Radiocarbon dating pedogenic carbonates

Considering the origin, formation processes and morphology, carbonates in soils are categorized into three groups: geogenic carbonates (GC), biogenic carbonates (BC) and pedogenic carbonates (PC).

2006 Australia) Radiocarbon dates from pedogenic carbonate in the southern Strzelecki Desert of South Australia are several thousand years too young, a conclusion contrary to previous work which suggested dates on such material were reasonably reliable within the semi-arid zone, or several thousand years too old in the arid zone.C ages should only be considered as estimates and not absolute ages because of the possibility of open-system behaviour with respect to carbon.– Sediments are complex systems containing carbon of multiple forms, sizes ranges and sources.The following climatogenic evolutionary phases of pedogenesis were distinguished: (1) formation of microsparite–micritic dense silica-containing coatings due to short-term fluctuations of the shallow alkaline bicarbonate groundwater level in the semiarid–arid climate; (2) formation of sparitic dense coatings under the slow accumulation of carbonates from low-mineralized bicarbonate water at the higher lake level as compared to the present one in the less arid conditions; (3) the eluvial-illuvial formation of micritic loose coatings under stable automorphic semiarid conditions; (4) formation of Fe-humus coatings in cool humid climate (Al–Fe-humus phase of pedogenesis); (5) the recommencement of the eluvial-illuvial formation of micritic loose coatings under aridization of the last thousand years of the Holocene. Cherkinsky, 2017, published in Pochvovedenie, 2017, No.

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