and rare-earth elements in the Tymoshivsko-Znamianskyi potential rare-metal ore area of Inhulskyi megablock of the Ukrainian Shield. The results of studies of regularities of raremetalmineralization’s placement in Tymoshivsko-Znamianskyi potential ore region of the Inhulskyi megablock of the Ukrainian Shield are presented. The structural control of the great part of the detected geochemical anomalies, geochemical halos, manifestations and ore manifestations by certain systems of rupture faults and their intersection nodes is determined. The typical local features of manifestations of rare metal mineralization in small uranium deposits and large ore manifestations of this region and uranium mineralization of different genetic types, in particular hydrothermal mineralization of vein-stockwork type in mineralized fault zones are presented. According to the degree of manifestation of the complex of criteria, prospective ore and potentially ore nodes are discovered for possible detection of industrial concentrations of rare metals and rare-earth elements within the Tymoshivsko- Znamianskyi potential ore region, as well as uranium ores of various genetic types, in particular superimposed rich hydrothermal mineralization of vein-stockwork type. There were developed recommendations for further research in the Tymoshivsko-Znamianskyi potential ore region with the aim of farther development of rare and rare-earth elements raw material base.

scholarly journals Complex processing of titanium-rare metal raw material

2018 ◽  
Vol 56 ◽  
pp. 03019
Author(s):  
Mikhail Medkov ◽  
Galina Krysenko ◽  
Dantiy Epov ◽  
Pavel Sitnik ◽  
Valentin Avramenko
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Raw Materials ◽  
Rare Metal ◽  
Raw Material ◽  
Insoluble Residue ◽  
Ammonium Hydrodifluoride ◽  
Fluoroammonium Salts ◽  
Main Components ◽  
The Rare Earth

The paper is devoted to investigation of the complex processing of titanium-rare metal raw materials with ammonium hydrodifluoride. It is stated that fluorination of the main components of the mineral raw materials with ammonium hydrodifluoride proceeds with formation of complex ammonium fluorometallates and simple fluorides. It is showed that in the process of aqueous leaching of the fluorinated mineral raw material niobium and tantalum completely pass into solution together with titanium, iron, and silicon fluoroammonium salts while all the rare-earth elements stay in the insoluble residue as complex fluorosodium salts together with CaF2. The method of separation of the fluoroammonium salts with obtaining marketable products and isolation of the rare-earth elements from the insoluble residue is offered.

Flame spectra of the rare-earth elements*

1962 ◽  
Vol 18 (4) ◽  
pp. 1127-1153
Author(s):  
V FASSEL ◽  
R CURRY ◽  
R KNISELEY
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
The Rare Earth
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