pdf № 268, April

DOI: 10.19110/2221-1381-2017-4-3-11

The paper were shows the results of the study of various types of amphibolites joint within “ilmenskaya series” of the ilmenogorsky complex (South Urals). This “series” is build up of amphibolites (up to 80 % of the total), biotite plagiogneiss, garnet-biotite rocks, diopside-scapolite rocks, granites dike and pegmatite of varying thickness. “Ilmenskaya series” is the important structural parts of the ilmenogorsky complex. The mineral composition of amphibolites were studied, features of composition of the major and minor rock-forming minerals (amphibole, pyroxene, plagioclase, mica and etc.) were analyzed. Amphibolites were separated for several groups: with and without piroxenes.

Keywords: ilmenogorsky complex, ilmenskaya series, amphibolites, composition of the major rock-forming minerals.

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DOI: 10.19110/2221-1381-2017-4-12-15

The crystals of zircon can reveal information about their formation environment due to their resistance to external influence and also inclusions observed of them. Zircon can contain different mineral inclusions: biotite, plagioclase, quartz, аpatite, etc. However no information about gold inclusions has been available in the zircons from granites of the Sudpolar Urals. The study results of the inclusions of gold in accessory zircon of the Kozhim granitic massif are presented in this paper. The studied mineral is a dark-brown translucent short-prismatic crystal containing an inclusion of gold and nodules of quartz. According to our studies, the inclusion of gold formed during the growth of zircon and it is gold covered with a thin film of oxide gold. It was confirmed that the crystallization of the studied zircon occurred at a temperature of 800 °С and above at the stage of formation of granites of Kozhim massif. We suggested the presence of an additional temperature mode when the temperature decreased to 700 °C and below during the postmagmatic stage.

Keywords: accessory zircon, granite, inclusion, gold, the Kozhim massif, the Subpolar Urals.

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DOI: 10.19110/2221-1381-2017-4-16-23

A number of outcrops located in the basin of the Bol'shaya Nadota River (Subpolar Urals) supply a unique possibility to study the Middle Palaeozoic isolated carbonate platform and to reconstruct its composition and development.

The Middle Devonian — Lower Carboniferous sequence of the region is represented by the Middle Devonian Nadotamylk Formation composed of argillites and siltstones overlaid by clayey carbonates, the Frasnian Matyashor Formation composed of detritic and organogenous limestones, the Famennian-Tournaisian (?) Bolshaya Nadota Formation comprising oolitic limestones, Izvestnyakovo-Dolomitovaya and Izvestnyakovo-Brtekchevaya formations of the Late Visean — Serpukhovian age composed of detritic, clastic, and oolitic limestones, and the Olysya Reef of the Late Visean — Serpukhovian age.

 Three facies belts possessing different evolution of the sedimentation are detected in the area under consideration. The Eastern and Central facial belts are dominated by organogenous buildups, and the detritic and oolitic limestones are characteristic for the Western facial belt. These facies compose the Bol'shaya Nadota shoal (isolated carbonate platform) similar to Great Bahamas Bank.

Elaborated models of evolution of sedimentation reflect development of buildups and surrounding areas in the Early Frasnian — Serpukhovian time. Composition of the Bol'shaya Nadota shoal and distribution of biota suggest a warm-water environment for the isolated carbonate platform.

Keywords: Subpolar Urals, Devonian, Lower Carboniferous, Bol'shaya Nadota Carbonate Complex, sedimentation models, isolated carbonate platform.

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DOI: 10.19110/2221-1381-2017-4-24-28

National economy development requires an increase of metallurgical production accompanied by technogenic mineral matter characterized by heterogeneous phase composition and structure.

The aim of this study is a comprehensive mineralogical investigation of blast furnace slags produced by OJSC «MMK» for prognoses of possibility and areas of their utilization. We implemented a complex of modern mineralogical-analytical methods.

These blast furnace slags have porous structure of porphyry, intersertal and spherulite type. The main slag-forming minerals are akermanite, pseudowollastonite (79—94 %), secondary — fayalite, diopside, oldhamite, perovskite, jacobsite, bixbyite, ferrite (3 %). The amorphous component of slags does not exceed 18 %.

Keywords: blast furnace slag, industrial raw materials, processing, laboratory study, mineral composition, structure, akermanite, pseudowollastonite.

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DOI: 10.19110/2221-1381-2017-4-29-36

The actual task is to unite the efforts of scientists from different countries to find efficient sorbing materials and develop technologies for their production for purification of water systems, technogenic structures from radionuclides, heavy metals and other contaminants. The objects of the research are red mud (RM) from Ural aluminum plant and clay-salt slimes (CSS) from the 3rd mining factory of JSC «Belaruskali», which were studied by modern analytical methods. We estimated the application potential of the industrial wastes of bauxite processing (Russia) and sylvinite ore (Belarus) accumulated at enterprises of mining industry of these countries, in the technologies of rehabilitation of disturbed agroecosystem and purification of water environments and ecosystems from radionuclides.

Keywords: red mud, clay-salt slimes, physical and chemical properties, sorption, radioactive contamination, uranium, radium, thorium, radiocesium.

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DOI: 10.19110/2221-1381-2017-4-37-42

The study of the histology of the Late Devonian and Early Carboniferous conodont elements allows characterizing the main types of hard tissues, composing a conodont element crown: lamellar, paralamellar, interlamellar, and albid. Significant differences between texture and composition of the conodont hard tissues and those of Vertebrata are detected. Some similarities observed in the structures of the conodont and vertebrate mineralized tissues may be caused by similar process of biomineralization, not by synplesiomorphy.

Keywords: Conodonta, histology, hard tissues, Late Devonian, Early Carboniferous, Vertebrata.

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