Analytical and Bioanalytical Chemistry

, Volume 397, Issue 7, pp 2647–2658 | Cite as

Rapid Raman mapping of a fulgurite

  • Elizabeth A. Carter
  • Matthew A. Pasek
  • Tim Smith
  • Terence P. Kee
  • Peter Hines
  • Howell G. M. Edwards
Paper in Forefront

Abstract

A fulgurite is a naturally occurring glass formed when lightning hits sand, rock, or soil. The formation of fulgurites is accompanied by mineralogical and sometimes compositional changes, and may record information about the environment in which they were formed. A previous investigation using Raman point spectroscopy discovered the presence of anatase, a low-temperature polymorph of TiO2, and polyaromatic hydrocarbons within a fulgurite. These findings indicate that there were regions within the sample that were not subjected to temperatures of 2,000 K or more that the matrix is reported to attain when struck by lightning. This paper seeks to expand the previous research by utilizing the capabilities of a new Raman spectroscopic technological development that enables rapid mapping. The entire surface area of a cross-sectioned fulgurite (∼40 mm × 23 mm) sample was mapped allowing several regions of polyaromatic hydrocarbons and anatase to be located. Furthermore, shocked quartz was found within the boundary regions of the fulgurite, and is proposed to have resulted from contact with vaporized material during the lightning strike. Shocked quartz is typically indicative of extraterrestrial impact, yet its discovery here suggests that its formation is not exclusive to the impact process.

Figure

Raman map illustrating the distribution of normal and shocked quartz in a fulgurite

Keywords

Raman spectroscopy Rapid mapping Fulgurite Shocked quartz 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Elizabeth A. Carter
    • 1
  • Matthew A. Pasek
    • 2
  • Tim Smith
    • 3
  • Terence P. Kee
    • 4
  • Peter Hines
    • 5
  • Howell G. M. Edwards
    • 6
  1. 1.Vibrational Spectroscopy Facility, School of ChemistryThe University of SydneySydneyAustralia
  2. 2.Department of GeologyUniversity of South FloridaTampaUSA
  3. 3.Spectroscopy Products DivisionGloucestershireUK
  4. 4.School of ChemistryUniversity of LeedsLeedsUK
  5. 5.Electron Microscope Unit, Australian Key Centre for Microscopy and Microanalysis, Australian Microscopy & Microanalysis Research Facility (AMMRF)The University of SydneySydneyAustralia
  6. 6.Centre for Astrobiology and Extremophiles Research, School of Life SciencesUniversity of BradfordBradfordUK

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