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- W94940981 abstract "Column experiments were performed at 25[sup 0]C for 2,000 hours to simulate chemical reactions occurring in felsic and mafic aquifers. Batch experiments were performed in which each mineral was reacted at room temperature with 1 liter of distilled water for 5,000 hours to account for mineral contributions to the leachate chemistry. At the initial stage (< 1 hour) of the granite column experiment, leachate chemistry is dominated by Na[sup +] and HCO[sub 3][sup [minus]], but at later stages Ca[sup +2] becomes the dominant cation. The Na-Ca ratio is initially above 5 at 0.5 hours, then decreases rapidly to less than 1 and stabilizes at 0.3 after 100 hours. The Ca-Mg ratio increases with time from 2.7 to 11.1, but does not stabilize. Because oligoclase is the sole source of Na[sup +] and Ca[sup +2] from the granite, these data indicate that the alternation of oligoclase to a Na-aluminosilicate is probably the dominant weathering reaction. The norite leachate chemistry is dominated by Ca[sup +2] and HCO[sub 3][sup [minus]] throughout the 2,000 hour reaction period. The Na-Ca ratio decreases from 0.7 to 0.1 while the Ca-Mg ratio increases from 2.1 to 4.0 over the first 50 hours. Na[sup +] and Ca[sup +2]more » are contributed by bytownite and augite, and Mg[sup +2] is contributed by bronzite and augite. The leachate chemistry appears to be dominated by the dissolution of plagioclase during the initial stage of the experiment, and by the dissolution of pyroxene during the latter. The constant Na-Ca and Ca-Mg ratios after 100 hours indicate that steady-state between the aluminosilicates and the leachate chemistry is attained at this time.« less" @default.
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- W94940981 date "1992-01-01" @default.
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- W94940981 title "Low temperature chemical reactions in granitic and mafic aquifers: A laboratory study" @default.
- W94940981 hasPublicationYear "1992" @default.
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