FIRST LA-ICP-MS APATITE FISSION-TRACK AGES FROM THE SIBERIAN PLATFORM BASEMENT (NEPSKO-BOTUOBINSKAYA ANTECLISE)

T. E. Bagdasaryan; Багдасарян Т. Э.; A. V. Gayduk; Гайдук А. В.; V. B. Khubanov; Хубанов В. Б.; A. V. Latyshev; Латышев А. В.; R. V. Veselovskiy; Веселовский Р. В.

doi:10.31857/S2686739723600248

FIRST LA-ICP-MS APATITE FISSION-TRACK AGES FROM THE SIBERIAN PLATFORM BASEMENT (NEPSKO-BOTUOBINSKAYA ANTECLISE)

Authors: Bagdasaryan T.E.¹^,2, Gayduk A.V.³, Khubanov V.B.⁴, Latyshev A.V.¹^,2, Veselovskiy R.V.¹^,2
Affiliations:
1. Lomonosov Moscow State University, Geological faculty
2. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences
3. “Energy Research” LLC
4. Dobretsov Geological Institute, Russian Academy of Sciences, Siberian Branch
Issue: Vol 510, No 2 (2023)
Pages: 161-165
Section: GEOCHEMISTRY
Submitted: 30.01.2025
Published: 01.06.2023
URL: https://edgccjournal.org/2686-7397/article/view/649646
DOI: https://doi.org/10.31857/S2686739723600248
EDN: https://elibrary.ru/UKOOMQ
ID: 649646

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Abstract
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Abstract

We present the first results of LA-ICP-MS apatite fission-track dating (AFT) from nine core samples from wells, that exposed the top of the crystalline basement of the Siberian platform within the Nepsko-Botuobinskaya anteclise on the ~2 km depth. Obtained AFT ages belong to three clusters with mean values of 200, 140, and 60 Ma. A thermal event of ~200 Ma is widespread throughout almost the entire Siberian platform and reflects the stage of its Early Jurassic uplift. Reset of the fission-track geochronometer in apatite ~140 Ma correlates with tectono-thermal event marking the final stage of the Mongol-Okhotsk fold belt collision. The youngest AFT ages of ~60 Ma, on the one hand, may reflect the early (crypto) stage of the Baikal rifting, and, on the other hand, be a consequence of the high content of uranium in apatite.

Keywords

fission-track dating, apatite, LA-ICP-MS, thermochronology, geochronology, Siberian platform, thermal evolution, basement, tectonics

References

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