Source of trachydacite-rhyolite pebbles of Middle Jurassic conglomerates on the northwestern shore of Lake Baikal: comparison of the pebbles with rocks of Upper Paleozoic and Mesozoic igneous complexes from Transbaikalia

Authors

R.V. Oliferovsky¹, E.A. Sedunova¹, I.B. Shametova¹, A.V. Bashkirtsev¹, D.A. Danilin¹, A.R. Mongush¹, S.N. Kovalenko¹, T.A. Yasnygina², I.S. Chuvashova^1,2, E.V. Saranina², S.V. Rasskazov^1,2

¹Irkutsk State University, Irkutsk, Russia

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

About the Authors

Oliferovskiy Ruvim Vladimirovich, 664003 Irkutsk, st. Lenina, 3, Irkutsk State University, Faculty of Geology, undergraduate student of the second course, tel.: 89086449916, еmail: olif2018@yandex.ru.

Sedunova Elizaveta Andreevna, 664003 Irkutsk, st. Lenina, 3, Irkutsk State University, Faculty of Geology, undergraduate student of the second course, tel.: 89149559277, еmail: liza.sedunowa2017@yandex.ru.

Shametova Indira Batoevna, 664003 Irkutsk, st. Lenina, 3, Irkutsk State University, Faculty of Geology, undergraduate student of the second course, tel.: 89245493435, еmail: shametova-22@mail.ru.

Bashkirtsev Alexey Viktorovich, 664003 Irkutsk, st. Lenina, 3, Irkutsk State University, Faculty of Geology, undergraduate student of the second course, tel.: 89149384547, еmail: lesha.bashkirtsev@mail.ru.

Danilin Dmitriy Andreevich, 664003 Irkutsk, st. Lenina, 3, Irkutsk State University, Faculty of Geology, undergraduate student of the second course, tel.: 89086615699, еmail: tmitrich20@gmail.com.

Mongush Alsu Rakhmetovna, 664003 Irkutsk, st. Lenina, 3, Irkutsk State University, Faculty of Geology, undergraduate student of the first course, tel.: 89842769474, еmail: alsumongush@mail.ru.

Kovalenko Sergey Nikolaevich, Candidate of Geological and Mineralogical Sciences, 664003 Irkutsk, Lenin str., 3, Irkutsk State University, Faculty of Geology, Associate Professor of the Dynamic Geology chair, tel.: (3952)20-16-39, еmail: igpug@mail.ru.

Yasnygina Tatyana Alexandrovna, candidate of geological and mineralogical sciences, 664033 Irkutsk, st. Lermontova, 128, Institute of the Earth's Crust SB RAS, Senior Researcher, tel.: (3952) 51–16–59, еmail: ty@crust.irk.ru.

Chuvashova Irina Sergeevna, candidate of geological and mineralogical sciences, 664003 Irkutsk, st. Lenina, 3, Irkutsk State University, Faculty of Geology, Associate Professor of the Dynamic Geology chair, 664033 Irkutsk, st. Lermontova, 128, Institute of the Earth's Crust SB RAS, Senior Researcher, tel.: (3952) 51–16–59, еmail: chuvashova@crust.irk.ru.

Saranina Elena Vladimirovna, candidate of geological and mineralogical sciences, 664033 Irkutsk, st. Lermontova, 128, Institute of the Earth's Crust SB RAS, Lead Engineer, 664033 Irkutsk, st. Favorskogo, 1 "A", A.P. Vinogradov Institute of Geochemistry SB RAS, еmail: e_v_sar@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 Dynamic Geology Chair, 664033 Irkutsk, st. Lermontova, 128, Institute of the Earth's Crust SB RAS, Head of the Laboratory for Isotopic and Geochronological Studies, tel.: (3952) 51–16–59, еmail: rassk@crust.irk.ru.

Abstract. From paleontological data, conglomerates exposed on the northwestern shore of Lake Baikal, in the Bolshiye Koty and Listvyanka areas, belongs to the upper part of the section of the southeastern part of the Irkutsk coal-bearing basin (Angara-Koty depression) and is considered as part of the lower subformation of the Koty Formation dated back to the upper part of the Aalenian Stage of the Middle Jurassic (174–170 Ma). To identify a source of clastic material of the conglomerates, petrogenic oxides and trace elements of pebbles of volcanic rocks are determined and thin sections are examined. Defined are five groups of trachydacite-rhyolite pebbles of plumasite composition in the former outcrop and a group similar in composition to the main Bolshiye Koty group in the second one. The difference between the pebbles of conglomerates from the upper part of the section in the Angara-Koty depression and those of alkaline effusives of acidic and intermediate composition from the lower and middle parts of the section is indicated. It is assumed that the composition of the pebbles of the Upper Koty subformation is similar to that of the Middle Jurassic volcanic and subvolcanic rocks from Transbaikalia. Their origin from three sources is possible: 1) from nearest one – an unknown Middle Jurassic volcano buried under Cenozoic sedimentary stratum of the South Baikal basin, in the suture zone of the Siberian paleocontinent, 2) from the middle-remote one (distance over 250–500 km) – Middle Jurassic volcano-plutonic complexes of the Dzhida-Vitim fault zone, and 3) from the more remote one – the Mongolian-Okhotsk fault zone.

Keywords: Irkutsk coal-bearing basin, Baikal, Transbaikalia, Jurassic, Aalenian stage, rhyolite, trachydacite, agpaitic rocks, plumasitic rocks.

P. 53–79

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For citation

Oliferovsky R.V. Source of trachydacite-rhyolite pebbles of Middle Jurassic conglomerates on the northwestern shore of Lake Baikal: comparison of the pebbles with rocks of Upper Paleozoic and Mesozoic igneous complexes from Transbaikalia [Electronic resource] / R.V. Oliferovsky, E.A. Sedunova, I.B. Shametova, A.V. Bashkirtsev, D.A. Danilin, A.R. Mongush, S.N. Kovalenko, T.A. Yasnygina, I.S. Chuvashova, E.V. Saranina, S.V. Rasskazov // Geology and Environment.— 2022.— V. 2, No. 4.— P. 53–79. https://doi.org/10.26516/2541-9641.2022.4.53
Access Mode: http://geoenvir.ru/archive/g&e22-2-4/oliferovsky22-4.htm (30.12.2022).

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