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Problems of Developing the Pleistocene Radiocarbon Chronology within high Mountain Terranes by the Example of Russian Altai

Published online by Cambridge University Press:  22 July 2019

Anna Agatova ,
Roman Nepop ,
Elya Zazovskaya Open the ORCID record for Elya Zazovskaya [Opens in a new window] ,
Ivan Ovchinnikov  and
Piotr Moska
Anna Agatova
Affiliation:
Sobolev Institute of geology and mineralogy SB RAS, Laboratory of lithogeodynamics of the sedimentary basins, Novosibirsk, Russia
Roman Nepop
Affiliation:
Sobolev Institute of geology and mineralogy SB RAS, Laboratory of lithogeodynamics of the sedimentary basins, Novosibirsk, Russia
Elya Zazovskaya*
Affiliation:
Institute of Geography, Russian Academy of Sciences, Laboratory of Radiocarbon Dating & Electronic microscopy, Department of Soil Geography & Evolution, Staromonetniy Pereulok 29, Moscow 119017, Russia
Ivan Ovchinnikov
Affiliation:
Sobolev Institute of geology and mineralogy SB RAS, Laboratory of Geology of Cenozoic, Paleoclimatology and Mineralogical Climate Indicators, Novosibirsk, Russia
Piotr Moska
Affiliation:
Institute of Physics, Silesian University of Technology, Department of Radioisotopes, Gliwice, Poland
*
*Corresponding author. Email: [email protected].
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Abstract

The paper presents a discussion of 24 radiocarbon (14C) dates of organic material from deposits of various genesis within the intermountain depressions and valleys of the Russian Altai. These apparent 14C ages (sometimes near the upper time limit of the 14C dating method) contradict to other proxy data and optically stimulated luminescence (OSL) dates. Rejuvenation of ancient deposits by 14C dating encountered two problems: (1) wrong interpretation of previously unknown near-surface location of Tertiary deposits as being of the Pleistocene ones with the redeposited ancient flora; and (2) wrong age estimation of the Pleistocene-Holocene deposits with redeposited Carboniferous, Jurassic, and Neogene organic material, which is represented as inclusions. Significant scattering of 14C ages, their inversion within a section, and discrepancy with other proxy data indicate penetrating of the “young” carbon into ancient organic material, and its presence in a unique (for each sample) ratio. Today such contamination cannot be eliminated utilizing standard pre-treatment techniques. The influx of “young” carbon is related to post-sedimentation tectonic and exogenous processes, which are common for tectonically active mountain provinces including Altai. The reported problem is not a new one, although methodological studies in the Russian Altai have not yet been carried out earlier.

Keywords

apparent 14C agespaleogeographical reconstructionsradiocarbon datingRussian Altai
Type
Conference Paper
Information
Radiocarbon , Volume 61 , Issue 6: Radiocarbon 2018 Conference Proceedings Trondheim, Norway, June 17–22, 2018 Part 2 of 2 , December 2019 , pp. 2019 - 2028
Copyright
© 2019 by the Arizona Board of Regents on behalf of the University of Arizona 

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Footnotes

Selected Papers from the 23rd International Radiocarbon Conference, Trondheim, Norway, 17–22 June, 2018

References

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