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• W2051250773 abstract "Thirty-eight fossil coral samples of known age from late Pleistocene uplifted reef terraces have been analyzed for amino acid composition and for the degree of racemization of selected amino acids. Particular attention has been given to the epimerization (racemization about the α-carbon) of isoleucine. The DL ratios observed in many of these samples do not conform to the concept of increasing racemization being associated with increasing fossil age. It is shown that sixteen of the samples demonstrate concordance between their known age and the age estimated from racemization data. Racemization ages are based upon a kinetic model derived from the kinetics observed in foraminifera in marine sediments and published estimates of the temperature dependence of the isoleucine epimerization reaction. Lack of concordance for the remaining samples is explained by either of two separate diagenetic phenomena: extensive leaching of free amino acids from the fossil, or contamination by ‘young’ amino acids. Ambiguities observed in many of the results may be due to the fact that coralline organic matter can have a complex history because of variations in its source and in its relation to the mineral phase. Neither of these factors has been observed to exert such a significant effect on racemization kinetics observed in fossil foraminifera or molluscs. Fossil corals are of only modest value as specimens for amino acid geochronological studies." @default.
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• W2051250773 date "1976-07-01" @default.
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• W2051250773 title "Amino acids in fossil corals: racemization (epimerization) reactions and their implications for diagenetic models and geochronological studies" @default.
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• W2051250773 doi "https://doi.org/10.1016/0016-7037(76)90029-6" @default.
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