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- W113516244 abstract "All researchers recognize the important implication of faulting for the geological setting of the Pechenga region. These were studied in most detail in the Pechenga ore field. According to Gorbunov et al. (1978), the geological structure of the Pechenga ore field was formed in five stages. During the first stage basic effusive rocks were erupted and gabbro-diabased sills intruded. The second stage is notable for the formation of an asymmetric synclinorium, which originated as a result of the Karel folding in conditions of compressive stresses acting in the direction from east to west; during this stage poorly mineralized basic and ultra-basic intrusions were injected. The third stage is characterized by changes in direction of the compression stresses, the appearance of transverse folds and associated ore-bearing intrusions, and copper-nickel deposits. During the fourth stage enclosing rocks and ores were subject to metamorphism under conditions of brittle deformation. During the fifth stage ore bodies were displaced along faults and formed gouges. The so-called Main Tectonic Zone, which occurs inside the Zhdanov suite and extends both parallel and at an acute angle to the layering of the volcano-sedimentary rocks, played an important role in the localization of the nickeliferous basic-ultrabasic intrusions. It is assumed that ore-bearing intrusions have penetrated into this zone along the Portyitash and Luostari major faults. Recurrent tectonic movements along this zone were accompanied by the displacement of sulphide masses which were brought into underlying rocks, by the formation of late hydrothermal mineral assemblages and by the intensive effect of metamorphic processes." @default.
- W113516244 created "2016-06-24" @default.
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- W113516244 date "1987-01-01" @default.
- W113516244 modified "2023-09-23" @default.
- W113516244 title "Shear Zones and Mineralized Fissures" @default.
- W113516244 doi "https://doi.org/10.1007/978-3-642-71137-4_8" @default.
- W113516244 hasPublicationYear "1987" @default.
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