Abstract
Relevance of the work. Comprehensive studies of the geology of the Arctic part of Western Siberia are very important for the search for oil and gas in this vast but understudied territory. At present, unfortunately, we know little about the geological structure of the Arctic in the region of Western Siberia, where the sedimentary cover is mainly investigated (the thickness of which is about 3–4 km) and only a few wells are drilled to the foundation. Therefore, a comprehensive study of core samples from this little-studied territory seems extremely relevant. The purpose of the work is a detailed description of the mineralogy and petro-geochemical features of garnetquartz-chlorite-muscovite schists from the well Verkhnerechenskaya no. 2 from the foundation Arctic part of the West Siberian megasbasin. Scope of application of work. This work can be useful in constructing geological maps of the pre-Jurassic foundation of the Yamal Peninsula. Results of work and conclusions. Mineralogy has been studied in detail and the trace element composition of garnetquartz-chlorite-muscovite schists is obtained. The mineral composition of the rocks is as follows: almandine, muscovite, quartz, chamosite, calcite, albite, rutile, titanite, fluorapatite, zircon, xenotime-(Y) and pyrite. The progressive zonality in the almandine is determined, which is confirmed by the calculated data of metapelite formation temperature, progressive metamorphism. Distribution of rare, scattered and REE in the studied rocks is characteristic of metamorphic schists from the foundation of the Urals part of the West Siberian megasbasin, which compel the framing of monzodiorite-granite massifs of Shaimsko-Kuznetsov meganticlinorium of Western Siberia. Probably, the metapelites studied are the result of warming up the thickness of sedimentary rocks with granite intrusion located in the vicinity of Verkhnerechenskaya area. Later, the rocks underwent propylitization with the formation of secondary carbonate and pyrite.
Highlights
Comprehensive studies of the geology of the Arctic part of Western Siberia are very important for the search for oil and gas in this vast but understudied territory
To the north of the Verkhnerechenskaya area, in the Zapadno-Yarotinskaya area in the pre-Jurassic basement, metamorphic schists were drilled, which we consider as the northern framing of the Verkhnerechenskaya granite pluton [5], the age of which is determined by accessory zircons and monazite, and corresponds to the Late Permian (254–256 Ma) [4, 6] The schists have p123v@yandex.ru https://orcid.org/0000-0002-1651-1281
Особенности состава метапелитов из фундамента Арктической части Западно-Сибирского мегабассейна (Верхнереченская разведочная площадь, полуостров Ямал)//Известия УГГУ. 2021
Summary
Comprehensive studies of the geology of the Arctic part of Western Siberia are very important for the search for oil and gas in this vast but understudied territory. Within the territory of the Yamal Peninsula, the foundation rock complexes were opened with wells within Bovanenkovskaya, Novoportovskaya, Verkhnerechenskaya and Syunai-Salinskaya exploration areas. Verkhnerechenskaya area is located in the southern part of the Yamal Peninsula, near the Novoportovsky oil and gas field. 3 at a depth of 1730–1827 m exposed granites but sheeted ones [4]. 2 was drilled, in which metamorphic rocks, garnet-quartz-chlorite-mica composition were exposed in depth range 2480–2600 m To the north of the Verkhnerechenskaya area, in the Zapadno-Yarotinskaya area in the pre-Jurassic basement, metamorphic schists were drilled, which we consider as the northern framing of the Verkhnerechenskaya granite pluton [5], the age of which is determined by accessory zircons and monazite, and corresponds to the Late Permian (254–256 Ma) [4, 6] The schists have
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