Vol. 40 No. 2 (210) (2006)

DOI: https://doi.org/10.46991/PYSUC.2006.40.2
Published: 2006-05-30

Geology

  • Geology

    DISCRETENESS OF ZEOLITIZATION OF SIMMETRICAL-STRIPED DIKES IN JURASIC VOLCANIC FORMATIONS OF ARMENIA

    H. P. Guyumjyan
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    Abstract

    Symmetrical zonality in zeolitical dikes of bazaitoid composition is the result of discrete distribution of zeolites in the area. Discreteness can be noted in the form of leaps of changed zeolite deposition along longitudinal protectonic cracks or hidden flow textures. The main reason for symmetrical zonality to occur in the dikes of Alaverdi and Kapan are fields in the fragmental diffusional metamorphism when zeolitization is developed in capillary-porous environment under the conditions of oriented dislocation of chemical elements along many frontal lines, in this particular case, from central axial parts of dikes to contact surface perpendicular to the planes of longitudinal pretectonic cracks. Textures fixed by zeolitization are inherited from primary magmatic hidden flow textures of externally massive homogenous dikes. Black and white vertical exfoliation in rythmic striped dikes, based on the alternation of zeolitized (metasomatic newly formations) and relictic (unchanged primary rocks) zones in essence heterogenous is the result of magmatic and metasomatic processes.

    References
  • Geology

    ON THE PECULIARITIES OF THE PALEORELIEF STRUCTURES OF VOLCANIC UPLANDS (on the pattern of Aragats massif)

    V. P. Vardanyan, S. R. Minasyan
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    Abstract

    Extraordinary diversity of physiographic conditions and complicated geological and tectonic structures are typical for volcanic structures that result in non-uniformly distribution of ground water resources and variety of its composition and mineralization. The thick volcanic blankets and streams covering the buried topography complicate ground water prospecting problems in volcanic regions in comparison with any other geologic regions. These circumstances complicate carrying out of hydrogeological (and engineering geological) works and it is necessary to apply other prospecting methods and first of all the geophysical ones. In the article have been discussed ground water resources evaluation and regularities of ground water run-off distribution on the pattern of Aragats volcanic upland. Inner and under lava water streams, buried watersheds have been distinguished. Compiled cartographic materials can be applied in ground water prospecting works in the areas of investigated river basins.

    References
  • Geology

    ON SOME QUESTIONS FOR HORIZONTAL DRAIN CALCULATION

    Zh. A. Achoyan, V. Zh. Achoyan, O. A. Avetisyan
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    Abstract

    Based on summarizing and processing the multiyear test data on desalination and agricultural developing of solonetz-solonchak soils against a background of horizontal drains (the key terrain is located in Ararat Valley), empirical formulae have been derived that allow to calculate the horizontal drain parameters. It greatly reduces the financial expenses necessary for exploration work and implementation of experimental filtration research aiming at determination of filtration and capacity parameters of the grounds.

    References
  • Geology

    THE ECOLOGICAL SITUATION OF THE ARARAT BASIN AND RATIONAL USAGE OF ITS SOIL RESOURCES

    R. Kh. Gaginyan, P. G. Davtian, G. P. Davtian
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    Abstract

    The modem ways of exploitation of soil and water resources of the Ararat basin are a good basis to suppose that in the near future new soil layers will be thrown out of the agricultural usage because of their second salting and swamping. A new type of scientifically grounded drainage-meliorative activities which will basically change the ecological state of the basin is suggested.

    References