Summary
As a result of the limnological peculiarities of Lake Baikal, different forms of oxidized Fe and Mn accumulations are widely spread throughout the lake, not only in the uppermost sediments, but also within the sequence of reduced sediments. We present the results of a detailed study of an unusual, oxidized core, up to 2 m long, from the underwater Academician Ridge. This study led us to propose that the Fe/Mn crusts lying deep (several meters) below the bottom surface are not markers of past climatic events, as was suggested previously. They may be the result of a specific diagenetic redistribution of sedimentary Fe and Mn at conditions of slow sedimentation and a sedimentary Corg. deficit, which is typical of an oxidation front in a nonsteady-state diagenetic system. Ancient Fe/Mn crusts of subaerial origin, which have been submerged as a result of tectonic events in this area, could serve as the initial material for such a redistribution. A mechanism for the formation of deep oxidized sedimentary sequences in the Academician Ridge region is proposed.
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References
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© 2003 Springer Japan
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Granina, L.Z. et al. (2003). Sedimentary Fe/Mn Layers in Lake Baikal as Evidence of Past and Present Limnological Conditions. In: Kashiwaya, K. (eds) Long Continental Records from Lake Baikal. Springer, Tokyo. https://doi.org/10.1007/978-4-431-67859-5_13
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DOI: https://doi.org/10.1007/978-4-431-67859-5_13
Publisher Name: Springer, Tokyo
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