Origin of Ordovician diasporites of Central Kazakhstan

Geological, mineralogical, and petrographic compositions of the Taskol' diasporites are considered. Diasporitization along the contact of underlying limestones and overlying fused tuffs of alkali andesite basalts resulted from volcanosedimentary processes. Earlier, researchers related its formation to the effect of climate and weathering, But we have established that it developed under specific PT-conditions under the effect of volcanic gases enriched in Al3+, which was concentrated in the pores of elastic rocks and washed out by sea waters.