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Original carbonaceous material of fossile carbon plants from the divisions of the Equisetophyta (Calamariaceae), Lycophyta (Lepidodendraceae, Sigillariaceae), Filicophyta (Filicatae), and Spermatophyta (Pteridospermatae, Cordaitidae) was analyzed by atomic absorption spectroscopy on its content of the trace metals vanadium and nickel. The average V-content was found to be 10 to 100 fold higher than that of the neighbouring coal beds or that of the embedding materials, while the Ni-concentrations were found to be almost in the same range. The highest contents of V and Ni were found in the Calamariaceae and in the Pteridospermatae. The V-and Ni-contents of the fossile carbon plants are compared to those of related recent plant genera (clubmosses, horse­ tails, ferns), which were analyzed by 46 representative samples. A possible biogenous enrichment of V and Ni in plants of the carbon age is discussed.

zeitschrift für naturforschung c

Zur Frage biogener Anreicherungen von Vanadium und Nickel in Pflanzen des Karbonzeitalters / The Question of Biogenous Enrichments of Vanadium and Nickel in Plants of the Carbon Age