Amino acid racemization dating

Amino acid racemization (orAAR) is the interconversion of amino acids from one chiral form (the L - (laevo) amino acids which are the building blocks of proteins) to a mixture of L- and D- (dextro) forms.

Amino acid racemization dating of Upper Pleistocene - Holocene

The ratio increases with time and temperature until the rate of formation of D-amino acids is compensated by the reverse reaction, and the ratio reaches an equilibrium value of 1.0. Two general approaches are used to convert D/L ratios to.

Amino acid racemization dating

For example, a kinetic model is used to estimate the age of an undated sample by extrapolating beyond a calibration point, or a calibration curve developed for one thermal regime is applied to another using a kinetic model to adjust.

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Amino acid racemization dating

Kaufman, D.S., 2003b, Amino acid paleothermometry of Quaternary ostracodes from the Bonneville Basin, Utah: Quaternary Science Reviews 22, 899-914. McCoy, W.D., 1987, The precision of amino acid geochronology and paleothermometry: Quaternary Science Reviews 6, 43-54.

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