Laser Raman micro-spectroscopy of Proterozoic and Palaeozoic organic-walled microfossils (acritarchs and prasinophytes) from the Ghadamis Basin, Libya and Volta Basin, Ghana
Issue title: From Molecule to Tissue: XIII European Conference on the Spectroscopy of Biological Molecules, Palermo, Italy, August 28–September 2, 2009, Part 2 of 2
Affiliations: Université Lille 1, LASIR UMR 8516, Villeneuve d'Ascq, France | Université Lille 1, GEOSYSTEMES FRE 3298 CNRS, Villeneuve d'Ascq, France | Service de Bioénergétique, Biologie Structurale et Mécanismes, IBiTec-S, CEA-Saclay, Gif-sur-Yvette, France | MARUM, Universität Bremen Postfach, Bremen, Germany
Note: [] Corresponding author: M. Vecoli, Université Lille 1, GEOSYSTEMES FRE 3298 CNRS, Bât SN5, F-59655 Villeneuve d'Ascq, France. Tel.: +33 3 20434136; Fax: +33 3 20434910; E-mail: [email protected].
Abstract: Laser Raman microspectroscopy was used as a microchemical analysis technique to characterize the wall chemistry of organic-walled microfossils (acritarchs and prasinophytes) extracted from Proterozoic (Tonian: ca. 900 Myr) and early Palaeozoic (Silurian: ca. 420 Myr) marine sediments in the Volta Basin of Ghana, and the Ghadamis Basin of Libya, respectively. Raman spectra of Proterozoic acritarchs show spectral features characteristic of kerogenous compounds at ~1350 and ~1600 cm−1, consistently with previously published reports. In addition, spectra from prasinophyte algae from the Silurian sample also show an interesting spectral feature at ~1707 cm−1 indicative of carbonyl moieties. Broadly speaking, shape and position of Raman bands appear to depend on the nature of the specimen considered, suggesting that laser micro-Raman analysis can potentially be used to establish phylogenetic relationships (high-rank taxonomy) among the main groups of pre-Cambrian to Palaeozoic palynomorphs.
