ICAME 2007 pp 897-904 | Cite as

Mössbauer studies on impactites from Lonar impact crater

  • H. C. Verma
  • S. Misra
  • M. Shyam Prasad
  • N. Bijlani
  • A. Tripathi
  • Horton Newsom
Conference paper

Abstract

Iron mineralogy has been studied using Mössbauer spectroscopy on eight glassy impactite samples from different parts of the Lonar Crater Rim Region. Distinct changes are observed when compared to the host basaltic samples. Significant amount of Fe3 +  phase is observed in the impactite samples whereas this phase is known to be almost absent in the basalt. Besides this we have a strong Fe2 +  doublet showing up corresponding to the main iron-containing mineral. The Mössbauer results are very similar to those with glasses from Ries crater which is also believed to have formed by meteoritic impact but on nonbasaltic rock bed. Besides the glassy samples, we also study some spherules found in the crater region and some fine glassy particles on the surfaces of melt impact bombs. These contain a good amount of magnetically ordered phase, most likely nanosize hematite. Interestingly, part of it is strongly attracted by a magnet and part of it is not. But both parts show a significantly strong six-line component corresponding to hematite.

Keywords

Mössbauer studies Impactites Lonar impact crater 

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Copyright information

© Springer Science + Business Media B.V. 2008

Authors and Affiliations

  • H. C. Verma
    • 1
  • S. Misra
    • 2
    • 6
  • M. Shyam Prasad
    • 3
  • N. Bijlani
    • 4
  • A. Tripathi
    • 4
  • Horton Newsom
    • 5
  1. 1.Department of PhysicsI I T KanpurKanpurIndia
  2. 2.Department of Geology and GeophysicsI I T, KhragpurKharagpurIndia
  3. 3.Geological Oceanography DivisionNational Institute of OceanographyDona PaulaIndia
  4. 4.Department of PhysicsJ.N.V. UniversityJodhpurIndia
  5. 5.Institute of Meteoritics and Department of Earth and Planetary SciencesUniversity of New MexicoAlbuquerqueUSA
  6. 6.Indian Institute of GeomagnetismNavi MumbaiIndia

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