Fourier-transform Raman spectroscopic studies of chronological change in stromatolitic cores from Antarctic lake sediments
Edwards, H.G.M.; Wynn-Williams, D.D.; Ellis-Evans, J.C.; Newton, E.M.; Little, S.J.; de Oliveira, L.F.C.; Hodgson, D.; Doran, P.T.. 2003 Fourier-transform Raman spectroscopic studies of chronological change in stromatolitic cores from Antarctic lake sediments. International Journal of Astrobiology, 1 (4). 325-331. 10.1017/S1473550403001253Full text not available from this repository. (Request a copy)
The Fourier transform-Raman spectra of two lacustrine sediment cores from Antarctic sites are reported. The Lake Hoare specimens were predominantly calcium carbonate, quartz and β-carotene, with chlorophyll and calcium sulphate being noted as minor components. No evidence was found for iron (III) oxide or oxy-hydroxide bands. The Lake Nella specimens, in contrast, contain chlorophyll and quartz predominantly, but the absence of β-carotene is noteworthy. Here, the presence of haematite and a haematite–goethite mixture have been identified, with weaker features such as those of scytonemin, characteristic of cyanobacterial mats. The Raman spectra indicate that two different types of lake chemistry have been operating and several reasons are proposed for this.
|Programmes:||BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Life at the Edge - Stresses and Thresholds|
|Additional Keywords:||Antarctic, cyanobacteria, Fourier-transform Raman spectroscopy, lacustrine sediments|
|NORA Subject Terms:||Chemistry|
|Date made live:||03 Apr 2012 10:14|
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