Paleosols in upper permian sedimentary rocks, Sukhona river (Severnaya Dvina basin) |
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| Authors: | E Yu Yakimenko V O Targul’yan N M Chumakov M P Arefev S A Inozemtsev |
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| Institution: | (1) Institute of Geography, Russian Academy of Sciences, Staromonetnyi per. 29, 109017 Moscow, Russia;(2) Moscow State University (MGU), 119899 Vorob’evy gory, Moscow, Russia;(3) Geological Institute (GIN), Russian Academy of Sciences, Pyzhevskii per. 7, 109017 Moscow, Russia |
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| Abstract: | Paleosols crop out in the Sukhona River valley as several members, up to 10 m thick, embedded into the Salarevo Formation
sediments. Principal characteristics of paleosols include a dense network of root channels, indications of eluvial gley alteration,
redistribution and formation of secondary carbonates represented by several generations, and formation of block-prismatic
soil structure with specific clayey films at structural jointing faces. The paleosols are divided into a number of genetically
interrelated horizons (from top to bottom): presumably organogenic accumulation (AElg), eluvial gley horizon (Elg), illuvial
horizons (B1 and B2), illuvial gley horizon (Bg), and transitional horizons (ElBg and BElg). Paleosols were formed under conditions of a semiarid
climate with sharp seasonal or secular and multisecular oscillations of atmospheric precipitation. Such soils point to specific
ecological environments, which were existing in the northern semiarid belt of the Earth before greatest (in the Phanerozoic)
biospheric crisis at the Permian-Triassic boundary. |
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