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

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http://hdl.handle.net/10138/272984

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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

Titel: Porosity distribution in a heterogeneous clay-rich fault core by image processing of 14C-PMMA autoradiographs and Scanning Electron Microscopy
Författare: Nenonen, Ville Valtteri; Sammaljärvi, Juuso; Johanson, Bo; Voutilainen, Mikko; L'Hôpital, Emilie; Dick, Pierre; Siitari-Kauppi, Marja
Upphovmannens organisation: Department
Department of Chemistry
Geological disposal of spent nuclear fuel
Datum: 2018
Språk: eng
Sidantal: 7
Tillhör serie: MRS Advances
ISSN: 2059-8521
DOI: https://doi.org/10.1557/adv.2017.615
Permanenta länken (URI): http://hdl.handle.net/10138/272984
Abstrakt: 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.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
Referentgranskad: Ja
Licens: cc_by
Användningsbegränsning: openAccess
Parallelpublicerad version: publishedVersion


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