ESTIMATION PARAMETERS OF POTENTIAL VERESOBORSKY MASSIF AREAS PRODUCTIVITY FOR PRIMARY Pt MINERALIZATION, MIDDLE URALS

2020 ◽  
pp. 32-38
Author(s):  
A. P. Motov ◽  
Yu. E. Malakh
Keyword(s):  
Comparative Evaluation ◽  
Chemical Elements ◽  
Middle Urals ◽  
The Urals ◽  
Local Areas ◽  
Accumulation Trend ◽  
Estimation Parameters ◽  
Representative Material

The analysis of statistically representative material of lithochemical sampling within Veresoborsky dunite massif revealed a group of correlating chemical elements (Cr, Mn, Co, Ni, Bi, Sn, W, Zn) whose accumulation trend coincides with that of Pt. The established pattern enables proposing criteria of comparative evaluation regarding primary Pt mineralization productivity of local areas (0,5-3 km2) in both Veresoborsky massif and its counterparts composed of the Urals Kachkanarsky complex (υO3k) rocks.

The first results of isotopic (U-Pb, ID-TIMS) dating of individual zircon grains from dolerite dikes of the Eastern zone of the Urals

LITOSFERA ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 224-230
Author(s):  
V. N. Smirnov ◽  
K. S. Ivanov ◽  
T. V. Bayanova
Keyword(s):  
Isotope Geochemistry ◽  
Early Carboniferous ◽  
Dynamic Mode ◽  
Middle Urals ◽  
Volcanic Complex ◽  
The Urals ◽  
Electron Multiplier ◽  
The Middle Urals ◽  
Eastern Zone ◽  
First Results

Research subject. The article presents the results of dating two dolerite dikes differing in geochemical features from a section along the Iset river in the area of Smolinskoe settlement (the Eastern zone of the Middle Urals). Materials and methods. The dating was performed by an U-Pb ID-TIMS technique for single zircon grains using an artificial 205Pb/235U tracer in the laboratory of geochronology and isotope geochemistry of the Geological Institute of the Kola Science Centre of the Russian Academy of Sciences. The lead isotopic composition and uranium and lead concentrations were measured using a Finnigan-MAT (RPQ) seven-channel mass spectrometer in dynamic mode using a secondary electron multiplier and RPQ quadrupole in ion counting mode. Results. The dikes were dated 330 ± 3 Ma and 240 ± 2 Ma. Conclusions. The research results indicate different ages of dolerite dikes developed within the Eastern zone of the Middle Urals. The oldest of the two established age levels corresponds to the Early Carboniferous era. This fact, along with the proximity of the dolerites to the petrochemical features of the basaltoids of the Early Carboniferous Beklenischevsky volcanic complex, allows these bodies to be considered as hypabyssal comagmates of these volcanics. The youngest obtained age level – Triassic – indicates that the introduction of some dolerite dikes was associated with the final phases of the trapp formation developed rarely within the eastern outskirts of the Urals and widely further east in the foundation (pre-Jurassic basement) of the West-Siberian Plate.

scholarly journals Newly recorded and rare Desmidiales (Charophyta: Conjugatophyceae) from the Middle Urals, Russia

Check List ◽  
2016 ◽  
Vol 12 (6) ◽  
pp. 2013
Author(s):  
Andrey S. Shakhmatov
Keyword(s):  
Rare Species ◽  
Global Distribution ◽  
Middle Urals ◽  
The Urals ◽  
The Middle Urals

New disributional data on 14 previously unrecorded or rare species and varieties of algae belonging to Closteriaceae, Desmidiaceae, Gonatozygaceae and Peni­aceae (order Desmidiales) are presented for the Middle Urals. Closterium cornu Ehrenberg ex Ralfs, Closterium macilentum Brébisson, Closterium navicula (Brébisson) Lütkemüller, and Cosmarium crenulatum Nägeli are newly recorded to the Urals. A brief description, including measurements of cells as well as regional and global distribution, is given for each taxon.

scholarly journals Structural connections between Urals and West Siberia: the common stage on the boundary of Permian and Triassic periods

2019 ◽  
Vol 488 (3) ◽  
pp. 294-297
Author(s):  
V. N. Smirnov ◽  
K. S. Ivanov
Keyword(s):  
West Siberia ◽  
Strike Slip ◽  
Middle Urals ◽  
The Urals ◽  
The West ◽  
Open Part ◽  
The Middle Urals ◽  
Eastern Zone ◽  
Structural Connections ◽  
The Common

40Ar/39Ar-dating of the micas from the schists and blastomylonites collected from the fault which separates the Eastern zone of the Middle Urals dipped under the cover of the West Siberian plate from the open part of the geologic structures of the Urals, showed that the last phase of deformation was represented by a submeridional sinistral strike-slip faults with the age of 251 Ma. The appearance of the analyzed deformations practically exactly coincides in time with the formation of the grabens of meridional strike at the base of the West Siberian plate. 

