Гипергенез, геохимия кремния и возраст минералогических профилей черноземов водоразделов Молдовы
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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.
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Buletinul Institutului de Geologie şi Seismologie al AŞM
Numărul 2 / 2010 / ISSN 1857-0046

Гипергенез, геохимия кремния и возраст минералогических профилей черноземов водоразделов Молдовы

Pag. 23-33

Алексеев Василий
 
Институт почвоведения, агрохимии и защиты почв «Николае Димо»
 
Disponibil în IBN: 14 decembrie 2013


Rezumat

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.

Обзор литературы по геохимии кремния выявил связь между размерами стока, выноса этого элемента и возрастом почв. Дана оценка роли фитолитов в расчетах возраста черноземов. Показана оригинальность постановки исследований и определения возраста минералогических профилей этих почв. Впервые в Молдове и, возможно, для внеледниковой области степного и лесостепного пространства других регионов установлен возраст минералогических профилей черноземов водоразделов, который измеряется 20-70 тыс. лет и восходит по своему происхождению к эпохам почвообразования за пределами голоцена.