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АЛЕКСЕЕВ, Василий. Гипергенез, геохимия кремния и возраст минералогических профилей черноземов водоразделов Молдовы . In: Buletinul Institutului de Geologie şi Seismologie al AŞM. 2010, nr. 2, pp. 23-33. ISSN 1857-0046.
|Buletinul Institutului de Geologie şi Seismologie al AŞM|
|Numărul 2 / 2010 / ISSN 1857-0046|
Literature analysis demonstrated the importance of studying silicon geochemistry problem
statement. Studies of hypergenic processes in surface sediments of Moldova represent definite
contribution in this regard. Literature review identified relationship between amount of silicon
loss in soils and soils age, between soils age and age of planation surfaces, between amount of
silicon loss in soils and runoff volume. At the same time it contains no information on utilization of
data on silicon loss for particular soils age determination, which makes us believe that our
investigations are original in this respect, and also that silicon losses were determined not by
chemical methods, but by quantitative mineralogical analysis.
It was shown that weathering products removal in chernozems of Moldova could take place
not just in more humid periods of Holocene, but it's also taking place at the present time in
modern climate conditions at the expense of winter-spring period precipitations. There was
analyzed role of phytoliths silica in assessment of silicon loss in soils which should be subtracted
from total silicon loss in soil. It was also found that phytoliths aging doesn't bring to neoformation
of phytogenous silica, and it can't affect the calculations of silicates losses in soils.
On the basis of published data on silicon losses in soils in conditions of steppe and forest-
steppe landscapes, and our data on the sizes of silicates losses in the process of hypergenesis for
the first time in Moldova and probably for out of the glacial area of steppe and forest-steppe space
of other regions there was determined the age of mineralogical profiles of watersheds chernozems.
It is 20-70 thousand years and naturally increases in the subtype series of these soils from south to
north. It's 2-7 times greater than duration of Holocene, what gives grounds to bind generation of
mineralogical profiles of modern chernozems with other epoches of soil formation.