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Geoinformatika 2016; 3(59) : 49-57  (in Ukrainian)

A DIGITAL STRUCTURAL-LITHOLOGICAL MODEL OF LOWER CRETACEOUS CONTINENTAL ALLUVIAL ILMENITE PLACERS OF TOP PALEOSTREAM WITHIN THE LEBEDYN-BALAKLIIА PALEOVALLEYS (CENTRAL PART OF THE UKRAINIAN SHIELD)

Yu.V. Kroshko

Institute of Geological Sciences, NAS of Ukraine, 55B О. Gonchar Str., Kyiv 01054, Ukraine, e-mail: tamagoji.79@mail.ru

The purpose of the article is to give a detailed presentation of building digital structural-lithological models of the Apt-lower album continental placers of top paleostreamilmenite of the Lebedyn-Balakliapaleovalleys; based on these coordinates, to describe wells and definitions of the ilmenite content with the view to build digital structural-lithological models of the continental lower Cretaceous placers of ilmenite, which would reflect the character of the sediments roof and surface, the productive capacity of lithotypes, and the spatial distribution of the content of the useful component.
Design/methodology/approach. Built with the help of GIS technology, the digital structural-lithological models of the most promising alluvial ilmenite enable us to visualize the actual material, to locate within the areas the placers with the highest content of ilmenite, and to examine their relationship with paleorelief, the identified microfacies, lithofacies, and their capacity.
Findings. Within the upper paleostream of theLebedyn-Balakliiаpaleovalleys, we have identified increased ilmenite in crystalline basement rocks (mainly in rocks of basic composition), in their weathering crust, as well as in continental and coastal marine sediments of various ages. The most striking spatial and paragenetic relationship of exogenous ilmenite with endogenous sources (basic rocks) has been is found in the ilmenite weathering crust and continental and coastal sediments of the Lower Cretaceous (the concentration of ilmenite in productive strata decreases with the distance from ilmenite basic rocks and their weathering crust ). For prospective areas in the ilmenite continental Lower Cretaceous sediments, we have built digital structural and lithological models to characterize the structure and distribution of productive strata of ilmenite in different facies. The validity of the constructed models was confirmed by comparing them with the actual data of description and testing of wells, which allows us to assess the efficiency of the digital structural and lithologic modeling. Thus, the upper portion of paleostream of theLebedyn-Balakliapaleovalleys is promising and attractive for investment and development of ore occurrences and deposits of ilmenitewith small.
Practical value/implications. Spatial and paragenetic combination of ilmenite basement rocks with ilmenite weathering crusts and the products of their erosion and re-deposition (by Lower Cretaceous continental and coastal-marine formations) permits to select the site as an attractive investment. Digital structural and lithological models of the most promising ilmenite placer built with the help of GIS technology enabled us to visualize the actual material, highlight within the placer the areas with the highest content of ilmenite and clarify their relationship with identified paleoreliefmicrofacies, lithofacies and their capacity. Digital structural and lithological models and their derivatives appear to provide the key basis of support in mining activities.

Keywords: central part of the Ukrainian Shield, Lower Cretaceous, deposits, ilmenite, digital structural-lithological model.

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