Geochemical Model of the Granite-Bentonite-Groundwater at Äspö (LOT Experiment)

C. Domènech, D. Arcos, J. Bruno, O. Karnland, Arto Muurinen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


A geochemical modelling of one of the experimental parcels of the LOT experiment (Äspö, Sweden) is presented. The model consists on a 2D reactive transport model of a perpendicular section of the experimental borehole with a stationary temperature gradient ranging from 130 to 15°C. The results of the model show that temperature has an important effect on the geochemical evolution of the system. Due to the temperature effect, anhydrite replaces gypsum and hematite precipitates instead of Fe(OH)3(am). Calcite and siderite dissolve in the warmer part of bentonite; whereas a major replacement of Na by Ca in the bentonite takes place close to the bentonite-granite boundary. pH is buffered by the equilibrium with calcite, although the effect of temperature leads to a decrease in pH.
Original languageEnglish
Title of host publicationScientific Basis for Nuclear Waste Management XXVII
PublisherMaterials Research Society
ISBN (Print)978-1-55899-752-3, 1-55899-752-0
Publication statusPublished - 2004
MoE publication typeA4 Article in a conference publication
Event27th MRS Symposium on the Scientific Basis for Nuclear Waste Management - Kalmar, Sweden
Duration: 15 Jun 200319 Jun 2003

Publication series

SeriesMRS Online Proceedings


Conference27th MRS Symposium on the Scientific Basis for Nuclear Waste Management


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