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Raman and cathodoluminescence spectroscopic investigations on Permian fossil wood from Chemnitz—a contribution to the study of the permineralisation process by Klaus Witke; Jens Götze; Ronny Rößler; Dagmar Dietrich; Günter Marx is a Chemistry article available to read on EtoBox.

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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 yellowbrownish 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 ␣-quartz as well as microcrystalline moganite, both partially associated with iron oxides. Dadoxylon sp. is a prominent example for parallel permineralisation by ␣-quartz and fluorspar, wh

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Author

Klaus Witke; Jens Götze; Ronny Rößler; Dagmar Dietrich; Günter Marx

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Pergamon Press Ltd.; Elsevier BV (ISSN 1386-1425)

Published

2004

Language

EN

Field

Chemistry (Physical Sciences)