Науковий вісник НГУ

Prospects for diamond content in Raygorodska strata of the Ukrainian shield

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Category: Geology

Last Updated on 02 April 2016

Published on 02 April 2016

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Authors:

M.V. Ruzina, Dr. Sci. (Geol.), Professor, State Higher Educational Institution “National Mining University”, Professor of the Department of Geology and Mineral Prospecting, Dnipropetrovsk, Ukraine.

O.A. Tereshkova, Cand. Sci. (Geol.), State Higher Educational Institution “National Mining Uni-versity”, Senior Lecturer of the Department of General and Structural Geology, Dnipropetrovsk, Ukraine.

N.V. Bilan, Cand. Sci. (Geol.), Associate Professor, State Higher Educational Institution “National Mining University”, Senior Lecturer of the Department of General and Structural Geology, Dnipropetrovsk, Ukraine.

N.G. Vunda, State Higher Educational Institution “National Mining University”, postgraduate student, Dnipropetrovsk, Ukraine.

Abstract:

Purpose. To evaluate the prospects for diamond content in Raygorodska strata of the Ukrainian shield.

Methodology. A complex of field and laboratory tests was used to achieve the purpose of the research. Petrographic and mineragraphic studies, paleogeographic reconstruction and lithofacies analysis were carried out.

Findings. It has been found that the diamondiferous rock of Raygorodska strata refers to the marginal-marine type of sedimentary and pyroclastic group of rock. Diamondiferous bedrock processed by breaking waves and its alluvial migration from the continental surface can be considered as a possible source of incoming diamondiferous debris. Formation of marginal-marine diamond-bearing facie of Raygorodska strata is due to the peculiarities of paleogeography of the periphery of the Paleocene Sumy marine basin. Fluidized-explosive unit spatially related to Raygorodska strata has been discovered. This unit is similar in composition to diamondiferous mica-lamprophyre of Minette type from Parker Lake area, Canada, as well as to diamondiferous rovnenskits of the Ukrainian shield. The occurrence of diamonds set earlier in raygorodska strata is similar to pyroclastic kimberlites from the Fort à la Corne area (Saskatchewan, Canada) and to mineragenic type of pyroclastic kimberlite accumulated in shallow marine basins.

Originality. Fluidized-explosive unit and the peculiarities of lithofacies and stratigraphic position of raygorodska strata have been revealed. The potential diamond content of fluidized-explosive unit was substantiated. Mineragenic type of previously established occurrences of diamonds has been proved; the probable directions of transport and accumulation areas of diamond detritus of Raygorodska strata have been determined.

Practical value. New forecasting and prospecting criteria for diamond content in raygorodska strata have been formulated. These criteria allow extending the boundaries of the Kirovohrad area in the Central diamond prospective region and delineate potentially diamond placers.

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