Cosmogenic 3He in detrital Pt-alloy grains: tracing the accumulation of critical metals

2021 ◽  
Author(s):  
Olga Yakubovich ◽  
Finlay Stuart ◽  
Alexander Mochalov ◽  
Roman Palamarchuk
Keyword(s):  
Source Rock ◽  
Total Duration ◽  
River System ◽  
Placer Deposit ◽  
Middle Urals ◽  
The Urals ◽  
Critical Metals ◽  
Pt Alloy ◽  
Placer Deposits ◽  
Exposure Ages

<p>The application of cosmogenic noble gases (<sup>3</sup>He and <sup>21</sup>Ne) in detrital grains to quantify sediment transport rates and storage timescales is largely undeveloped. We have previously shown that cosmogenic He can be measured in single grains (Yakubovich et al. 2019). The low He diffusion rate and the chemical and/or physical robustness of metal alloys (eg Au, Ag, Cu, Pt, Fe) means the technique has potential to determine how critical metals accumulate at the Earth surface.  In an effort to determine how long detrital Pt-alloy grains spend travelling to placer deposits we have measured cosmogenic<sup>3</sup>He concentrations in 60 (0.5–7 mg) grains of isoferroplatinum (Pt<sub>3</sub>Fe) from the world largest alluvial Pt placer deposits in the Kondyor-Uorgalan rivers in Khabarovsk region, and the Is-Turinsk and Nyas’ma river systems in Middle Urals, Russia.</p><p>In both systems, there are no significant cosmogenic <sup>3</sup>He in the grains from the low order streams that drain the source rock. <sup>3</sup>He<sub>cos</sub>concentrations in Pt grains from distant placers (30 km) varies in order of magnitude from 0.3 to 30 x 10<sup>7</sup>at g<sup>-1</sup>in grains in Uorgalan river, 5 to 40 x 10<sup>7</sup>at g<sup>-1</sup>in Glubokinskoe placer deposit (Is river) and 20 to 70 x 10<sup>7</sup>at g<sup>-1</sup>in the Generalka deposit (Nyas’ma river). Converting this to surface residence times (P = 25 at g y<sup>-1</sup>, Yakubovich et al., 2019) yields model exposure durations of0.1­–10, 3–20 and 13–38 Myr for grains from the Uorgalan, Glubokinskoe and Generalka deposits respectively. Assuming that all grains were extracted from shielded locations this exposure ages indicate the total time of transport and residence of the grains on river bed surface prior to final deposition.</p><p>Pt grains are added to the river system constantly. If we assume that the average transport conditions are essentially identical for all grains, then the difference between the maximum and minimum exposure ages within the same location indicates the total duration of placer supply from the source rock. For the Urals it is equal for 17–25 Myr, while for Kondyor-Uorgalan placer it is 10 Myr. This is in a good agreement with geological observations. Within Kondyor-Uorgalan placer deposit the age of the alluvium varies from Neogene to Quaternary, while in the Urals Pt-bearing Jurassic, Neogene and Quaternary fluvial sediments are distinguished within the placers.</p><p>Paleo peneplain surfaces are established nearby the Kondyor massif and pre-date the most productive platinum sands. Several stages of peneplenisation are evident in the Urals from thick weathering crusts. The exposure ages indicate10’s million-year scale of transport/deposition histories of detrital Pt alloys, which might result of multiple redeposition of material during long term accumulation of cosmogenic <sup>3</sup>He during peneplenisation.  </p><p>Yakubovich O., Stuart F.M., Nesterenok A. and Carracedo A. (2019). Chem. Geol. 517, 22-33.</p>

scholarly journals Evaluation of strawberry varieties by biochemical composition and commercial qualities under the conditions of Orenburg Urals

