Lithologic-mineralogical investigations during diamond-prospecting work

Abstract

On the example of Paleozoik and Mesozoic deposits of one of the main diamondiferous regions of the Siberian platform basic suppliers of terrigenous material to ancient diamondiferous placers under formation and their occurrences are characterized. Special attention is paid to characteristics of local sources of allothigenous material removal to sedimentation basins of the said period, the main of which were of Upper Devonian-Carboniferous crusts of Middle-Late Triassic crusts of weathering on terrigenous-carbonate rocks, formations of trappean origin (dolerites, tuffs, tufogene thick layers) and kimberlites.That is why redeposited in ancient sedimentary thick layers products of various types of crusts of weathering preserve structural and chrystallochemical features in relation to the minerals of eluvial thicknesses, which allow tracing the ways of terrigenous material arrival into sedimentation basins (including diamondiferous material).