Computer Science
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001gecoa..65..885b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 65, Issue 6, pp.885-900
Computer Science
1
Scientific paper
Two Estonian Kukersites (Ordovician) and two samples from the Guttenberg Member (Ordovician) of the Decorah formation (North America) containing botryoidal aggregates of Gloeocapsomorpha prisca were investigated by RuO 4 chemical degradation, FTIR, and flash pyrolysis-GC/MS to obtain information about the polymeric structure of these microfossils. The products formed upon oxidation by RuO 4 were analysed by GC/MS and revealed the presence of a wide range of carboxyl and/or carbonyl moiety containing compounds with carbon skeletons ranging from C 5 to C 20 . The Estonian Kukersites reveal the presence of a characteristic set of mono-, di-, and tricarboxylic acids. These compounds suggest that the Estonian Kukersites are composed of a polymer consisting of mainly C 21 and C 23 n -alkenyl resorcinol building blocks. Similarly, although the tricarboxylic acids are not present, the RuO 4 degradation product mixtures of the Guttenberg Member samples, suggest a poly( n -alkyl resorcinol) structure. The higher thermal maturity is most likely responsible for the different chemistry and morphology of the G. prisca microfossils in these samples. Because compounds like n -alkenyl resorcinols are known to polymerise under oxygenated conditions even in an aqueous environment, it is not per se necessary that these microfossils are composed of a selectively preserved biopolymeric cell wall. It is also possible that G. prisca microfossils are composed of a cell wall or sheath component that polymerised during senescence or diagenesis of the organism.
Blokker Peter
Collinson Margaret E.
de Leeuw Jan W.
Pancost Rich
Sinninghe Damst'e Jaap S.
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