CORRELATION ANALYSIS OF THE THICKNESS OF SEDIMENTS IN THE NORTHERN PART OF THE UKRAINIAN SHIELD

Abstract

This article presents correlation between the thickness of sediments and sedimentary rocks and other values in the context of the two territories situated on the Novohrad Block of the Volyn Megablock and on the Fastiv Block of the Rosynsk-Tikych Megablock of the Ukrainian Shield. The geomorphologic differences between them have been determined. when conducting the research, descriptions of all the geological surveying wells, drilled on those territories, as well as the method of pair correlation analysis have been used. The correlation between the thickness and the spreading of the sediments and sedimentary rocks, which are present in the heterochronous sedimentation formation, has been established. Sometimes, the thickness of the heterochronous masses correlates to their spreading. So, for example, in the Fastiv Block those parameters regularly go up in the series Paleogene – Neogene – Quaternary deposits and show a sufficiently strong correlation. It has been proposed to apply the non-graded sedimentation formation coefficient. when applying the latter, we see the regularity as follows: when the non-graded sedimentation mass coefficient goes down, the correlation relationship between average thickness and spreading of graded sediments regularly goes up. Unlike with the researched territory of the Novohrad Block, in the sedimentary cover of the Fastiv Block there is seen deposit of brown coal, secondary kaolins, placer deposits of minerals. Such difference between the Blocks comes with different, sometimes opposite, coefficients of correlation between the sedimentary cover thickness and the absolute heights of the daylight surface and crystalline basement, the oscillation amplitudes of the latter, the average thickness of the sedimentary cover and particular sediments, their spreading, the relative and absolute content of relatively well-graded sediments. This indicates that unpromising and more promising areas have significantly different quantitative geomorphologic and statistical values; therefore the perspectivity of the areas can be calculated in theory mathematically. Further research in this direction on other territories of the Ukrainian and other shields can be promising, and the correlation analysis can be more extensively applied in the sedimentology than it is now.