Hostname: page-component-848d4c4894-8kt4b Total loading time: 0 Render date: 2024-06-22T17:51:23.831Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Published online by Cambridge University Press:  01 February 2011

C. Domènech ,
D. Arcos ,
J. Bruno ,
O. Karnland  and
A. Muurinen
C. Domènech
Affiliation:
ENVIROS SPAIN, P. de Rubí, 29–31, Valldoreix. 08197 Spain (darcos@enviros.biz)
D. Arcos
Affiliation:
ENVIROS SPAIN, P. de Rubí, 29–31, Valldoreix. 08197 Spain (darcos@enviros.biz)
J. Bruno
Affiliation:
ENVIROS SPAIN, P. de Rubí, 29–31, Valldoreix. 08197 Spain (darcos@enviros.biz)
O. Karnland
Affiliation:
Clay Technology AB, IDEON Research Center, Lund, Sweden.
A. Muurinen
Affiliation:
VTT, Espoo, Finland.
Get access

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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 807: Symposium Scientific Basis for Nuclear Waste Management XXVII , 2003 , 855
Copyright
Copyright © Materials Research Society 2004

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Karnland, O., Sandén, T., Johannesson, L.E., Eriksen, T.E., Jansson, M., Wold, S., Pedersen, K., Motamedi, M. and Rosborg, B. (2000) SKB Tec. Rep. TR-00–22, 131 pp.Google Scholar
2. Liu, J., Yamada, H., Kozaki, T., Sato, S. and Ohashi, H. (2003) Journal of contaminant hydrology, 61, 85–93.Google Scholar
3. Bruno, J., Arcos, D. and Duro, L. (1999) SKB technical report TR-99–29.Google Scholar
4. Parkhurst, D.L., Kipp, K.L. and Engesgaard, P. (2000) PHAST. A Program for Simulating Ground-Water Flow and Multicomponent Geochemical Reactions. User's guide. USGS, 154 pp.Google Scholar
5. Pedersen, K. and Karlsson, F. (1995) SKB technical report TR 95–10.Google Scholar
6. Barnes, H.L. (ed) (1997) Geochemistry of hydrothermal ore deposits. John Wiley and sons, 3rd ed. USA.Google Scholar