C - Lublin
C - Lublin
C - Lublin
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exchange than that in the white soft spots and testifies to the hydrogenous nature of<br />
the nodules.<br />
Table. 1. СaCO 3 content in CAs, thermal characteristic, data on isotopic<br />
composition and X-ray diffraction pattern for calcite<br />
Soil,<br />
horizon,<br />
depth, cm<br />
Soil I,<br />
В2са,170<br />
-200<br />
Soil II,<br />
В1са,130<br />
-170<br />
Soil III,<br />
В1са,130<br />
-150<br />
Soil IV,<br />
В2са,<br />
150-170<br />
Sample<br />
White<br />
soft spots<br />
White<br />
soft spots<br />
with hard<br />
core<br />
White<br />
soft spots<br />
with hard<br />
core<br />
Hard<br />
nodules<br />
Content<br />
CaCO 3 in<br />
CAs, %<br />
isotopic<br />
composi-<br />
tion of<br />
carbon<br />
in CAs,<br />
‰<br />
100 -9,6<br />
Data on<br />
thermal analysis<br />
temperature (°С) of<br />
X-ray<br />
diffraction<br />
pattern<br />
maximum<br />
beginning<br />
end d 104<br />
of structural decomposition<br />
700<br />
810<br />
740<br />
860<br />
800<br />
890<br />
0.037<br />
69 -10,7 790 880 920 0.037<br />
89 -12,0 770 880 920 0.037<br />
89 -13,2 800 870 920 0.037<br />
We can conclude that the white soft spots and hard nodules in the Chernozems<br />
of the steppe area of the Southern Pre-Ural develop in distinctly different<br />
conditions, i.e., automorphic and hydromorphic ones, accordingly. If the white<br />
spots in the soil of the upper part in catena form from the true solution It can<br />
marked out the intermediate forms of CAs – the white soft spots with hard cores<br />
that develop in the transit part of catena under interchange of automorphic and<br />
hydromorphic conditions of soil formation. The complex study of CAs using<br />
hierarchical morphological approach and instrumental techniques lets us to get<br />
additional information and data that point directly to the genesis of the different<br />
kinds of CAs.<br />
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