Raman and cathodoluminescence spectroscopic investigations on Permian fossil wood from Chemnitz--a contribution to the study of the permineralisation process

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Klaus WitkeGünter Marx

Abstract

Samples of different three-dimensionally preserved fossil plants (Medullosa sp., Dadoxylon sp., Calamodendron striatum, Psaronius sp.) from the Lower Permian petrified forest of Chemnitz were examined with regard to their chemical composition and structural order. Raman spectroscopy and cathodoluminescence microscopy are shown to be powerful tools for such investigations. Silicified wood from Chemnitz-Hilbersdorf generally shows yellow cathodoluminescence (CL) of the cell walls and only weak yellow-brownish CL of the cell lumina. By time-resolved cathodoluminescence spectroscopy, a secondary mineralisation of hydrothermal origin was recognized. The latter is shown by short-lived blue CL at the cell walls extinguishing the yellow signal. Therefore, after the primary silicification step a secondary mineralisation step initiated by hydrothermal processes, seems to have taken place at probably slightly higher temperatures. The resulting silica matrix consists of phanerocrystalline and microcrystalline alpha-quartz as well as microcrystalline moganite, both partially associated with iron oxides. Dadoxylon sp. is a prominent example for parallel permineralisation by alpha-quartz and fluorspar, which is outstanding for the Chemnitz Pe...Continue Reading

References

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Feb 7, 2001·Proceedings of the National Academy of Sciences of the United States of America·A B KudryavtsevT J Wdowiak
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Jun 29, 2002·Proceedings of the National Academy of Sciences of the United States of America·André KempeWolfgang M Heckl

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Citations

Mar 9, 2011·Diseases of Aquatic Organisms·Nolwenn TrinklerChristine Paillard
Oct 19, 2005·Journal of Biomedical Optics·Shuping XuYukihiro Ozaki
Jul 31, 2018·Applied Spectroscopy Reviews·Notburga Gierlinger

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