| Autor: |
Azaroual, Mohamed, Fouillac, Christian |
| Zdroj: |
Applied Geochemistry; 1997, Vol. 12 Issue: 1 p55-73, 19p |
| Abstrakt: |
Distilled water was percolated for 38 days through Soultz granite (France) from the candidate site of the future Hot Dry Rock (HDR) geothermal exchanger at 180°C and 14 bars in a dynamic experimental system (plug-flow system with Ti reaction cell: I.D. 50 mm and L. 120 mm). The amplitude of dissolution and precipitation reactions was estimated after fluid analysis, and scanning electron microscope observations of the minerals were done following the percolation experiment. There were well developed etch pits on the surface of the feldspars. These were, therefore, the most reactive minerals. Dissolution and precipitation are distributed in zones along the flow path of the reacting fluid. Newly precipitated calcite is observed along the fluid flow path. Ferromagnesian saponite precipitates only at the outlet part of the system. The following mobility order was observed: SiO2 > HCO3 > F ∼ Na > Ca > Al > Li > Cs > Mg > Ba > Rb > B > Sr. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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