Transformation pathway of carbonate pedofeatures based on their micromorhology and carbon isotope data in the Northern Caucasus region, Russia |
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| Authors: | O S Khokhlova AM Kouznetsova A A Khokhlov |
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| Institution: | (1) Institute of Physicochemical and Biological Problems of Soil Science, Russian Academy of Sciences, ul. Institutskaya 2, Pushchino, Moscow region, 142290, Russia;(2) Laboratory of Electron Microscopy, Biological Faculty, Moscow State University, Moscow, 119899, Russia;(3) Institute of Cell Biophysics, Russian Academy of Sciences, ul. Institutskaya 3, Pushchino, Moscow region, 142290, Russia |
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| Abstract: | Carbonate pedofeatures (CPs) in a chronosequence of paleosols buried under kurgans in the Northern Caucasus region of Russia
in a period from the end of the 4th to the middle of the 5th centuries AD (It seams that there is no time left) were studied
by using a set of morphological and isotopic methods. The CPs in chernozem-type soils of Russia are usually represented by
crystallomorphic calcite whereas the non-segregated carbonates occurred at the same horizons — by collomorphic one. Those
two morphotypes of calcite have the differences in elemental composition and isotopic composition of carbon and, hence, should
have different origins — from true and colloidal solutions, respectively. The same differences including radiocarbon age have
been revealed for pseudomycelium of the ABca horizon of the youngest paleosols as compared with the same CPs of other paleosols
in the chronosequence studied. Our assumption is that it was succeeded in finding that the pseudomycelium right away after
its precipitation from a colloidal solution migrated from the lower soil horizons to the surface horizons during the periods
of climatic aridization. After a short time interval (not more than 25–50 years) collomorphic calcite in the pseudomicelium
of the yongest paleosols mentioned above will likely become by “usual” acicular calcite. |
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| Keywords: | Carbonate pedofeature chernozems kurgans holocene paleosol set of morphological and isotopic method |
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