Use of [Pb-Pb]3+ center of the amazonite for dating.
In the present work, dating of one type of amazonite sample using the [Pb-Pb]3+ dimeric center is carried out by electron spin resonance (ESR). The thermal stability of the center is investigated using isochronal annealing at several temperatures from 200 to 500 degrees C for 15 min. Using isothermal annealing, the lifetime of the center was also estimated. The extrapolation of the straight line in the Arrhenius plot gives a lifetime of approximately 0.25 Ma at room temperature. The age obtained from sample was 90 ka.
Mittani
J C R
JC
Institute of Physics, University of São Paulo, CP 66318, 05315-970, São Paulo SP, Brazil. Juan.mittani@dfn.if.usp.br
Cano
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NF
Watanabe
S
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