HYDRODYNAMIC ASPECTS OF THE HYDROGEOLOGICAL CYCLIC RECURRENCE

Abstract

geologo-tectonic and thermal rythms of the Earth were considered as the basis for the understanding of its geological plan by many scientists, i.e. R. Descartes, G. Leibnitz, T. Bernet (17-18 centuries), M. V. Lomonosov, J. Buffon, I. Kant (Second half of the 18-th century) and other researchers. geologo-tectonic criterion serves as a means of showing the changes which take place in the body of the planet under the influence of the outer and inner forces. quantitative relations of these forces in the historical process of transformation of the Earth's matter are the problem obscurum in obscuriore. tectonic development of the Earth, as is known, falls into three consecutive megacycles: pregeosyncline-platform geosyncline-platform and recent activisation. general oscillatory cycle recurrence, connected with the wave thermal oscillations, determines the cycle recurrence within these megacycles ([1] and others). At present it is considered [5], that the basis for the creation of a single chronological scale of the cryptozoic can be the method of standards (stratotypes) or structural-matter complexes. This method, in its general form, can be also applied when dividing the phanerozoic. As marked by A. N. Semikhatov [7]: The reconstruction of the geological history of ground waters is faced with great difficulties, which lie in the nature of the studied object itself. In fact, if for geotectonics it is possible to determine regular qualitative and quantitative relations between deep processes and their surface manifestations (for instance, folding), the hydrogeological connection of such a type, as a rule, is obscured by extreme mobility of waters. deep hydrogeological cyclic recurrence, associated in some way with the mechanisnl of melting of the crust from the upper mantle [1, 3], has, therefore, a principal difference from the surface (within the sedimentary cover and the granite layer), lateral hydrogeological cyclic recurrence. Different researchers, when analysing the studied problem, generally arrived at similar conclusions as regards the connection between the oscillatory movements of the Earth's crust and the hydrogeological cyclic recurrence. However, no precise space and time determinations were made of hydrogeological cycles. All mentioned above suggests a thesis that in the geosyncline-platform megacycle the deep (vertical) hydrogeological cyclic recurrence is expressed through the lithologoformation factor in the surface (horizontal) hydrogeological cyclic recurrence. geosyncline-platform hydrogeological megacycle is divided into the Riphean (Baikal), Caledonian and Hercynian hydrogeological cycles within the volume of the corresponding structural-matter complexes. In the light of the problem of the hydrogeological cyclic recurrence an important regularity appears to be the relation between the geologo-tectonic division sedimentary coverfolded foundation and geochemical division of fresh and mineralised waters, which is fornlally determined by the content of CI ' 40 mgjl in ground waters and general mineralisation (1 gil) [2]. amplitude and the period of oscillation of such a hydrogeological division (see fig. -), reflecting the horizontal hydrogeological cyclic recurrence, depend on particular reasons, but should remain the same for coeval structures, i.e. they should be determined by anlplitude and period of oscillation of the vertical hydrogeological cyclic recurrence connected with the levels of instability in the tectonosphere. position of the mineralised waters in the subsidence and on the massive is associated with the warping of the Earth's crust and squeezing out of salt