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The history of the construction of the quaternary glaciations of the Western Caucasus

Abstract

Introduction: The study of the Quaternary glaciations of the Central and Western Caucasus began at the end of the nineteenth century. taking into account the experience of European scientists to study the Alps. The dynamics of the glaciers of this time were most fully examined by the example of the valley of the left tributary of the Kuban - Teberda. Other areas of the Western Caucasus have been poorly studied. The route studies using geoinformational methods for the interpretation of satellite images provided additional information on other river valleys of the Kuban and hard-to-reach areas of highlands. This allowed to bring to a certain system the magnitudes of the lengths of glaciers of ancient glaciations to distinguish the final stage called the "Little Ice Age". Materials and research methods: In this work, three-dimensional modeling of the studied territories and cartometry were applied to clarify the ield research materials using the calculation of the lengths of linear spatial objects, relief in particular, over a given surface using the ArcGIS 3D Analyst module. SPOT 7 satellite images (spatial resolution of the panchromatic survey in the 1.5 m nadir) and SRTM data were used as material for creating 3D-models of the territories and SRTM data, which were used to construct digital models of the relief of the territories (spatial resolution = 90 m). Research results and their discussion: According to the research results, new information was obtained about ancient glaciations in hard-to-reach areas of the Main and Lateral Caucasus ranges and those areas where these studies were not conducted. These data allowed to systematize the points of view of different authors on this problem. Conclusions: One stage of the Middle Quaternary phase and eight stages of the retreat of glaciers of the Upper Quaternary glaciation phase have been identified. The finite moraine ramparts of the Karakel, Gonachkhir, Amanauz, Alibek and Ptysk stages in the valleys of Teberda and Uchkulan are best preserved. They form a stepped longitudinal proile of the bottoms of the trough valleys that cross the Lateral Ridge. Here, extensive flat areas of the "lake rosary" alternate with steeper sections of the river beds. The moraines of the Dzhemagatskaya and Teberdinskaya stages are not actually preserved and the borders of the glaciers can be conditionally traced only along the "lake rosary". At the same time, a comparative analysis of data on the location of the final staged moraine shafts and the "lake rosary" of the early stages in the studied region showed close values of the distance between the "tongues" of glaciers and the field of nutrition. Traces of the Ptysh and Chotchinsk stages can be traced in all the river valleys of the Greater Caucasus Mountain Range, but not always in their entirety. Cases of the formation of intermediate stage moraines of the Gonachkhir stage in the Uchkulan valley (2 km downstream from the main moraine) were noted. Application of the method of correlation of the stages of the final moraine shafts using the absolute altitudes of the location proposed by GK Tushinsky, turned out to be in demand only within a particular river basin. For example, the final moraine of the Amanauz stage in the glaciation stages, trough valleys, "lake rosary", stage

About the Authors

V. A. Shalnev
North-Caucasus Federal University
Russian Federation


I. Y. Katorgin
North-Caucasus Federal University
Russian Federation


D. V. Yurin
North-Caucasus Federal University
Russian Federation


M. A. Samokish
North-Caucasus Federal University
Russian Federation


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Review

For citations:


Shalnev V.A., Katorgin I.Y., Yurin D.V., Samokish M.A. The history of the construction of the quaternary glaciations of the Western Caucasus. Science. Innovations. Technologies. 2019;(1):65-76. (In Russ.)

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ISSN 2308-4758 (Print)