Molecular activation analysis for iridium

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

Abstract

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.

Keywords

Sulfide Boundary Layer Kerogen Iridium Volcanic Eruption 

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References

  1. 1.
    D. BEHNE, H. HILMERT, S. SHEID, H. GESNNER, W. ELGER, Biochim. Biophys. Acta, 966(1988)12.PubMedGoogle Scholar
  2. 2.
    S. F. STONE, D. HANCOCK, R. ZEISLER, J. Radioanal. Nucl. Chem., Articles, 112(1987)95.Google Scholar
  3. 3.
    C. K. JAYAWICKREME, A. CHATT, J. Radioanal. Nucl. Chem., Articles, 124(1988)257.Google Scholar
  4. 4.
    M. SIMONOFF, D. SHAPCOTT, S. ALAMEDDINE, M. T. SUTTER-DUB, G. SIMONOFF, Biol. Trace Elem. Res., 32(1992)25.PubMedGoogle Scholar
  5. 5.
    J. T. VAN ELTERN, Analytical aspects of speciation of arsenic in aqueous media, Thesis Ultrecht, 1991.Google Scholar
  6. 6.
    J. X. SUN, W. Q. WANG, Proc. of 3rd National REE Bioinog. Chem., Changchun, Aug. 1993.Google Scholar
  7. 7.
    W. Y. FENG, Q. F. QIAN, C. F. CHAI, in this proceedings, Hawaii, April 1994.Google Scholar
  8. 8.
    L. W. ALVAREZ, W. ALVAREZ, F. ASARO, H. V. MICHEL, Science, 208(1980)1095.Google Scholar
  9. 9.
    L. M. VAN VALEN, NATURE, 311(1984)17.Google Scholar
  10. 10.
    L. M. VAN VALEN, Paleobiology, 10(1984)121.Google Scholar
  11. 11.
    D. E. BROWNLEE, B. A. BATES, M. M. WHEELOCK, Nature, 309(1984)693.Google Scholar
  12. 12.
    H. KUCHA, Mineral Petrogr. Mitt., 28(1981)1.Google Scholar
  13. 13.
    C. B. DISSANAYAKE, K. KRISTOTAKIS, Chem. Geol., 42(1984)61.Google Scholar
  14. 14.
    R. SCHMITZ, P. ANDERSSON, J. DAHL, Geochim. Cosmochim. Acta, 52(1988)229.Google Scholar
  15. 15.
    W. S. WOLBACH, et al., Science, 230(1985)167.Google Scholar
  16. 16.
    P. KONG, C. F. CHAI, Chem. Geol., 82(1990)51.Google Scholar
  17. 17.
    P. KONG, C. F. CHAI, J. Radioanal. Nucl. Chem., Articles, 130(1989)221.Google Scholar
  18. 18.
    P. KONG, C. F. CHAI, J. Radioanal. Nucl. Chem., Articles, 151(1991)201.Google Scholar
  19. 19.
    H. FANG, Z. Y. OUYANG, C. F. CHAI, Meteoritics, 23(1988)268.Google Scholar
  20. 20.
    C. F. CHAI, Isotopenpraxis, 24(1988)257.Google Scholar
  21. 21.
    E. ANDERS, N. GREVESSE, Geochim. Cosmochim. Acta, 53(1989)197.Google Scholar
  22. 22.
    E. S. GLADNEY, E. A. JONES, E. J. NICKELL, Geostandards Newsletter, 14(1990)209.Google Scholar
  23. 23.
    A. V. FISENKO, et al., Abstracts of 52nd Meeting of Meteoritical Society, 1989, 61.Google Scholar
  24. 24.
    C. F. CHAI, Geol. Rev. (in Chinese), 32(1986)16.Google Scholar
  25. 25.
    B. DURANO, J. C. MONIN, Kerogen (ed. B. DURANO), Paris, 1989, 61.Google Scholar

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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