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TitleAccuracy of low porosity measurements in granite
DownloadDownload (whole publication)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorKatsube, T J; Scromeda, N
SourceCanadian Shield/Bouclier canadien; by Geological Survey of Canada; Geological Survey of Canada, Current Research no. 1995-C, 1995 p. 265-270, Open Access logo Open Access
PublisherNatural Resources Canada
Lang.English; French
Mediapaper; on-line; digital
RelatedThis publication is contained in Canadian Shield
File formatpdf
Subjectsigneous and metamorphic petrology; porosity; igneous rocks; granites; plutonic rocks; analytical methods
Released1995 01 01
AbstractEffective porosity (øE) of 32 granite samples from the Canadian Shield has been measured and compared with similar measurements previously made on the same samples, using slightly different measurement procedures. The purpose was to investigate measurement accuracy of previous low porosity measurements. Effective porosity is determined by taking the difference between a water-saturated and oven-dried sample. Results show that øE values (0.27-0.64%) obtained in this study are similar to those (0.16-0.60%) obtained in the past. A comparison of individual values show that previous values are lower by 10-40%. Results also indicate that reduced water saturation time and drying temperatures, used previously, account for up to about 12% of that 40% and that other explanations must be found for the remaining 28%. The currently used saturation time and drying temperature are 300 minutes and 116°C, respectively, in compared to 40 minutes and 100-105°C used in the past.

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