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        Carbonate Coatings on Plant Twigs Found from a Travertine-Depositing Small Stream, Dijon, France

        이성주,공달용,Stjepko Golubic 한국지구과학회 2014 한국지구과학회지 Vol.35 No.5

        A number of coated grains (spherical to elongated ones in shape) were collected from a small stream, Dijon,France. They were characterized by typical concentric lamination surrounding broken twigs, and were thus identified asconcentric precipitation on plant twigs. Within carbonate coatings of the plant twigs, two morphological groups including,eukaryotic green algae (Vaucheria sp.) and cyanobacteria (Scytonema sp. and Rivularia sp.) were detected, which formcarbonate crystals that are surrounding their filaments. The filaments could have triggered carbonate precipitation byphotosynthetic removal of CO2 causing the increase of alkalinity of the water, and by supporting their sheaths asnucleation sites. Such encrusted twigs were found from 70 meters downstream, in which temperature and pH weremeasured as 11.1oC and 8.18, respectively. These water chemistries (11.1oC and pH 8.18), with the aid of microbialphotosynthesis, were likely to provide a suitable condition for carbonate precipitation on the twigs.

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