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Hyperfine Interactions

, Volume 141, Issue 1–4, pp 357–360 | Cite as

Evidence of Impact at the Permian/Triassic Boundary from Mössbauer Spectroscopy

  • H. C. Verma
  • C. Upadhyay
  • R. P. Tripathi
  • A. D. Shukla
  • N. Bhandari
Article

Abstract

Sediment samples from Spiti valley, India, deposited about 250 Million years ago during the Permian-Triassic transition, have been analysed. 57Fe Mössbauer spectroscopic studies show that iron occurs mainly as nanoparticles of hematite and goethite with a broad size distribution. The results show a high degree of resemblance with the Cretaceous-Tertiary boundary (65 My) samples where an asteroidal impact is believed to have caused mass extinction.

Keywords

Hematite Goethite Mass Extinction Boundary Sample Asteroidal Impact 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Alvarez, L. W., Alvarez, W., Asaro, F. and Michel, H. V., Science 208 (1980), 1095.ADSGoogle Scholar
  2. 2.
    Bohor, B. F., Foord, E. E., Modreski, P. J. and Triplehorn, D. M., Science 224 (1984), 867.ADSGoogle Scholar
  3. 3.
    Robin, E., Bonte, P. H., Forget, L., Jehanno, C. and Rocchia, R., Earth Planet. Sci. Lett. 108 (1992), 181.CrossRefADSGoogle Scholar
  4. 4.
    Bhandari, N., Verma, H. C., Upadhyay, C., Tripathi, A. and Tripathi, R. P., Geol. Soc. Am. Spl. Pap. 356 (2002), 201.Google Scholar
  5. 5.
    Wdowiak, T. J., Armendarez, L. P., Agresti, D. G., Wade, M. L., Wdowiak, S. Y., Claey, P. and Izett, G., Meteoritics and Planetar Science 36 (2001), 123.ADSCrossRefGoogle Scholar
  6. 6.
    Verma, H. C., Upadhyay, C., Tripathi, A., Tripathi, R. P. and Bhandari, N., Meteoritics and Planetary Science 37 (2002), 901.ADSGoogle Scholar
  7. 7.
    Hongfu, Y. and Jinnan, T., Palaeo 143 (1998), 199.Google Scholar
  8. 8.
    Retallack, G. J., Seyedolali, A., Krull, E. S., Holser, W. T., Ambers, C. P. and Kyte, F. T., Geology 26 (1998), 979.CrossRefADSGoogle Scholar
  9. 9.
    Becker, L., Poreda, R. J., Hunt, A. G., Bunch, T. E. and Rampino, M., Science 291 (2001), 1530.CrossRefADSGoogle Scholar
  10. 10.
    Bhandari, N., Shukla, P. N. and Azmi, R. J., Geol. Res. Lett. 19 (1992), 1531.ADSGoogle Scholar
  11. 11.
    Shukla, A. D., Bhandari, N. and Shukla, P. N., Geol. Soc. Am. Spl. Pap. 356 (2002), 445P.Google Scholar
  12. 12.
    Mørup, S., J. Magn. Magn. Mater. 37 (1983), 39.CrossRefADSGoogle Scholar

Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • H. C. Verma
    • 1
  • C. Upadhyay
    • 1
  • R. P. Tripathi
    • 2
  • A. D. Shukla
    • 3
  • N. Bhandari
    • 3
  1. 1.Department of PhysicsIndian Institute of TechnologyKanpurIndia
  2. 2.Department of PhysicsJai Narain Vyas UniversityJodhpurIndia
  3. 3.Physical Research Laboratory, NavrangpuraAhmedabadIndia

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