Genesis of authigenic carbonates in Quaternary sediments and soils of Danube Lowland I.

Carbonates authigenicsis is epigenetic geochemical process which leads to the excretion (neoformation) of carbonates in host sediments and soils indepedent on their genesis. It is applied on places where are suficiently high contents of calcium in pore- or groundwaters, and suitable evapotranspiration landscape potential. Due dual approach to their study (pedological and geological) is one of the causes of many ambiguities around nomenclature, classification, interpretation of the genesis of authigenic carbonates and in recognition of their pedogenetic and geochemical significance. An essential factor of authigenic carbonates formation is sufficiently high concentrations of calcium in pore- and groundwaters and suitable climatic conditions that affect water evaporation. The role of authigenic carbonates is disscussed; the majority of authigenic carbonates is a mixture of several morphological, or transitional types. Soil classification and spatial distribution of soils (soil toposequences on loess), as well as soil pedogenesis in alluvial and loess´parent material is processes with proposal on the new classification criteria involvement.