Porosity distribution in a heterogeneous clay-rich fault core by image processing of 14C-PMMA autoradiographs and Scanning Electron Microscopy

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Nenonen , V V , Sammaljärvi , J , Johanson , B , Voutilainen , M , L'Hôpital , E , Dick , P & Siitari-Kauppi , M 2018 , ' Porosity distribution in a heterogeneous clay-rich fault core by image processing of 14C-PMMA autoradiographs and Scanning Electron Microscopy ' , MRS Advances , vol. 3 , no. 21 , pp. 1167-1173 . https://doi.org/10.1557/adv.2017.615

Title: Porosity distribution in a heterogeneous clay-rich fault core by image processing of 14C-PMMA autoradiographs and Scanning Electron Microscopy
Author: Nenonen, Ville Valtteri; Sammaljärvi, Juuso; Johanson, Bo; Voutilainen, Mikko; L'Hôpital, Emilie; Dick, Pierre; Siitari-Kauppi, Marja
Contributor: University of Helsinki, Department
University of Helsinki, Department of Chemistry
University of Helsinki, Geological disposal of spent nuclear fuel
University of Helsinki, Department of Chemistry
Date: 2018
Language: eng
Number of pages: 7
Belongs to series: MRS Advances
ISSN: 2059-8521
URI: http://hdl.handle.net/10138/272984
Abstract: Shale formations are considered by a number of countries as the most suitable media to dispose of high-level radioactive waste. This is mainly due to the impermeable, self-sealing, chemical reducing, and sorption properties that tend to retard radionuclide migration. However, shale formations can also contain highly connected fault zones with permeabilities that can differ of several orders of magnitudes with respect to the undeformed host rock. The objective of this work is to use the 14C-PMMA autoradiography method combined with SEM-EDS measurements to understand the porosity variations in and around fault gouges and to define their relationship to mechano-chemical processes. The studied samples were taken from a low permeability shale in a small-scale vertical strike-slip fault at the Tournemire underground research laboratory. Results display significant variations in porosity and mineralogy along the studied gouge zone due to polyphased tectonics and paleo-fluid circulations.
Subject: 116 Chemical sciences
1171 Geosciences
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