Structural and Petrological Evolution of the Snezhnaya Gabbro-Syenite Massif (Southern Baikal Region)

Authors

S.N. Kovalenko¹, S.V. Rasskazov^1,2, M.I. Grudinin¹

¹Irkutsk State University, Irkutsk, Russia

²Institute of the Earth's Crust SB RAS, Irkutsk, Russia

About the Authors

Kovalenko Sergey Nikolaevich,

Candidate of Geological and Mineralogical Sciences,

664003 Irkutsk, Lenin str., 3,

Irkutsk State University, Faculty of Geology,

Associate Professor of the Department of Dynamic Geology,

tel.: (3952)20-16-39,

email: igpug@mail.ru.

Rasskazov Sergei Vasilievich,

doctor of geological and mineralogical sciences, professor,

664003 Irkutsk, st. Lenina, 3,

Irkutsk State University, Faculty of Geology,

Head of the Department of Dynamic Geology,

664033 Irkutsk, st. Lermontova, 128,

Institute of the Earth's Crust SB RAS,

Head of the Laboratory of Isotopy and Geochronology,

tel.: (3952) 51–16–59,

email: rassk@crust.irk.ru.

Grudinin Methodius Ivanovich,

Doctor of Geological and Mineralogical Sciences,

664003 Irkutsk, Lenin str., 3,

Irkutsk State University, Faculty of Geology,

Professor of the Departments of Dynamic Geology,

tel. (3952) 20–16–39.

Abstract. The article deals with the structural and petrological evolution of one of the many gabbroid massifs of the Southern Baikal region - Snezhninsky, located near the river of the same name, characterized by the most typical structural and metamorphic paragenesis: comfort with layering of containing rocks, located in a steep twisted wing of asymmetrical folds of latitudinal extension with horizontal hinges and axial planes inclined to the north. the array is complicated by a longitudinal oblique upsurge with a powerful zone of tectonites. The northwestern end of the massif is complicated by the upsurge of the northeastern extension. To a depth, the massif sinks to 4-5 km and there is cut off by another fault of the northwestern extension. The internal structure of the array is characterized by a rather monotonous development of small structural forms: the structures of the magma flow, emphasized by the elongation of flat xenoliths, the asymmetrical folds of the right pattern in the plan, the gradual intertransitions between all varieties of rocks composing the array, indicating a significant warming of all rocks during their formation and assimilation.

Keywords: gabbroid array, asymmetric folds, tectonites, faults, structural and petrological evolution.

P. 20–29

References

Grudinin M.I. Rannpaleozoic gabbro-sienite Snezhnin massif of the South-Western Baikal region / M.I. Grudinin, S.V. Rasskazov, S.N. Kovalenko, A.M. Ilyasova // Geology and geophysics.– 2004.- V. 45, No. 9.– P. 1092–1101.

Slyudyansky crystalline complex / E.P. Vasiliev, L.Z. Reznitsky, V.N. Vishnyakov, E.A. Nekrasova.– Novosibirsk: Nauka, 1981.– 197 p.

Shafeev A.A. Dokembrian Yugo-Zapadnogo Pribaikalya i Khamar-Dabana.– M.: Nauka, 1970.– 179 p.

For citation

Kovalenko S.N. Structural and Petrological Evolution of the Snezhnaya Gabbro-Syenite Massif (Southern Baikal Region) [Electronic resource] / S.N. Kovalenko, S.V. Rasskazov, M.I. Grudinin // Geology and Environment.— 2022.— Т. 2, No. 3.— P. 20–29. DOI 10.26516/2541-9641.2022.3.20
Access Mode: http://geoenvir.ru/archive/g&e22-2-3/kovalenko22-3.htm (30.09.2022).

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