Effects of Fine‐Scale Surface Alterations on Tracer Retention in a Fractured Crystalline Rock From the Grimsel Test Site

Fine‐scale alterations found on fracture surfaces and between fracture surfaces and rock matrix are key uncertainties that need to be considered when developing solute transport models for fractured crystalline rocks. This paper presents a comprehensive approach developed for coupling laboratory tes...

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Bibliographic Details
Published in:Water resources research 2018-11, Vol.54 (11), p.9287-9305
Main Authors: Tachi, Yukio, Ito, Tsuyoshi, Akagi, Yosuke, Satoh, Hisao, Martin, Andrew J.
Format: Article
Language:English
Subjects:
Anions
Cations
Computed tomography
Coupling
Crystal structure
Crystalline rocks
Crystallinity
Deuteration
Diffusion
Diffusion effects
Diffusion layers
Diffusion parameters
Diffusion tests
Dye dispersion
Electron probe
Electron probe microanalysis
Electron probes
Fracture surfaces
fractured crystalline rock
Fractures
Grimsel Test Site
Laboratories
Laboratory tests
matrix diffusion
Mica
Modelling
Porosity
Properties
radionuclide migration
Retention
Rock
Rocks
Solute transport
Solutes
Sorption
surface alteration
Tests
Tomography
Tracer transport
Tracers
Transport
Transport processes
Vermiculite
Vermiculites
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Summary:Fine‐scale alterations found on fracture surfaces and between fracture surfaces and rock matrix are key uncertainties that need to be considered when developing solute transport models for fractured crystalline rocks. This paper presents a comprehensive approach developed for coupling laboratory tests, microscopic observations, and modeling in order to understand and quantify tracer transport processes occurring in natural fracture surfaces, using a single‐fractured granodiorite sample from the Grimsel Test Site, Switzerland. Laboratory tests including through‐diffusion, batch sorption, and flow‐through tests using five tracers with different retention properties indicated that tracer retention was consistently in the sequence of HDO or HTO (deuterated or tritiated water) ≈ Se 
ISSN:0043-1397
1944-7973
DOI:10.1029/2018WR023145