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Rb-Sr age of the riphean glauconites of the Kamov group (Baikit anteklise, Siberian platform)
- Authors: Zaitseva T.S.1, Kuznetsov A.B.1, Ivanova N.A.2, Maslennikov M.A.2, Pustylnikova V.V.2, Turchenko T.L.1, Nаgovitsyn K.E.3
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Affiliations:
- Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences
- Siberian Research Institute of Geology Geophysics and Mineral Resources
- Trofimuk Institute of Petroleum Geology and Geophysics Sibirian Branch of the Russian Academy of Sciences
- Issue: Vol 488, No 1 (2019)
- Pages: 52-57
- Section: Geology
- URL: https://journals.eco-vector.com/0869-5652/article/view/16200
- DOI: https://doi.org/10.31857/S0869-5652488152-57
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Abstract
A mineralogical and geochemical study was conducted and the Rb-Sr age of globular layered silicates (GPS) of the glauconite-illite series of the Dolgokta Formation from a parametric Chunkinskaya-282 drillcore was determined. The assessment of suitability of the mineral for geochronological purposes took into account the data of Mössbauer spectroscopy and modeling of the cation distribution in the GPS octahedral net. Mineralogical and crystalochemical characteristics indicate an epigenetic alteration of glauconite structure; therefore, its Rb-Sr isochronous age (1300 ± 7 Ma) is “rejuvenated” and reflects the stage of partial recrystallization. The 87Sr/86Sr ratio in dolomites of the Dolgokta and Kuyumba formations varies from 0.70602 to 0.72230, which confirms the epigenetic recrystallization. The model Rb-Sr age of glauconite, calculated taking into account the enrichment of radiogenic 87Sr, is within 1340-1400 Ma. The age estimate determines the upper limit of distribution of the Mesoproterozoic fossil Tappania, found in the Yurubchen and Dolgokta formations of the Baikit anteclise.
About the authors
T. S. Zaitseva
Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences
Email: antonbor9@mail.ru
Russian Federation, 2, Makarova embankment, St.Petersburg, 199034
A. B. Kuznetsov
Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences
Email: antonbor9@mail.ru
Corresponding Member of the Russian Academy of Sciences
Russian Federation, 2, Makarova embankment, St.Petersburg, 199034N. A. Ivanova
Siberian Research Institute of Geology Geophysics and Mineral Resources
Author for correspondence.
Email: antonbor9@mail.ru
Russian Federation, 67, Krasny Prospekt, Novosibirsk, 630091
M. A. Maslennikov
Siberian Research Institute of Geology Geophysics and Mineral Resources
Email: antonbor9@mail.ru
Russian Federation, 67, Krasny Prospekt, Novosibirsk, 630091
V. V. Pustylnikova
Siberian Research Institute of Geology Geophysics and Mineral Resources
Email: antonbor9@mail.ru
Russian Federation, 67, Krasny Prospekt, Novosibirsk, 630091
T. L. Turchenko
Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences
Email: antonbor9@mail.ru
Russian Federation, 2, Makarova embankment, St.Petersburg, 199034
K. E. Nаgovitsyn
Trofimuk Institute of Petroleum Geology and Geophysics Sibirian Branch of the Russian Academy of Sciences
Email: antonbor9@mail.ru
Russian Federation, 3, Koptyg prosrect, Novosibirsk, 630090
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