scholarly journals ON THE HISTORY OF THE FORMATION OF THE TASH-YARSKY PYRITE-POLYMETALLIC DEPOSIT (SOUTH URALS)

2021 ◽  
Author(s):  
V.I. Snachev ◽  
Keyword(s):  
Temperature Dependence ◽  
High Temperatures ◽  
Iron Content ◽  
Transformation Temperature ◽  
Geological Structure ◽  
South Urals ◽  
Granite Massif ◽  
Polymetallic Deposit ◽  
History Of ◽  
Petrographic Study

The article considers the geological structure of the Tash-Yarsky pyritepolymetallic deposit located in the northern part of the Magnitogorsky megazone near the large (about 300 km2) Akhunovsky granite massif. The petrographic study of the hornfelses made it possible to identify a number of mineral parageneses containing cordierite, garnet, and biotite, which are installed respectively from the massif contact at a distance no further than 0,6–0,8; 1,2–1,5 and 2,3–2,5 km. Based on the temperature dependence of the maximum iron content of sphalerite, high temperatures of metamorphism (500–610 °С) were obtained for ores. According to garnet-biotite and garnet-cordierite thermobarometers for rocks close to the massif, the transformation temperature is 720–750 °С, and the pressure is 8,9–9,1 kbar. With a distance of 700–850 m from the contact of granitoids, the temperature does not exceed 620–640 °C, and the pressure is 5,3–5,4 kbar; at a distance of 1,3 km, respectively — 550–560 °C and 4,6–4,7 kbar.

THE HISTORY OF CATHOLICISM IN BASHKORTOSTAN: A BRIEF HISTORIOGRAPHIC OVERVIEW

2020 ◽  
Vol 0 (4) ◽  
pp. 89-95
Author(s):  
F.A. KRYZHANOVSKY ◽  
Keyword(s):  
Catholic Church ◽  
Social Stratification ◽  
Western Europe ◽  
Forced Migration ◽  
Religious Community ◽  
General Nature ◽  
South Urals ◽  
The South ◽  
Middle Volga Region ◽  
History Of

The article examines the main publications covering the centuries-old history of the Catholic Church in the lands of modern Bashkortostan, as well as partly affecting the interaction of local Catholic communities with coreligionists from other cities located in the South Urals, as well as in the Middle Volga region. Unfortunately, there are quite a few special studies on the history of this Christian denomination in our republic. Many works, in one way or another related to this issue, are of a general nature and contain a schematic listing of factual information, or are more devoted to the history of national communities, for which this religion is, to a certain extent, one of the most important elements of traditional ethnic culture. Here it is necessary to note, first of all, publications on the history of the Polish and German diaspora, which provide information about the participation of representatives of these communities in the creation of Catholic parishes and public associations associated with charity and education. At the same time, the significance of the confessional aspect is to a much lesser extent revealed in works on the history of Latvian immigrants from Latgale, Belarusians and Ukrainians from Volyn and Eastern Galicia, who, due to various circumstances, left their homes during the First World War, as well as other Catholic emigrants from Central and Western Europe, located in the Ufa province at the beginning of the XX century. In some articles on demography and striking features of social stratification, one can find indirect references to the presence of Catholics, but this information only It is noteworthy that most publications indicate the middle of the 17th century as the earliest dating of the appearance of believing Catholics in the South Urals, and evidence of missionary trips to the Eastern Hungarians during the 13th-15th centuries allows us to make hypothetical assumptions about their role in the life of the local religious community. It can be noted that the presence of a certain part of Catholics on the territory of Bashkiria during the 16th20th centuries. was associated with forced migration due to the fact that, as a result of military clashes, some of them were captured, as well as due to participation in activities that conflicted with the interests of the Russian leadership are considered, with a few exceptions, only in the context of the problem of the origin of the Bashkir people, most likely due to the modest results of the preaching.

