Origin, distribution and transformation of authigenic carbonates in loessic soils

Authors : Martin KOLESÁR, Ján ČURLİK

Pages : 38-43

Doi:10.18393/ejss.50910

View : 42 | Download : 10

Publication Date : 2015-01-08

Article Type : Research Paper

Abstract :Processes of authigenic carbonates formation are component part of terrestrial biogeochemical cycle of carbon, which starts with co-accumulation of oxalic acid and Ca in Ca- oxalates. After plant decay are these biominerals slowly transformed under the influence of microbial processes into authigenic carbonates insert ignore into journalissuearticles values(calcites);, depending on soil condition. The formation of authigenic calcites runs over in soil system where is rather high Ca and Mg concentration, presence of oxalomorphic plants and sufficient oxalotrophic stability of microorganisms. In addition to Ca-oxalates, Ca and Mg ions necessary for carbonate formation comes also from air insert ignore into journalissuearticles values(precipitation, dust);, mineral weathering, subsurface water flow and decaying organic matter. The distribution pattern of authigenic calcites with depth, the size and shape of individual forms of calcites on loessic soils of SW Slovakia, as it is resulted from micromorphological study indicate that through the historical development of that soils as landscape units, soil water regime has played decisive role at vertical redistribution of forms insert ignore into journalissuearticles values(size, shape); of authigenic calcites. To this witness the depth of variation of needle calcite zones and horizons of micritic calcites occurrence depending on soil types insert ignore into journalissuearticles values(leaching);. Needle shape calcite zones which approach closest to the soil surface, gradually coalescence to the horizons of micritic calcites with the depth. Micritic calcites are without, or with microsparitic domains. Our study concurrently support the ideas of their inorganic origin depending on evaporitic soil regime. This formations have its own historic dynamics on which depends also the preservation of calcaric nature of soils.
Keywords : Authigenic carbonates, oxalate carbonate pathway, needle shaped calcites, micritic calcites, loessic soils, micromorphological aspects

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