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Pore and mineral structure of rock using nano-tomographic imaging

Published online by Cambridge University Press:  08 April 2015

Jukka Kuva ,
Mikko Voutilainen ,
Antero Lindberg ,
Joni Parkkonen ,
Marja Siitari-Kauppi  and
Jussi Timonen
Jukka Kuva
Affiliation:
University of Jyväskylä, Department of Physics, P.O. Box 35, 40014 University of Jyväskylä, Finland
Mikko Voutilainen
Affiliation:
University of Helsinki, Department of Chemistry, P.O. Box 55, 00014 University of Helsinki, Finland
Antero Lindberg
Affiliation:
Geological Survey of Finland, Betonimiehenkuja 4, 02151 Espoo, Finland
Joni Parkkonen
Affiliation:
University of Jyväskylä, Department of Physics, P.O. Box 35, 40014 University of Jyväskylä, Finland
Marja Siitari-Kauppi
Affiliation:
University of Helsinki, Department of Chemistry, P.O. Box 55, 00014 University of Helsinki, Finland
Jussi Timonen
Affiliation:
University of Jyväskylä, Department of Physics, P.O. Box 35, 40014 University of Jyväskylä, Finland
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Abstract

In order to better understand the micrometer-scale structure of rock and its transport properties which arise from it, seven monomineral samples from two sites (Olkiluoto and Sievi, Finland) were studied with micro- and nanotomography and scanning electron microscopy. From the veined gneiss of Olkiluoto we studied biotite, potassium feldspar, plagioclase (composition of oligoclase) and cordierite, and from Sievi tonalite biotite and two grains of plagioclase (albite). These minerals were the main minerals of these samples. Samples were carefully separated and selected using heavy liquid separation and stereomicroscopy, their three dimensional structure was imaged using X-ray tomography, and their precise mineral composition was determined using scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM/EDS). The micrometer-scale mineral structure of these samples was observed together with their pores and fissures, and alteration effects were identified whenever applicable. Nanotomography combined with SEM analysis was concluded to be a good tool for analyzing effects of alteration in monomineral samples.

Keywords

x-ray tomographygeologicmicrostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1744: Symposium EE – Scientific Basis for Nuclear Waste Management XXXVIII , 2015 , pp. 235 - 240
Copyright
Copyright © Materials Research Society 2015 

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References

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