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Multi-scale study of the mineral porosity of veined gneiss and pegmatitic granite from Olkiluoto, Western Finland

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Abstract

The purpose of this work was to support the long-term experiments for investigation of rock matrix retention properties at the spent nuclear fuel repository site ONKALO, in Olkiluoto, Western Finland. Towards this end, rock samples were characterised in terms of porosity connected to mineralogy, with emphasis on pore sizes, and fillings. Both filled and unfilled pores were found with unfilled pores being majority in the pegmatitic granite veins of the mostly veined gneiss samples. It was found that the fillings were often connected to local alteration and the alteration caused variation in the range of pore sizes.

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Acknowledgements

The authors wish to thank Bo Johansson and Sari Lukkari from the Geological Survey of Finland for their help with the FESEM imaging.

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Authors and Affiliations

  1. Radiochemistry Unit, Department of Chemistry, University of Helsinki, P.O. Box 55, 00014, Helsinki, Finland

    Juuso Sammaljärvi, Mikko Voutilainen, Jussi Ikonen & Marja Siitari-Kauppi

  2. Geological Survey of Finland, Betonimiehenkuja 4, 02151, Espoo, Finland

    Antero Lindberg

  3. Posiva Oy Olkiluoto, 27160, Eurajoki, Finland

    Petteri Pitkänen & Lasse Koskinen

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  1. Juuso Sammaljärvi
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Correspondence to Juuso Sammaljärvi.

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Sammaljärvi, J., Lindberg, A., Voutilainen, M. et al. Multi-scale study of the mineral porosity of veined gneiss and pegmatitic granite from Olkiluoto, Western Finland. J Radioanal Nucl Chem 314, 1557–1575 (2017). https://doi.org/10.1007/s10967-017-5530-5

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