A.R. Mongush1, A.A. Bokareva1, A.N. Podlinov1,2, V.V. Prokopchik1, V.S. Ritter1, N.M. Maksimov1, V.S. Kalinin1, M.S. Zaripov1, S.A. Dambaev1, S.N. Kovalenko1, T.A. Yasnygina2, I.S. Chuvashova1,2, E.V. Saranina2,3, S.V. Rasskazov1,2
1Irkutsk State University, Irkutsk, Russia
2Institute of the Earth's Crust SB RAS, Irkutsk, Russia
3A.P. Vinogradov Institute of Geochemistry SB RAS, Irkutsk, Russia
Mongush Alsu Rakhmetovna,
664025 Irkutsk, st. Lenina, 3,
Irkutsk State University, Faculty of Geology,
undergraduate student of the second course
email: alsumongush@mail.ru.
Bokareva Anastasiya Akexandrovna,
664025 Irkutsk, st. Lenina, 3,
Irkutsk State University, Faculty of Geology,
undergraduate student of the second course,
email: nastiita@rambler.ru.
Podlinov Alexey Nikolaevich,
664025 Irkutsk, st. Lenina, 3,
Irkutsk State University, Faculty of Geology,
undergraduate student of the second course,
email: podlinov8@mail.ru.
Prokopchik Vladimir Vladimirovich,
664025 Irkutsk, st. Lenina, 3,
Irkutsk State University, Faculty of Geology,
undergraduate student of the second course,
email: prokopchk3829@mail.ru.
Ritter Vladislav Stanislavovich,
664003 Irkutsk, st. Lenina, 3,
Irkutsk State University, Faculty of Geology,
undergraduate student of the second course,
email: vlad.ritter00@mail.ru.
Maksimov Nikita Mikhailovich,
664025 Irkutsk, st. Lenina, 3,
Irkutsk State University, Faculty of Geology,
undergraduate student of the second course,
email: nikitajro1@mail.ru.
Kalinin Vyacheslav Sergeevich,
664025 Irkutsk, st. Lenina, 3,
Irkutsk State University, Faculty of Geology,
undergraduate student of the second course,
email: slavochka_kalinin_00@mail.ru.
Zaripov Maxim Sergeevich,
664003 Irkutsk, st. Lenina, 3,
Irkutsk State University, Faculty of Geology,
undergraduate student of the second course,
email: zarypov.2000@mail.ru.
Dambaev Sodnom Amagalanovich,
664025 Irkutsk, st. Lenina, 3,
Irkutsk State University, Faculty of Geology,
undergraduate student of the second course,
email: sodadambaev13@gmail.com.
Kovalenko Sergey Nikolaevich,
Candidate of Geological and Mineralogical Sciences,
664025 Irkutsk, st. Lenina, 3,
Irkutsk State University, Faculty of Geology,
Associate Professor of the Dynamic Geologychair,
tel.: (3952)20-16-39,
email: igpug@mail.ru.
Yasnygina Tatyana Alexandrovna,
candidate of geological and mineralogical sciences,
Senior Researcher,
664033 Irkutsk, st. Lermontova, 128,
Institute of the Earth's Crust SB RAS,
tel.: (3952) 51–16–59,
email: ty@crust.irk.ru.
Chuvashova Irina Sergeevna,
candidate of geological and mineralogical sciences,
Senior Researcher,
664025 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,
email: chuvashova@crust.irk.ru.
Saranina Elena Vladimirovna,
candidate of geological and mineralogical sciences,
Senior Engineer,
664033 Irkutsk, st. Lermontova, 128,
Institute of the Earth's Crust SB RAS,
Lead Engineer,
664033 Irkutsk, Favorskiy str., 1 "A",
A.P. Vinogradov Institute of Geochemistry SB RAS,
email: e_v_sar@mail.ru.
Rasskazov Sergei Vasilievich,
doctor of geological and mineralogical sciences, professor,
664025 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,
email: rassk@crust.irk.ru.
Abstract. A comparative analysis is performed between compositions of pebbles and sandy filler of a pebble package that finalizes a section of the Lower Pliocene Buguldeyka alluvium horizon in the middle part of the Pra-Manzurka valley and those of pebbles and sandy cement of the Middle Jurassic conglomerates of the Nizhniy Koty sub-formation from outcrops of the Angara-Koty depression in the southeastern part of the Irkutsk coal basin. A partial similarity in major oxide and trace element contents in trachydacites and rhyolites of pebbles from Pliocene and Jurassic deposits is defined. From the difference in major oxide and trace element contents of the sand filler of the lower and upper layers of the pebble package of the Pra-Manzurka valley, the difference in their sources is inferred. It is proposed that the convergence between the composition of the sandy filler of the lower layers of the Pliocene pebble package and those of the trachydacite-rhyolite pebbles from this and of the sand cement of the Middle Jurassic conglomerates may reflect the erosion of the clastic material of the Middle Jurassic conglomerates and its removal into the middle part of the Pra-Manzurka valley in the initial phase of the uplift of the Primorsky Range. Occurrence of a Th/Co anomaly in the lower layers of the pebble unit, not typical for Jurassic conglomerates, indicates the formation of the pebbles from another source of clastic material.
Keywords: Irkutsk coal-bearing basin, Baikal, Jurassic, Aalenian stage, Pliocene, Manzurka alluvium, rhyolite, trachydacite, plumasitic rocks.
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