MANTLE-LITHOSPHERE INTERACTION PROCESSES AND THEIR INFLUENCE ON FLOOD BASALT PROVINCES: PLUME-THEORY AND ALTERNATIVE MODELS

2020 ◽  
Vol 42 (4) ◽  
pp. 433-442
Author(s):  
Anatoly KUDRYAVTSEV ◽  
Keyword(s):  
Flood Basalt ◽  
Geological Structure ◽  
Mantle Lithosphere ◽  
Development Study ◽  
Alternative Models ◽  
History Of Development ◽  
Interaction Processes ◽  
History Of ◽  
Plume Tectonics ◽  
Tectonic Interpretation

Different geotectonic hypotheses with respect to flood basalt provinces formation interpretation were analysed. Geotectonic models are proposed to unite in two groups: II. Traditional: plume-tectonic interpretation; I. Alternative models: delamination hypothesis and others.The flood basalt provinces properties (geological structure, history of development) study permits finding the best mantle-lithosphere interaction model.Keywords: flood basalt provinces, plume-tectonics, magmatism.

scholarly journals Samarskite-(Y) YFe3+Nb2O8: the history of discovery and studies of the first niobate with a double wolframite structure

2020 ◽  
pp. 27-37
Author(s):  
S.N. Britvin ◽  
I.V. Pekov ◽  
M.G. Krzhizhanovskaya ◽  
A.A. Agakhanov ◽  
B. Ternes ◽  
...  
Keyword(s):  
Crystal Structure ◽  
South Urals ◽  
Chemical Formula ◽  
History Of ◽  
The Moment

The article describes a history of studies of samarskite-(Y), YFe3+Nb2O8, from its discovery in the Ilmeny Mountains (South Urals) in 1839 to the moment of the solution of its crystal structure and refnement of chemical formula in 2019.

scholarly journals Geological Structure Bogdoulinsky Granite Massif (Mongolia)

2019 ◽  
Vol 27 ◽  
pp. 122-137
Author(s):  
E. Kh. Turutanov ◽  
◽  
B. Buyantogtokh ◽  
B. Tengis ◽  
◽  
...  
Keyword(s):  
Geological Structure ◽  
Granite Massif

Deformation and its Structure in Llo Ti-Al-Nb Compound Alloys

1988 ◽  
Vol 133 ◽  
Author(s):  
Yoo-Dong Hahn ◽  
Sung H. Whang
Keyword(s):  
Temperature Dependence ◽  
Yield Stress ◽  
Uniaxial Compression ◽  
High Temperatures ◽  
Room Temperature ◽  
Fracture Strain ◽  
Positive Temperature ◽  
Deformation Structures ◽  
Miniature Specimens ◽  
Deformation Tests

ABSTRACTThe ternary TiAl-Nb (Llo) alloys stabilized at 1000°C for a week were prepared into miniature specimens for compressive deformation tests. The specimens were deformed in uniaxial compression at room temperature as well as various high temperatures. The yield stress and fracture strain were determined with respect to Nb concentration, and as a function of temperature to investigate positive temperature dependence.Dislocation structures and other deformation structures of the deformed alloys were studied by TEM.

The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia. Part I. New gatelite-group minerals ferriperbøeite-(La), (CaLa3)(Fe3+Al2Fe2+)[Si2O7][SiO4]3O(OH)2 and perbøeite-(La), (CaLa3)(Al3Fe2+)[Si2O7][SiO4]3O(OH)2

2020 ◽  
Vol 84 (4) ◽  
pp. 593-607 ◽  
Author(s):  
Anatoly V. Kasatkin ◽  
Natalia V. Zubkova ◽  
Igor V. Pekov ◽  
Nikita V. Chukanov ◽  
Radek Škoda ◽  
...  
Keyword(s):  
Rare Earth ◽  
Single Crystal ◽  
Electron Microprobe ◽  
Earth Element ◽  
South Urals ◽  
Charge Balance ◽  
Unit Cell Parameters ◽  
Cell Parameters ◽  
History Of ◽  
Brownish Black

