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https://doi.org/10.37358/Rev.Chim.1949

OSIM Nr. R102355
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Revista de Chimie (Rev. Chim.), Year 2015, Volume 66, Issue 5,





Bratislav Z. Todorovic
Geochemistry of Ni, Co and Zn in the Calcite Fraction of Organic Rich Layer at Cretaceous - paleogene Boundary from Caravaca (Spain)



Abstract:

Except the enhanced content of total meteoritic Ni (130 ppm), non meteoritic Co (35 ppm) and Zn (105 ppm) in the Caravaca KPB organic rich layer exists and relatively high concentration of these metals in the carbonate/calcite fraction. Geochemical analysis of the toxic Ni, Co and Zn in the carbonate fraction KPB layer at Caravaca (Spain) were undertaken. These metals were chosen primarily because of their relatively simple chemistry in natural waters and a similar geochemical behaviour. In a general discussion of the results, a geochemical model is describing the incorporation of Ni (70), Co (40) and Zn (55 ppm) in the biogenic calcite. We propose that most of the Ni, Co and Zn in this fraction of organic rich layer from Caravaca is of biological Ni, Co and Zn, i.e. the direct biochemical incorporation into the shells of calcerous microbiota during their metabolic uptake of seawater. Also, the origin of Ni is determineted as probably meteoritic, while Co and Zn are mainly of terrestrial origin. Keywords: Cretaceous-Paleogene, Caravaca, calcite, geochemistry


Issue: 2015, Volume 66, Issue 5
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