2019 ◽  
pp. 26-34 ◽  
Author(s):  
A. A. Mushinsky ◽  
E. V. Aminova ◽  
Z. A. Avdeeva ◽  
T. A. Tumaevа ◽  
A. A. Borisova ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Vitamin C ◽  
Comparative Evaluation ◽  
Weather Conditions ◽  
Commercial Production ◽  
Biologically Active ◽  
Soluble Solids ◽  
Average Content ◽  
The Urals ◽  
Experimental Station

The article presents the results of studies of the chemical composition, commercial qualities and taste of berries of promising strawberry varieties breeding of the All-Russian Horticultural Institute for Breeding, Agrotechnology and Nursery (Moscow) in the conditions of the Orenburg Urals. The studies were carried out in 2016-2018 on the basis of the Orenburg Experimental Station of Horticulture and Viticulture of the All-Russian Horticultural Institute for Breeding, Agrotechnology and Nursery in specific conditions, where almost annually dry and moderately dry climatic periods were observed during the formation of the yield (May-June). A comparative evaluation of varieties on the content of sugars, acids, vitamin C in berries, taste and attractiveness of appearance is given. The dependence of the studied parameters on the genotype of the variety and vegetation conditions was established. Depending on the variety and year, the content of soluble solids varied from 7.2 to 10.2 %, with an average content of 8.9 %; total acidity varied from 0.8 to 1.2 %, with an average content of 1.0 %; the content of ascorbic acid (vitamin C) was from 45.1 to 78.5 mg/100 g, with an average content of 56.4 mg/100 g. Varieties with high parameters of tasting evaluation (Darenka, Kokinskaya Zarya, Studencheskaya), soluble solids (Rosinka, Studencheskaya) and ascorbic acid (Kokinskaya Zarya, Bereginya) were revealed. They are recommended to be grown to obtain fresh consumption products and as processing products of various directions. Bereginya, Darenka and Rosinka varieties surpass control varieties in certain biochemical parameters and can be used in breeding in the Urals region to obtain new genotypes with an increased content of a specific biologically active substance. The variety Tsaritsa is selected for high commodity qualities of berries (weight, dessert taste, attractiveness of appearance) and is recommended for commercial production of berries and involvement in breeding process. It has been established that the taste of berries is determined by a complex of acids, sugars and aromatic substances. This parameter was greatly influenced by weather conditions, from which air temperature and precipitations were determining.

scholarly journals Brockite in wallrock metasomatites of the Safyanovskoe copper-sulphide deposit (Middle Urals)

2020 ◽  
Vol 59 (3) ◽  
pp. 35-40
Author(s):  
Elena Industrovna SOROKA ◽  
◽  
Lyubov’ Vladimirovna LEONOVA ◽  
Mikhail Egorovich PRITCHIN ◽  
◽  
...  
Keyword(s):  
Rare Earth ◽  
South Urals ◽  
Middle Urals ◽  
Copper Sulphide ◽  
The Urals ◽  
Sulphide Deposit ◽  
Environment Change ◽  
Rare Earth Minerals ◽  
Composition Of Minerals ◽  
Academy Of Sciences

The relevance of the work is due to the need to study ore copper-sulphide deposits in the Urals. Purpose of the work: description of accessory brockite in metasomatites of the Safyanovskoe copper-sulphide deposit. Research methodology: the chemical composition of minerals was determined using the Jeol JSM-6390LV scanning electron microscope with an INCA Energy 450 X-Max 80 energy dispersive attachment from Oxford Instruments (Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences, Ekaterinburg). Results and conclusions. For the first time for the Safyanovskoe copper-sulphide deposit (Middle Urals), an aqueous rare earth phosphate of calcium and thorium, brockite, has been determined; it belongs to the group of rhabdophane (Ca,Th,REE)[PO]4 ∙ _H2 O. The mineral is rare for the Urals and was described earlier in granite pegmatites of the Middle and South Urals, as well as in dikes of metaplagiogranites of the Bazhenov ophiolite complex. Brockite was found in the rocky metasomatites of the Safyanovskoe copper-sulphide deposit after crystalline lithoclastic tuff (tuffaceous sandstone) of acid composition. The main mass of the rock consists of quartz, kaolinite (sericite), carbonates (dolomite, Fe-magnesite) with rare inclusions of pyrite. Brockite is found in the dolomite-quartz matrix of the sample in intergrowths with REE-goyazite – strontium aluminophosphate. It is assumed for the Safyanovskoe copper-sulphide deposit that an alumina association with an ore mineral association and rare earth minerals, in particular, REE-alumophosphates and phosphates, will form closely at the same time as the temperature drops and the redox conditions of the mineral formation environment change.