AbstractThe paper opens a series devoted to the mineral diversity of the Mochalin Log rare earth element (REE) deposit, South Urals, Russia. There is a brief outline of the history of studies and geology of the deposit as well as the description of two new isostructural gatelite-group minerals, ferriperbøeite-(La) (CaLa3)(Fe3+Al2Fe2+)[Si2O7][SiO4]3O(OH)2 and perbøeite-(La) (CaLa3)(Al3Fe2+)[Si2O7][SiO4]3O(OH)2. Both minerals occur in polymineralic nodules and are associated with one another and allanite-(Ce), allanite-(La), bastnäsite-(Ce), bastnäsite-(La), ferriallanite-(Ce), ferriallanite-(La), ferriperbøeite-(Ce), perbøeite-(Ce), törnebohmite-(Ce) and törnebohmite-(La). The new minerals form isolated anhedral grains up to 0.3 mm [ferriperbøeite-(La)] and 0.5 mm [perbøeite-(La)] across and granular aggregates up to 1.5 mm × 0.5 mm [ferriperbøeite-(La)] and 3 mm × 1 mm [perbøeite-(La)]. Both minerals are brownish-black with vitreous lustre. Dcalc = 4.510 [ferriperbøeite-(La)] and 4.483 [perbøeite-(La)] g cm–3. They are optically biaxial (+); ferriperbøeite-(La): α = 1.788(5), β = 1.790(5), γ = 1.810(5) and 2Vmeas = 40(10)°; perbøeite-(La): α = 1.778(8), β = 1.783(8), γ = 1.805(8) and 2Vmeas = 40(10)°. Chemical data [wt.%, electron-microprobe; Fe3+:Fe2+ ratio from charge-balance requirements, H2O by stoichiometry; ferriperbøeite-(La)/perbøeite-(La)] are: CaO 4.91/4.81, ThO2 0.00/0.32, La2O3 23.75/22.16, Ce2O3 19.69/20.05, Pr2O3 0.85/1.09, Nd2O3 1.48/2.18, MgO 1.47/1.38, Al2O3 10.68/11.25, MnO 1.07/0.92, FeO 3.04/3.35, Fe2O3 5.31/3.78, TiO2 0.19/0.19, SiO2 27.47/27.35, F 0.11/0.23, H2O 1.61/1.54, –O = F –0.05/–0.10, total 101.58/100.50. The empirical formulae based on O20(OH,F)2 are for ferriperbøeite-(La): (Ca0.95La1.58Ce1.30Nd0.10Pr0.06)Σ3.99(Al2.27Fe3+0.72Fe2+0.46Mg0.40Mn0.16Ti0.03)Σ4.04Si4.96O20[(OH)1.94F0.06]; and for perbøeite-(La): (Ca0.94Th0.01La1.49Ce1.34Nd0.14Pr0.07)Σ3.99(Al2.42Fe3+0.52Fe2+0.51Mg0.38Mn0.14 Ti0.03)Σ4.00Si4.99O20[(OH)1.87F0.13]. Both minerals are monoclinic, P21/m; the unit-cell parameters [ferriperbøeite-(La)/perbøeite-(La)] are: a = 8.9458(2)/8.9652(4), b = 5.72971(13)/5.7306(2), c = 17.6192(3)/17.6770(9) Å, β = 115.9497(19)/116.053(6)°, V = 812.06(3)/815.88(6) Å3 and Z = 2/2. The crystal structures are solved on a single crystal and converged to R = 0.0355 [ferriperbøeite-(La)] and 0.0750 [perbøeite-(La)]. Ferriperbøeite-(La) and perbøeite-(La) are named as the La-analogues of ferriperbøeite-(Ce) and perbøeite-(Ce), respectively.

THE EARLY AND MIDDLE BRONZE AGE SETTLEMENT AT KOIMISIS, THERASIA: PERIODS OF HABITATION AND ARCHITECTURE

2020 ◽  
Vol 115 ◽  
pp. 105-132
Author(s):  
Kostas Sbonias ◽  
Iris Tzachili ◽  
Maya Efstathiou ◽  
Clairy Palyvou ◽  
Costas Athanasiou ◽  
...  
Keyword(s):  
Bronze Age ◽  
Volcanic Eruptions ◽  
Geological Structure ◽  
Archaeological Investigation ◽  
New Information ◽  
Surface Survey ◽  
History Of ◽  
Geophysical Investigations ◽  
Middle Bronze Age ◽  
Early Phases

The study of the history of the first excavations on prehistoric Therasia in the nineteenth century, which were carried out in the context of contemporary scientific interest in the volcanic eruptions of Santorini, has led to the systematic archaeological investigation of the island from 2007 onwards. The intensive archaeological surface survey, the geological survey of the geological structure and palaeotopography of Therasia, and geophysical investigations, undertaken in conjunction with the ongoing excavation of the prehistoric settlement at the site of Panaghia Koimisis at the southern end of modern Therasia, have created the conditions for a more comprehensive approach to the archaeological landscape of the island. Based on the results from the excavation trenches in the south and south-east terraces of the Koimisis hill, which have been excavated down to the virgin soil, we present findings on the organisation, architecture and habitation phases of the Koimisis settlement. The site emerges as an important settlement located on the imposing hilltop rising on the west side of the pre-eruption Santorini caldera in the Early Bronze Age, with a long period of habitation to the end of the Middle Cycladic period, when it was definitively abandoned. The excavation of the settlement provides new information on its architecture and spatial organisation during the Early and Middle Bronze Age, completing the picture from Akrotiri, whose early phases are preserved in a piecemeal fashion under the buildings of the Late Cycladic town.

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