PLACER GOLD CONTENT IN THE APTIAN–LOWER ALBIAN CONTINENTAL FLUVIAL DEPOSITS OF THE UPPER PALEOFLOW OF KANIV-ZVENYHORODSKA PALEOVALLEY (CENTRAL PART OF THE UKRAINIAN SHIELD)

Abstract

the upper paleocurrent of the Kanіv-Zvenyhorodska paleovalley are given. Typomorphic features of alluvial gold are characterized. A number of digital maps which characterize the placer parameters have been constructed based on the coordinates of the wells, their description and data on the Aptian–Lower Albian de-posits sampling. The distribution of gold content by individual crossings across the paleovalley and the relationship between increased gold content, the bedrock relief and the thickness of gold-containing sediments are established. The maximum placer gold content of Aptian–Lower Albian deposits spatially associates with the erosion of amphibolites crusts of weathering, and downstream it gradually reduces. There-fore, it is possible to predict a larger gold placer upstream of paleoflow in direction to Stebliv. Middle Eocene river paleovalleys inherited Aptian–Lower Albian river paleosystem, thanks to what the chronological transit of a substance (and gold) at higher stratigraphic levels happened. This fact makes it possible to predict placer gold in the Middle Eocene alluvium of Kaniv-Zvenyhorodska paleovalley, in particular, in those areas where Middle Eocene fluvial flows eroded Aptian–Lower Albian gold placers. Therefore, in the survey area during the geological development, the spatial-paragenetical se-ries of different age continental gold placers has been formed: eluvial placers–placers in Aptian–Lower Albian and Middle Eocene continental fluvial sediments. The obtained results complement and clarify ideas about the structure of Aptian–Lower Al-bian gold placers within the up-paleostream of Kaniv-Zvenyhorodska paleovalley. Digital carto-graphic visualization of the gold placers structure is the basis for information support of their in-dustrial development – detailed geological exploration and exploitation.