pdf № 276, December

DOI: 10.19110/2221-1381-2017-12-3-15

We confirmed the idea that the species belonged to three granitoid complexes of different age: Early Proterozoic Nikolaihsor, Middle-Late Riphean Kozhim (Manhambo) and Vendian-Early Cambrian Salner-Manhambo (Salner) based on the study of morphological features of zircons from granites of different massifs from the Northern Subpolar Urals and on the generation analysis data. They differ by the set of morphological types of zircons with specific genetic and generational characteristics and distribution of impurity elements.

The results of zircon study confirm geological data that the deepest rocks by crystallization conditions are Nikolaihsor complex granites, which are isofacial metamorphic rocks of amphibolite facies of moderate pressure, and less deep rocks — kozhim (Manhambo) complex granites, which formation level is determined by the thickness of enclosing puyvinskaya suite — about 1.5 km.

These data demonstrate wide possibilities of use of accessory zircon to solve problems of genesis, correlation and other problems of magmatic geology.

Keywords: Subpolar Urals, complex, massif, granite, zircon, morphotype, generation analysis.

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DOI: 10.19110/2221-1381-2017-12-16-24

The paper presents the results of U-Pb (SIMS) isotope dating of zircons from monzodiorite porphyries of the late dike phase of the Kongor Pluton (the Polar Urals), which is a petrotype pluton of the Kongor plutonic complex. The intrusive rocks studied were formed in the deeper parts of the Devonian Malyi Ural island arc and belong to the shoshonite-latite series. The calculated average concordant age of zircons is 395 ± 3 Ma, indicating that the completion of the formation of this pluton took place at the end of the early Devonian in late Emsian time. The obtained data are important for specification of an age of the Kongor complex, which for a long time has been the subject of discussions.

Keywords: Malyi Ural island arc, U-Pb geochronology, zircon, Devonian, Polar Ural, monzodiorites.

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DOI: 10.19110/2221-1381-2017-12-25-30

According to geological and geophysical data, the nodes of intersection of an interregional orthogonal faults system have been identified at the territory of the northeastern edge of Russian plate. The reconnaissance and detailed magnetometric works were carried out on the Frolovsk site. As a result of our investigations, three isolated local magnetic anomalies with an intensity of 15 nT and 200–450 m in dimensions were revealed. Anomalous objects are located in the depth of 50–100 m and represented as stock (tubes) of subvertical embedment. This region is anomalous by presence of non-rolled chromospinelides with an ideal octahedral habit. The first results of microprobe express analysis of chromospinelides indicate that the Cr₂O₃ content exceeds 64% in them.

Keywords: tectonics, fault zones, anomal magnetic field, local magnetic anomaly, metalgenius.

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DOI: 10.19110/2221-1381-2017-12-31-38

The Kamenushinsky Massif (the Middle Urals) of the dunite-clinopyroxenite-gabbro formation is one of the least studied massifs of the Platiniferous Belt of the Urals. This massif is characterized by the extensive distribution of dyke and vein bodies that are spatially tend to the fields of development of platinum mineralization. While, dyke and vein formations are poorly explored. The pecularities of the dyke bodies interrelations with dunites and clinopyroxenites that massif was composed of, as well as chromites that concentrate platinum mineralization could be used in studying of the geological evolution of the Kamenushinsky massif and its metallogeny. The obtained results are based on the data of microscopy and geological observations carried out during 2014—2017. For the first time complex characteristics of mineral-petrographic and geological-structural features of dyke and vein bodies of the Kamenushinsky massif are given.

Keywords: Platinum-bearing belt of the Urals, Kamenushinsky massif, dunite-clinopyroxenite-gabbro formation, dykes, veins, chromites, platinum mineralization.

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DOI: 10.19110/2221-1381-2017-12-39-41

The environment is adversely affected by various economic objects, but the largest contribution to its pollution is made by the oil industry. Today, for every 40 tons of oil produced, there are 1 ton of production waste that pollute land resources, subsoil, atmospheric air and adversely affect the work of personnel, create emergencies in oil fields. To ensure environmental safety when handling waste in the oil fields an effective waste management system, based on environmental legislation of the Russian Federation, is proposed (the Komi Republic).

Keywords: oil production, production waste, environmental impact, environmental safety, environmental legislation.

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