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Redistribution of radionuclides between a microbial mat and a carbonate body at the Garga hot spring (Baikal Rift Zone)

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Abstract

The features of present deposits that form in the vicinity of hot springs can provide clues to the parameters of paleowaters in places of past hydrothermal activity marked by remnant carbonate and/or siliceous sinter. We investigated a large carbonate body at the Garga hot spring developing in the Baikal zone of nitric hydrotherms in the Barguzin Rift Zone valley. The main focus was on the structure of the carbonate mound, as well as on the partitioning of radioactive elements between the cyanobacterial mat and the inorganic component of the body (the issue that has never been explored before). The cyanobacterial community of the Garga spring is an active biosorbent of 226Ra, 228Ra, 210Pb. The radionuclides accumulated by biosorption become preserved in minerals that form within the bacterial community. The reported data of mineral formation in the cyanobacterial mat along with the mineralogy and structure of the carbonate mound of the Garga spring have implications for the complex history of the Garga body. It has been produced jointly by precipitation from the venting thermal water (opal-calcite-fluorite-barite-celestine assemblage) and microbial metabolic activity (coarse calcite and thin black encrustation rich in Mn minerals).

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Authors and Affiliations

  1. Sobolev Institute of Geology and Mineralogy SB RAS Novosibirsk, Russia Institute of Cytology and Genetics SB RAS, Novosibirsk, Russia

    E. V. Lazareva, S. M. Zhmodik, M. S. Melgunov, I. V. Petrova & A. V. Bryanskaya

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  1. E. V. Lazareva
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  2. S. M. Zhmodik
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  3. M. S. Melgunov
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  4. I. V. Petrova
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  5. A. V. Bryanskaya
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Correspondence to E. V. Lazareva.

Additional information

Published in Russian in Doklady Akademii Nauk, 2011, Vol. 439, No. 5, pp. 669–676.

The article was translated by the authors.

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Lazareva, E.V., Zhmodik, S.M., Melgunov, M.S. et al. Redistribution of radionuclides between a microbial mat and a carbonate body at the Garga hot spring (Baikal Rift Zone). Dokl. Earth Sc. 439, 1131–1137 (2011). https://doi.org/10.1134/S1028334X11080174

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  • DOI: https://doi.org/10.1134/S1028334X11080174

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