Organic Geocheistry of Artificially Matured Conodonts

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Show simple item record Wilson, M.A. en_US Marshall, C.P. en_US Nicoli, R.S. en_US Mar, G.L. en_US 2009-11-12T04:41:22Z 2009-11-12T04:41:22Z 2001 en_US
dc.identifier 2004004619 en_US
dc.identifier.citation Marshall, C. et al. 2001 'Organic Geocheistry of Artificially Matured Conodonts', Organic Geochemistry, vol. 32, no. 9, pp. 1055-1071. en_US
dc.identifier.issn 0146-6380 en_US
dc.identifier.other C1 en_US
dc.description.abstract Organic geochemical methods for conodont analysis have been developed. Coniform elements of the conodont genus Drepanodus from the Ordovician Emanuel Formation and pectiniform elements of the conodont genus Polygnathus from the Devonian Napier Formation both from the Canning Basin, Australia have been shown to contain different organic matter. Both conodont samples have been artificially matured and the structure of organic matter present related to the conodont alteration index (CAl) and maturation temperature (TM). The carbon Is X-ray photoelectron spectra (XPS) acquired from both sample sets contain six peaks. These peaks are assigned to highly ordered graphitic like carbon (282.9 eV), sp3 hybridised carbon bonded to only carbon or hydrogen (284.7 eV), ether (286.1 eV), alcohol (287.0 eV), carbonyl (287.6 eV) and carboxyl (289.0 eV) functional groups. Alkene and aromatic carbon is also probably present but is difficult to delineate. During artificial maturation, XPS analysis monitors the main chemical modifications expressed by the carbon-oxygen functional groups. The first stage of maturation begins with the removal of carboxyl and alcohol groups before a CAl of 2 (TM 450 QC).Between a CAl of 3-6 (TM 450-800 QC)an increase of Sp3 hybridised carbon bonded to only carbon or hydrogen is found, which is accompanied by a decrease in ether and carbonyl functional groups. From a CAl of 6-7 (TM 800-950 QC),Sp3 hybridised carbon bonded to hydrogen or carbon and carbonyl decreases while the development of highly ordered graphitic like carbon is observed. The first order laser Raman spectra recorded for both sample sets show a low degree of structural order from a CAl of 2-3, and from CAl 4-6 show a progressive increase in structural disorder of conodont organic matter. The DIG band (band at approximately 1345-1365/band at 1610 cm-¹) line width ratio correlates with CAL Conodont colour during artificial maturation occurs by migration of compounds to the surface. As the nitrogen compounds are volatilised from the surface, colour disappears. en_US
dc.publisher Elsevier en_US
dc.relation.isbasedon en_US
dc.subject Canning Basin (W.A.) en
dc.subject Conodonts. en
dc.subject Organic geochemistry. en
dc.title Organic Geocheistry of Artificially Matured Conodonts en_US
dc.parent Organic Geochemistry en_US
dc.journal.volume 32 en_US
dc.journal.number 9 en_US
dc.publocation Oxford, England en_US
dc.identifier.startpage 1055 en_US
dc.identifier.endpage 1071 en_US Chemistry, Materials and Forensic Sciences en_US

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