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 SM ISO690:2012АЛЕКСЕЕВ, Василий, CERBARI, Valerian, БУРГЕЛЯ, Аурелий, VARLAMOV, Eugen. Элювиальный процесс и баланс масс породообразующих силикатных минералов в покровных отложениях водоразделов Молдовы
. In: Buletinul Institutului de Geologie şi Seismologie al AŞM, 2009, nr. 2, pp. 99-108. ISSN 1857-0046. |
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| Buletinul Institutului de Geologie şi Seismologie al AŞM | ||||||
| Numărul 2 / 2009 / ISSN 1857-0046 | ||||||
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| Pag. 99-108 | ||||||
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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 was derived mass
balance of primary, clay minerals, and total mass balance of rock-forming minerals of blanket
deposits. For the first time there were found volumes of eluvial losses of silicate material masses
from quaternary deposits under action of pedogenesis. The obtained data extend to separate
minerals and groups of minerals. As a witness of hypergenic changes in soils quartz was used as
a material resistant to weathering.
Investigations were implemented in zones with hydrothermal coefficients (humidification
coefficients by Visotsky-Ivanov) 0,50-0,55, 0,60-0,65, 0,65-0,70, 0,70-0,80. There was found
that eluvial losses of carcass minerals in chernozems came to 36-111 t/ha, layered
minerals - 65-346 t/ha, i.e. layered minerals are exposed to more intensive destruction. Among
clay minerals the largest eluvial losses are in smectite. They came to from 165-234 t/ha in
ordinary chernozems of southern Moldova to 651-1044 t/ha in typical and leached chernozems
of the country’s northern part. Illite exposed positive balance within 220-271 t/ha. Losses of
primary silicates in blanket deposits under action of chernozem pedogenesis flow irreversibly.
Mineralogical composition of their clay fraction transforms according to more complicate
scheme – it changes loosing smectite and chlorite, and relative enrichment with illite.
Total losses of primary minerals by chernozem subtypes constituted from 400 to 900 t/ha,
clay minerals - from 30 to 900 t/ha. Sum losses of silicate minerals from covering deposits of
watershed areas of Moldova under action of pedogenesis are measured by volumes from 400 to
1800 t/ha. Obtained data represent considerable scientific interest. They form new vision of
sizes of hypergenic changes of surface geological deposits of the republic and give possibility to
produce reasonable assessment of regional geochemical losses of elements.
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