Russian Federation
Syktyvkar, Syktyvkar, Russian Federation
The typomorphic features and chemical composition of chromespinelides from the Quaternary aquatic sediments of the Keltmin Buried Canyon in the southeastern Komi Republic have been studied for the first time. It has been established that the chromespinelides are characterized by predominantly rounded and octahedral grain shapes with pronounced traces of mechanical surface wear and signs of corrosion. Chemically, the grain cores are composed predominantly of aluminochromites, chrompicotites, chromites, and subferrialuminochromites, while the outer rims are composed of more ferrous varieties (subferrichromites and subalumoferrichromites), indicating postmagmatic alteration of the chromespinelides. Microinclusions of chlorites, plagioclases, amphiboles, and pyroxenes have been detected. The study results indicate a connection between chromespinels and ultramafic rocks of the Alpine-type massifs of the Polar Urals. Their transport and redeposition in the aquatic formations of the Keltmin Trough are largely related to the exaration activity of the glacier. The obtained data are consistent with our previously published study of the composition of aquatic sediments of the buried canyon, which indicate the involvement of Ural igneous and metamorphic complexes in the formation of these sediments, as well as the possibility of the supply of detrital material to the Keltmin Trough from ophiolite association rocks of ultramafic massifs of the Polar and Subpolar Urals.
mineral composition, burial canyon, through valley, fluvioglacial deposits, alluvium, chromespinels, typomorphism, provenance source
1. Andreicheva L. N., Marchenko-Vagapova T. I., Buravskaya M. N., Golubeva Yu. V. Natural environment of the Neopleistocene and Holocene of the European North-East of Russia. Moscow: GEOS, 2015, 224 p. (in Russian)
2. Andreicheva L. N., Marchenko-Vagapova T. I., Isakov V. A. Structure, composition and conditions of formation of quaternary deposits in the Keltmin buried canyon (southeast of the Komi Republic). Vestnik of Geosciences, 2021, No. 5 (317), pp. 27—36. (in Russian)
3. Badida L. V., Maslov A. V., Mizens G. A. Reconstruction of the composition of rocks of feeder provinces. Article 3. Modern methods for studying heavy detrital minerals (garnets, tourmalines, chrome-spinelides, rutile, etc.). Lithosphere, 2020, V. 20, No. 2, pp. 149—167. (in Russian)
4. Vikulova M. F. General characteristics of clays. Methodological guide to petrographic-mineralogical study of clays. Moscow: Gosgeoltekhizdat, 1957, pp. 7—90. (in Russian)
5. Glukhov Yu. V., Makeev B. A., Varlamov D. A., Shevchuk S. S., Isaenko S. I. Chrome spinels with zinc-containing epigenetic rims from Devonian conglobreccia horizons of the Ichetyu placer occurrence (Middle Timan). Lithosphere, 2015, No. 2, pp. 103—120. (in Russian)
6. Glukhov Yu. V., Makeev B. A., Sokerin M. Yu. Typomorphism of chrome spinels from Holocene psephites of the Kyvvozh gold placer field (Volsko-Vymskaya ridge, Middle Timan). Vestnik of Geosciences, 2021, No. 8 (320), pp. 3—15. (in Russian)
7. State Geological Map of the Russian Federation. Scale 1:1000000 (third generation). Ural Series. Sheet P–40 — Northern Urals. Explanatory note. Saint Petersburg: VSEGEI Cartographic Factory, 2005, 332 p. (in Russian)
8. Kukharenko A. A. Mineralogy of placers. Moscow: State scientific and technical publishing house of literature on geology and subsoil conservation, 1961, 320 p. (in Russian)
9. Makeev A. B., Perevozchikov B. V., Afanasyev A. K. Chromite content of the Polar Urals. Syktyvkar: Komi branch of the USSR Academy of Sciences, 1985, 152 p. (in Russian)
10. Makeev A. B. Mineralogy of alpine-type ultrabasites of the Urals. St. Petersburg: Nauka, 1992, 197 p. (in Russian).
11. Makeev A. B., Brianchaninova N. I. Mineralogy, chromite and platinum content of the Polar Urals. Vestnik of the Institute of Geology Komi SC UB RAS. Syktyvkar: Geoprint, 1999, No. 6, pp. 20—24. (in Russian).
12. Nazarov N. N., Kopytov S. V., Zhuykova I. A., Chernov A. V. Pleistocene drainage channels in the southern part of the Keltminskaya trough (Kama-Vychegda interfluve). Geomorphology. 2020, No. 4, pp. 74—88. (in Russian)
13. Osovetskiy B. M. Typochemistry of placer minerals: Handbook. Perm: Perm University Press, 2001, 244 p. (in Russian)
14. Pavlov N. V. Chemical composition of chrome spinels in relation to the petrographic composition of ultrabasic intrusions. Proceedings of IGN, 103, 1949, 87 p. (in Russian)
15. Panin A. V., Zaretskaya N. E., Karpushina N. V., Kurbanov R. N., Modin I. N., Murray E. S. OSL chronology of the Keltmin paleovalley and the problem of overflow of Late Pleistocene ice-dammed lakes into the Caspian Sea. Abstracts of the reports of the All-Russian scientific conference (with international participation) "Geochronology of the Quaternary: instrumental methods for dating the latest deposits", dedicated to the 90th anniversary of the birth of L. D. Sulerzhitsky. Moscow: IG RAS, GIN RAS, 2019, pp. 66. (in Russian)
16. Yakovlev S. A. Fundamentals of the Geology of Quaternary Deposits of the Russian Plain (Stratigraphy). Moscow: Gosgeoltekhizdat, 1956, 314 p. (in Russian).
17. Panin A., Astakhov V., Komatsu G., Lotsari E., Lang J., Winsemann J. Middle and Late Quaternary glacial lake-outburst floods, drainage diversions and reorganization of fluvial systems in northwestern Eurasia // Earth-Science Reviews. 2020. Vol. 201. P. 103069. DOI:https://doi.org/10.1016/j.earscirev.2019.103069