Character of the distribution and the form of finding platinum group elements in the chromitites of the Svetloborsky, Veresovoborsky and Kamenushensky clinopyroxenite-dunite intrusions (Middle Urals)

2018 ◽  
pp. 60-69
Author(s):  
S. Yu. Stepanov ◽  
R. S. Palamarchuk ◽  
D. A. Khanin ◽  
D. A. Varlamov ◽  
A. V. Antonov
Keyword(s):  
Structural Features ◽  
Platinum Group Elements ◽  
Uneven Distribution ◽  
Middle Urals ◽  
The Urals ◽  
The Middle Urals ◽  
Platinum Group

The note describes the mineralogical and geochemical features of platinum-bearing vein-disseminated and massive chromitite from the dunites of the Svetloborsky, Veresovoborsky and Kamenushensky clinopyroxenite-dunite intrusions located in the Middle Urals. It was found that platinum in chromitites has an extremely uneven distribution and is concentrated in the form of Pt-Fe intermetallides. The texture-structural features of the chromitites studied, the distribution of platinum group elements and the composition of chromoshpinelides in them are similar to the detailed study of the chromitites of the zonal clinopyroxenite-dunite intrusions of the Urals (Nizhnetagilsky) and Koryakia (Gal’moenan).

scholarly journals Late Pleistocene–Holocene ground surface heat flux changes reconstructed from borehole temperature data (the Urals, Russia)

2015 ◽  
Vol 11 (4) ◽  
pp. 647-652 ◽  
Author(s):  
D. Y. Demezhko ◽  
A. A. Gornostaeva
Keyword(s):  
Heat Flux ◽  
Surface Heat Flux ◽  
Ground Surface ◽  
Surface Heat ◽  
Middle Urals ◽  
The Urals ◽  
The Past ◽  
Carbon Dioxide Concentrations ◽  
Insolation Change ◽  
Borehole Temperature

Abstract. We use geothermal reconstruction of the ground surface temperature (GST) history early obtained in the Middle Urals to determine the surface heat flux (SHF) history over the past 35 kyr. A new algorithm of GST–SHF transformation was applied to solve this problem. The timescale of geothermal reconstructions has been corrected by comparing the estimated heat flux and annual insolation at the latitude of 60° N. The consistency of SHF and insolation changes on the interval 35–6 kyr BP with the linear correlation coefficient R = 0.99 points to orbital factors as the main cause of climatic changes during the Pleistocene–Holocene transition. The amplitude of SHF variations is about 1.3% of the insolation change amplitude. The increase of carbon dioxide concentrations lagged by 2–3 kyr from the SHF increase and occurred synchronously with GST changes.

scholarly journals Porfiry Afanasyevich Dibrova: at the origins of scientific pomiculture in the Urals

2021 ◽  
Vol 182 (2) ◽  
pp. 163-172
Author(s):  
T. N. Slepneva ◽  
A. V. Shlyavas
Keyword(s):  
Fruit Quality ◽  
Sour Cherry ◽  
Middle Urals ◽  
Biological Traits ◽  
Fruit Crops ◽  
The Urals ◽  
Black Currant ◽  
Berry Crops ◽  
Udmurt Republic ◽  
Standard Set

Porfiry Afanasyevich Dibrova was one of the first scientists and breeders standing at the origins of scientific pomiculture in the Urals. He was the author of 23 cultivars of apple, six of pear, one of sour cherry, and one of black currant. In the 1940s, he was the leader of collecting missions exploring the local assortment of fruit and berry crops in 50 districts of Sverdlovsk and Molotov (Perm) Provinces, and the Udmurt Republic. P.A. Dibrova was one of the authors of the first standard set of fruit and berry cultivars for the abovementioned areas. He studied regularities in the inheritance of valuable agronomic and biological traits of fruit crops and identified promising sources for apple and pear breeding. He launched the main plant breeding trends in the Middle Urals, now followed by contemporary breeders: the development of highly winter-hardy cultivars of apple and pear with fruiting precocity, stable yields, excellent fruit quality, and improved biochemical composition in fruits.

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