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Native iron in the sediments of Lake Baikal (borehole BDP-98): results of thermomagnetic analysis |
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| Authors: | D.M. Pechersky D.M. Gil’manova E.V. Ivanov M.I. Kuz’min G.P. Markov D.K. Nurgaliev V.A. Tsel’movich |
| Affiliation: | 1. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, ul. Bol’shaya Gruzinskaya 10, Moscow, 123995, Russia;2. Kazan Federal University, ul. Kremlevskaya 18, Kazan, 420008, Russia;3. Vinogradov Institute of Geochemistry, ul. Favorskogo 1a, Irkutsk, 664033, Russia |
| Abstract: | We performed a thermomagnetic analysis of 91 samples and a probe microanalysis of five samples of sedimentary rocks from the lower zone of the borehole BDP-98 drilled at the bottom of Lake Baikal. The results show the scarcity of native iron: It was found only in five samples. Its concentration varies from ～10–5 to 7 × 10–4%. The distribution of native iron by content is bimodal, with a distinct “zero” mode. This scarcity of native iron in the Baikal sediments distinguishes them from continental (Eurasia) and oceanic (Atlantic) sediments of different ages. It is due to the high rate of sedimentation in the studied interval of BDP-98. |
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