Saturation transfer EPR (ST-EPR) for dating biocarbonates containing large amount of Mn2+: Separation of SO3 - and CO 2 - lines and geochronology of Brazilian fish fossil

  • Sastry M
  • Andrade M
  • Watanabe S
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Abstract

A method using saturation transfer EPR (ST-EPR) is shown to be feasible for detecting EPR signal of radiation-induced defects in biocarbonates containing large amount of Mn2+. The ST-EPR measurements conducted at room temperature on fish fossil of Brazilian origin, enabled the identification of CO2-and SO3-radical ions, by partially suppressing the intense signal from Mn2+when the signal are detected 90° out of phase with magnetic field modulating signal and at high microwave power (50 mW). Using these signals the age of fish fossil is estimated to be (36±5) Ma. © 2003 Elsevier Science Ltd. All rights reserved.

Author-supplied keywords

  • Fossils
  • Geochronology
  • ST-EPR

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Authors

  • M. D. Sastry

  • Marcelo B. Andrade

  • Shigueo Watanabe

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