Rb-Sr age of the riphean glauconites of the Kamov group (Baikit anteklise, Siberian platform)

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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, 199034

N. 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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