GIRKAN STAGE IN THE DEVELOPMENT OF THE CASPIAN SEA

G. I. Rychagov

doi:10.15356/0435-4281-2016-1-3-17

GIRKAN STAGE IN THE DEVELOPMENT OF THE CASPIAN SEA

G. I. Rychagov

https://doi.org/10.15356/0435-4281-2016-1-3-17

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Abstract

Analysis of data on relief and geological structure of the continental part of the Dagestan coast of the Caspian Sea, and especially, aging of sediments of marine terraces by faunal data (shells) confi rm the existence of the independent Girkan stage of the sea development. Girkan transgression occurred in the time interval between Late Khazar and Early Khvalyn transgressions. As a result of the abrasion activity of Girkan transgression the topography of the coastal lowland and its morphological boundary with the foothills of the Greater Caucasus were fi nally formed. The boundary has an altitude of 100–105 m and 120–130 m. These altitudinal differences arose as a result of tectonic movements and accumulation of slope and alluvial-proluvial sediments at the foot of the escarpment separating the coastal plain from foothills. The Late Khazar and Girkan transgressions occurred in different climatic conditions: fi rst, in the era of MIS-5e (interglacial), second in MIS 5d-5a with repeated alternations of warming and cooling.

Keywords

гирканская трансгрессия, разломная тектоника, геоморфологический анализ, дивергенция

About the Author

G. I. Rychagov

Lomonosov Moscow State University
Russian Federation
Faculty of Geography

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Review

For citations:

Rychagov G.I. GIRKAN STAGE IN THE DEVELOPMENT OF THE CASPIAN SEA. Geomorfologiya. 2016;(1):3-17. (In Russ.) https://doi.org/10.15356/0435-4281-2016-1-3-17