|Conţinutul numărului revistei|
|Ultima descărcare din IBN:|
| SM ISO690:2012|
АЛЕКСЕЕВ, Василий; CERBARI, Valerian; БУРГЕЛЯ, Аурелий; VARLAMOV, Eugen. Элювиальный процесс и гипергенная геохимическая трансформация силикатной части покровных отложений водоразделов Молдовы . In: Buletinul Institutului de Geologie şi Seismologie al AŞM. 2010, nr. 1, pp. 52-60. ISSN 1857-0046.
|Buletinul Institutului de Geologie şi Seismologie al AŞM|
|Numărul 1 / 2010 / ISSN 1857-0046|
The article continues a series of publications on hypergenic processes in quaternary deposits
of watersheds of Moldova. As a result of investigations, for the first time in Moldova and probably
for Eurasian steppe and forest-steppe area in the whole, there were found volumes of eluvial losses
of masses of oxides of the basic macroelements from covering deposits of watersheds under action of
chernozem pedogenesis. Volumes of macroelements' losses were calculated on those of masses of
primary and clay minerals, derived by the use of quantitative mineralogical analysis. As a witness of
changes in soils there was used quartz as material resistant to weathering. Investigations were
implemented in contemporary damping zones with hydrothermal coefficients (damping coefficients
by Visotsky-Ivanov) 0.50-0.55, 0.60-0.65, 0.65-0.70 and 0.70-0.80. Volumes of eluvial losses of
masses of oxides of macroelements are regular nature and grow as soil moisture increases.
It was found that eluvial losses of oxides in subtype series of chernozems by SiO2 were from
200 t/ha in ordinary to 800 t/ha in leached ones, by Al2O3 - from 100 to 450 t/ha correspondingly. In
weathering of iron minerals soil received from 30 to 190 t/ha of Fe2O3. Losses of СаО were
measured by 5-15 t/ha, MgO – 3-75 t/ha. Losses of oxides of alkali elements K and Na were for the
first one from 5 to 27 t/ha, for the second one – from 6 to 13 t/ha. Total losses of oxides
of macroelements by subtypes of chernozems as result of weathering were expressed by sizes in 400-
600 t/ha in ordinary and in 1200-1600 t/ha in typical and leached ones.
Data on losses of macroelements obtained by the use of mineralogical analysis contradict
with the concept of inertness of aluminosilicate part of chernozems (including its coarse material
represented by feldspars and mica) based on chemical analysis. They have an important
methodological significance, because they allow forming a new point of view to geochemistry of
macroelements and ecology of steppe and forest-steppe landscapes.