Multi-scale study of the mineral porosity of veined gneiss and pegmatitic granite from Olkiluoto,Western Finland |
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| Authors: | Juuso Sammaljärvi Antero Lindberg Mikko Voutilainen Jussi Ikonen Marja Siitari-Kauppi Petteri Pitkänen Lasse Koskinen |
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| Institution: | 1.Radiochemistry Unit, Department of Chemistry,University of Helsinki,Helsinki,Finland;2.Geological Survey of Finland,Espoo,Finland;3.Posiva Oy Olkiluoto,Eurajoki,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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