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


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.


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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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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