Investigation of a Monturaqui Impactite by Means of Bi-Modal X-ray and Neutron Tomography

Anna Fedrigo*, Kasper Marstal, Christian Bender Koch, Vedrana Andersen Dahl, Anders Bjorholm Dahl, Mark Lyksborg, Carsten Gundlach, Frédéric Ott, Markus Strobl

*Corresponding author for this work

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X-ray and neutron tomography are applied as a bi-modal approach for the 3D characterisation of a Monturaqui impactite formed by shock metamorphism during the impact of an iron meteorite with the target rocks in the Monturaqui crater (Chile). The particular impactite exhibits structural heterogeneities on many length scales: its composition is dominated by silicate-based glassy and crystalline materials with voids and Fe/Ni-metal and oxihydroxides particles generally smaller than 1 mm in diameter. The non-destructive investigation allowed us to apply a novel bi-modal imaging approach that provides a more detailed and quantitative understanding of the structural and chemical composition compared to standard single mode imaging methods, as X-ray and neutron interaction with matter results in different attenuation coefficients with a non-linear relation. The X-ray and neutron data sets have been registered, and used for material segmentation, porosity and metallic content characterization. The bimodal data enabled the segmentation of a large number of different materials, their morphology as well as distribution in the specimen including the quantification of volume fractions. The 3D data revealed an evaporite type of material in the impactite not noticed in previous studies. The present study is exemplary in demonstrating the potential for non-destructive characterisation of key features of complex multi-phase objects such as impactites.
Original languageEnglish
Article number72
JournalJournal of Electronic Imaging
Issue number5
Number of pages24
Publication statusPublished - 2018

Bibliographical note

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).


  • Neutron imaging
  • X-ray imaging
  • Multimodal imaging
  • Bimodal imaging
  • Computed tomography
  • Impactite
  • Monturaqui

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