Molecular activation analysis for iridium

  • C. F. Chai
  • P. Kong
  • X. Y. Mao
  • S. L. Ma
Activation Analysis Techniques and Applications


Molecular activation analysis (MAA) of iridium in geological samples, based on a combination of a newly-developed chemical sequential dissolution method and radiochemical and instrumental NAA, was described to study the distribution pattern and chemical species of iridium in various fractions (soluble carbonate, metal, sulfide, oxide, silicate and acid-insoluble residue) of geological boundary samples, meteorites, ultrabasic rock and volcanic lava. The correlations of Ir with Au, Os, siderophile, chalcophile and lithophile elements were discussed. In addition, the role of kerogen and noble-nugget in the Ir enrichment was scrutinized. The MAA results of Ir favors a mixed effect of asteroid impact, volcanic eruption and post-depositional redistribution to interpret the extant Ir anomaly at Cretaceous-Tertiary boundary layer.


Sulfide Boundary Layer Kerogen Iridium Volcanic Eruption 
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Copyright information

© Akadémiai Kiadó 1995

Authors and Affiliations

  • C. F. Chai
    • 1
  • P. Kong
    • 1
  • X. Y. Mao
    • 1
  • S. L. Ma
    • 1
  1. 1.Institute of High Energy Physics and Laboratory of Nuclear Analysis TechniquesAcademia SinicaBeijing(China)

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