Vol. 43 No. 2 (219) (2009)

On the basis of conducted field geological, petrographic investigations the magmatic origin of carbonatites of the Sevan ridge is proved, which previously were considered as contact-metasomatic formations – listvenites. These are a new type of carbonatites, which are spatially and in all probability genetically related to ultramaphic complex of Amasia-Sevan-Akera ophiolit zone, without any attributes of connectivity with alkaline rocks formation. It is significant that these carbonatites appear with the presence of accessory minerals of spinell group.

The ore knot is placed on crossing through upper mantle-crust NE and crust NW breaks, where the magmatic formations are intensively shown in different depths of formation, field and zone of hydrothermal-metasomatic transformed rocks, endogenous ore accumulation. It is distinguished by geological-structural, aerospacedistanced datа, local geophysical and geochemical anomalies.

In the work the results of compression resistance tests of cement soil samples of various initial densities of a skeleton and the cement composition for the time period from 7 to 60 days are discussed. It was established that the influence of initial density of a cement soil skeleton on resistance of compression is insignificant for the initial 7 days. Increase of intensity to resistance of compression in time is observed for the time interval from 7 to 28 days. In the range from 28 to 60 days decrease in intensity of increase of soil samples compression strength was observed. The greatest intensity of strength increase in time on compression test at the optimum structure of cement soil (the cement of 7%) and the maximum compacted conditions were registered. Standard strength on compression (28 days) of cement soil makes only a part of the general strength.

The present study is focused on the zonal distribution of Eocene deposits from the borehole materials of «Langjar 2» (South-East Armenia). Studying the area and analyzing 35 plankton Foraminifera species several zones have been revealed. Morozovella aragonesis and Acarinina pentacamerata (Lower Eocene), Acarinina bullbrooki, Ac. rotundimarginata, Hantkenina alabamensis, Orb. beckmanii and Truncorotaloides rohri (Middle Eocene), Globigerapsis semiinvoluta and Globorotalia cocoaensis (Upper Eocene). By benthonic Foraminifera the following zones have been revealed: Heterolepa eocaena, Uvigerina costellata-Cibicidoides landjaricum (Middle Eocene) and Planulina costata (Upper Eocene). According to our data the last zone is divided into two subzones – Cibicidoides truncatus and Heterolepa pygmea.

In the work it has been discussed and analysed the moistening regime of the region. Using observed data of deficit and precipitation (1955–2000), we have exposed the number of regularities of spatio-temporal changes. As a result a map of spatial distribution is created.

In the article the possibility of qualitative estimation of relief conditions on the basis of morphometrical data is considered. The examples received as a result of study of maps drawn up, using GIS-technologies are given. The middle quantitative data of the scale of a legend of each map were taken as favourable conditions and marked by zero, and upstream and downstream data were taken correspondingly for 1 and –1. The received data were summed up and classified into four groups and the corresponding map of complex qualitative estimation of relief conditions was drawn up.