IMHE OpenIR  > Journal of Mountain Science  > Journal of Mountain Science-2009  > Vol6 No.2
Variability of carbonate pedofeatures in a loess-paleosol sequence and their use for paleoreconstructions
Kovda, I; Sycheva, S.; Lebedeva, M.; Inozemtzev, S.
Corresponding AuthorKovda, I
AbstractCarbonate pedofeatures were studied in details in a loess-paleosol pedocomplex near Kursk, in the central part of the European Plain. The soils studied included a modern Chernozem and five Pleistocene paleosols. Carbonate morphologies and distributions were described in the field. Various morphologies were sampled for further studies including micromorphology in thin sections and submicroscopic studies under a scanning electron microscope. The complex approach of investigation at macro-, micro-, and submicroscopic levels found that most of carbonate pedofeatures are secondary and multiphase. Many of them are related to cryogenic features. The general trend was of decreasing carbonate content in the older paleosols except for increased content in the 1(st) and 3(rd) paleosols. Most of carbonate morphologies are similar in the modern soil and paleosols, but pseudomycelium was found only in the modern Chernozem, while soft masses and impregnations are associated with the paleosols. Detailed study on carbonate attributes revealed their specific features in the modern soil and in paleosols. Veins have dissolution features under the modern environment and seem to reprecipitate in form of pseudomycelium. Coatings in paleosols at a depth of the 1(st) paleosol include specific fine tubes. Powdery soft masses and impregnations in the paleosols are strongly related to cryogenic fissures and paleopermafrost level. Under SEM they consist of tiny crystals, much smaller than in regular soft masses. Several types of hard concretions were identified: rounded, irregular and platy. Small concretions in the modern Chernozem have similar morphology and similar (14)C-age as the rounded concretions of the upper paleosols. They are expected to represent the same generation of concretions. Platy concretions fill the bottom part of the large fissures. The (14)C-age of hard concretions varies from 3310 +/- 80 yrs. B.P in the 1(st) paleosol up to 20 400 yrs. B.P. in the 3(rd). As a result we found the reflection of several wet-dry and cold-warm stages in carbonate morphologies and distributions. High variability of carbonates at macro-, micro- and submicroscopic levels indicates several generations and multiphase formation of carbonate pedofeatures in the loess-paleosol pedocomplex. Carbonate pedofeatures in the examined pedocomplex are more informative for the study of late Pleistocene and Holocene climatic cycles rather than characterization of a single paleosol.
KeywordLoess-paleosol Pedocomplex Pedogenic Carbonates Macr- And Microforms
Document Type期刊论文
CollectionJournal of Mountain Science_Journal of Mountain Science-2009_Vol6 No.2
Corresponding AuthorKovda, I
Recommended Citation
GB/T 7714
Kovda, I,Sycheva, S.,Lebedeva, M.,et al. Variability of carbonate pedofeatures in a loess-paleosol sequence and their use for paleoreconstructions[J]. JOURNAL OF MOUNTAIN SCIENCE,2009,6(2):155–161.
APA Kovda, I,Sycheva, S.,Lebedeva, M.,&Inozemtzev, S..(2009).Variability of carbonate pedofeatures in a loess-paleosol sequence and their use for paleoreconstructions.JOURNAL OF MOUNTAIN SCIENCE,6(2),155–161.
MLA Kovda, I,et al."Variability of carbonate pedofeatures in a loess-paleosol sequence and their use for paleoreconstructions".JOURNAL OF MOUNTAIN SCIENCE 6.2(2009):155–161.
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