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oa Use of spatial morphometric analysis of the Zmiinyi island underwater slope relief to reveal tectonic movements in Holocene
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Geoinformatics: Theoretical and Applied Aspects 2020, May 2020, Volume 2020, p.1 - 5
Abstract
Purpose of the work has been to reveal the features of morphometric characteristics of modern relief of the Zmiinyi Island underwater slope in order to identify the stages of geological development and assess intensity of vertical tectonic movements in Holocene. Methodology. Nautical charts and results of bathymetric surveys down to 30–35 m depth performed in 2009–2015 using echo sounder have been used as the source data for the digital model of underwater slope’s relief. Using the digital model of sea, bottom depths hypsometric curve has been built to establish the generalized values of abrasion benches location depths (used as indicators of ancient coastlines), map of the island underwater slope inclinations and amplitudes of abrasion benches displacement have been determined to estimate the size, sign and speed of vertical tectonic movements. Results. From absolute values of modern depths and ages of abrasion benches, relative deformations of primary horizontal levels of abrasion benches caused by tectonic displacements have been calculated. It has been shown that average speed of relative tectonic movements with negative sign in the north-eastern area of the island in Holocene used to make 0.75 mm/year. Conclusions. Morphometric analysis of the detailed bathymetric studies has revealed correspondence of hypsometric levels of coastal benches between the north-western Black Sea shelf and the Zmiinyi Island underwater slope, which evidences the connection of certain stages of geological development of the Black Sea and the island in the time of Holocene transgression. Assessment of relative deformations of primary horizontal levels of abrasion benches caused by differentiated tectonic displacements of separate blocks has been presented.