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- Title
Middle Devonian Acid Sulfate Paleosol: The First Finding in the Central Devonian Field (Voronezh High, Southern Russia).
- Authors
Alekseeva, T. V.; Alekseev, A. O.
- Abstract
The Middle Devonian (Eifelian) paleosol (PS) recently discovered in the area of Voronezh Anteclise has been studied in detail. The PS is developed from acid volcanic rock, rhyolitic tuff. The thickness of laterally continuous PS varies from 20 to 150 cm depending on the relief of the Proterozoic basement beneath it. The tuff contains the inclusions of allochthonous coal particles most part of which is partially or completely substituted by pyrite. The main part of coal particles belongs to the remnants of nematophytes (Nematophyta and Prototaxites). The absence of rhizoliths and the microstructure of plant debris suggest that the PS developed under primitive rootless vegetation. The set of obtained analytical characteristics demonstrates that this PS is an analogue of the modern acid sulfate soils. The PS formation was the result of predominantly chemical weathering initiated by pyrite oxidation. The following pedological characteristics were noted: kaolinite formation and redistribution; tonguing soil bottom; iron mobility; formation of iron- and gypsum-containing nodules; and in situ formation of gypsum, iron oxides, and iron sulfates. Characteristic of the PS top is an increase of Al2O3 and Fe2O3; the values of Al/Ti, Ba/Sr, and K/Rb ratios; and the lateritization index. The pedogenesis had the local (focal) character without formation of distinct soil horizons.
- Subjects
VORONEZH (Russia); RUSSIA; ACID sulfate soils; PALEOPEDOLOGY; CHEMICAL weathering; SOIL horizons; KAOLINITE; IRON sulfates; PYRITES
- Publication
Eurasian Soil Science, 2024, Vol 57, Issue 1, p9
- ISSN
1064-2293
- Publication type
Article
- DOI
10.1134/S1064229323602469