Abstract
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 language | English |
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Title of host publication | Scientific Basis for Nuclear Waste Management XXVII |
Publisher | Materials Research Society |
Pages | 855-860 |
ISBN (Print) | 978-1-55899-752-3, 1-55899-752-0 |
DOIs | |
Publication status | Published - 2004 |
MoE publication type | A4 Article in a conference publication |
Event | 27th MRS Symposium on the Scientific Basis for Nuclear Waste Management - Kalmar, Sweden Duration: 15 Jun 2003 → 19 Jun 2003 |
Publication series
Series | MRS Online Proceedings |
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Volume | 807 |
ISSN | 1946-4274 |
Conference
Conference | 27th MRS Symposium on the Scientific Basis for Nuclear Waste Management |
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Country/Territory | Sweden |
City | Kalmar |
Period | 15/06/03 → 19/06/03 |