Email this article The first results of tephrochronological investigations of the late pleistocene-holocene volcanic explosions in the valley of the Zhom-Bolok River (Eastern Sayan)
- Authors: Shchetnikov A.A.1,2, Bezrukova E.V.3, Kerber E.V.2, Belozerova O.Y.2, Kuz'min M.I.2, Ivanov E.V.2, Krainov M.A.2, Filinov I.A.1,2,4, Nechaev I.O.4
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Affiliations:
- Institute of the Earth`s Crust of the Siberian Branch of the Russian Academy of Sciences
- Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences
- Industrial University of Tyumen
- Irkutsk State University
- Issue: Vol 486, No 3 (2019)
- Pages: 336-340
- Section: Geology
- URL: https://journals.eco-vector.com/0869-5652/article/view/13491
- DOI: https://doi.org/10.31857/S0869-56524863336-340
- ID: 13491
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Abstract
This article presents first tephrochronological data on the volcanic activity in the valley of the Jom-Bolok River (East Sayan Mountains, Siberia), which is the largest manifestation of the Holocene eruptions in Central Asia. The data results from our study of the proglacial Kaskadnoe-1 Lake situated near the Jom-Bolok basalt field. The lake sediments include a series of tephra-rich layers. Radiocarbon dating of the lake sediments provided a robust age model which allowed us to build timing of eruptions formed the Jom-Bolok volcanic field. We recognize two large phases of volcanism separated by almost 5 thousand years dormant phase. The first phase is traced back to ca. 14.3 cal ka BP and lasted until 6.3 cal ka BP. Ten clusters of microtephra layers in the sediments of the first phase show 300-800 years recurrence of the volcanic events weakening upward. The event of 14.3-13.3 cal ka BP probably represents the strongest eruptions of the Jom-Bolok. The second phase started ca. 1.6 cal ka BP and highly likely continues in our days. Its strongest eruptions occurred between 1.6 and 0.8 cal ka BP with periodicity of 200 years. This tephrostratigraphy shows a multiplicity of the Jom-Bolok volcanic events and amplifies the earlier built scheme resulted from investigations of the stratified basalts, pyroclasts and lake damming events.
About the authors
A. A. Shchetnikov
Institute of the Earth`s Crust of the Siberian Branch of the Russian Academy of Sciences; Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences
Author for correspondence.
Email: shch@crust.irk.ru
Russian Federation, 128, Lermontova street, Irkutsk, 664033; PBox 9, 1a, Favorsky street, Irkutsk, 664033
E. V. Bezrukova
Industrial University of Tyumen
Email: shch@crust.irk.ru
Russian Federation, 38, Volodarskogo street, Tyumen, 625000
E. V. Kerber
Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences
Email: shch@crust.irk.ru
Russian Federation, PBox 9, 1a, Favorsky street, Irkutsk, 664033
O. Yu. Belozerova
Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences
Email: shch@crust.irk.ru
Russian Federation, PBox 9, 1a, Favorsky street, Irkutsk, 664033
M. I. Kuz'min
Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences
Email: shch@crust.irk.ru
Academician of the Russian Academy of Sciences
PBox 9, 1a, Favorsky street, Irkutsk, 664033E. V. Ivanov
Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences
Email: shch@crust.irk.ru
Russian Federation, PBox 9, 1a, Favorsky street, Irkutsk, 664033
M. A. Krainov
Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences
Email: shch@crust.irk.ru
Russian Federation, PBox 9, 1a, Favorsky street, Irkutsk, 664033
I. A. Filinov
Institute of the Earth`s Crust of the Siberian Branch of the Russian Academy of Sciences; Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences; Irkutsk State University
Email: shch@crust.irk.ru
Russian Federation, 128, Lermontova street, Irkutsk, 664033; PBox 9, 1a, Favorsky street, Irkutsk, 664033; 1, Karl Marx street, Irkutsk, 664003
I. O. Nechaev
Irkutsk State University
Email: shch@crust.irk.ru
Russian Federation, 1, Karl Marx street, Irkutsk, 664003
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