Vol. 45 No. 1 (224) (2011)

In this article the investigation results of the origin of red pigment of Low Red Formation in Central Iran (Low Oligocene) have been discussed. That is continental and consists of conglomerate, sandstone, marl and claystone. This Formation is unconformably overlain by marine Oligo-Miocene Qum Formation. Mineralogical composition and textural properties of the studied layers show that the Low Red Formation was not red when deposited, although some parts of red pigments were derived from the sedimentory region. This study clearly shows that both detrital and diagenetic pigments contributed in red coloring of the formation but diagenetic processes were more significant.

Aerospace investigation methods in the first place are known as methods of remote sounding of earth surface. At decoding the remote data of ground water occurrence and distribution conditions, it is advisable to distinguish the following hydrodynamic zones: zone of intense water cycle (upper floor); zone of difficult water cycle (middle floor); zone of highly difficult or absent water cycle (lower floor).

According to the results of lithogeochemical soil sampling within the Pkhrut uranium ore field besides uranium anomalies secondary dispersion halos of gold and associated indicator-elements were revealed. Application for the assessment of these halos, three dimensional geochemical modelling of some known (standard) deposits has been used and it permitted to select two promising anomalies of gold.

During the reconnaissance of column drilling, it has been observed that comparing the cost of one meter drilling run off, it is necessary to use different new technical means for additional outcrop. Using contemporary cataclastic reverse circulation machine-tools, we have concluded that it brings to high productivity in getting outcrop.

Geological-geographical peculiarities of the district of Halidzor–Tatev ropeway construction has been described. The appraisal of geomorphological and engineering-geological conditions for determination of stability of areas for construction of stations (terminals) and piers of the ropeway is given.

This work studies and analyses the regularities of spatial-temporal distribution of spring flood characteristics of the Marmarik River basin. For that purpose, the results of observations at water-measuring observation posts (the Marmarik River–Hanqavan Observation Post, the Marmarik River–Aghavnadzor Post, the Ulashik River–Artavaz Post, the Gomur River–Meghradzor Post) were collected, processed and evaluated for the period of 1936–2008. Close correlation links have been established between the average balanced height and flood runoff layer, the duration of high-water period. A map of spatial distribution of runoff layer of the flooding period (mm) has been drawn; runoff layer growth can be observed by height. According to the findings, in the Marmarik River basin there is tendency of flood runoff decrease, the start of flooding has shifted to winter period, its end-towards summer, depending on the growth of the air temperature in the basin. The complete study may serve as a basis for forecasting the flood runoff of the basin.