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Preliminary microfocus X-ray computed tomography survey of echinoid fossil microstructure

By
S. R. Stock
S. R. Stock
Institute for Bioengineering and Nanoscience in Advanced Medicine, Northwestern University, Chicago, IL 60611-3008, USA (e-mail: s-stock@northwestern.edu)
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A. Veis
A. Veis
Department of Cell and Molecular Biology, Northwestern University Medical School, Chicago, IL 60611, USA
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Published:
January 01, 2003

Abstract

Microfocus X-ray computed tomography (μCT), a high resolution variant of medical CT, was used to non-invasively examine Jurassic echinoid fossils with spine, demipyramid and test plate fragments serving to assess the extent to which the microstructure remained unaffected by diagenesis. The sizes of the calcite-crystal stereom remains dictated the resolution that could be obtained. The smaller diameter spines were imaged with 9× 9 × c. 25 μm voxels; the larger demipyramids and test plate fragments were imaged with 13 × 13 μm and 17 × 17μm voxels, respectively, in the plane of reconstruction and with a proportionally larger slice thickness. The stereom structure was not seen in the μCT slices of the fossils. This is not surprising because, for the ossicles studied, the stereom pore dimensions are, for the most part, smaller than the resolution of the μCT system. Tide marks and other low absorption features were found in the spines and appear to be related to diagenetic changes. What appear to be cleavage cracks were observed in the demipyramid and some of the pores for tube feet could be seen in the test fragment.

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Geological Society, London, Special Publications

Applications of X-ray Computed Tomography in the Geosciences

F. Mees
F. Mees
Ghent University, Belgium
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R. Swennen
R. Swennen
Physico-chemical Geology, K. U. Leuven, Belgium
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M. Van Geet
M. Van Geet
SCK-CEN, Belgium
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P. Jacobs
P. Jacobs
Ghent University, Belgium
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Geological Society of London
Volume
215
ISBN electronic:
9781862394636
Publication date:
January 01, 2003

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