Kinetics of hydrothermal crystallization of quartz in Na2CO3 solutions |
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Authors: | V N Rumyantsev |
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Institution: | (1) Institute of Lithosphere of Marginal Seas, Russian Academy of Sciences, Staromonetnyi per. 22, Moscow, 109180, Russia |
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Abstract: | The kinetics of crystallization of the {0001}c, {01 $\bar 1$ 1}r, and {10 $\bar 1$ 1}R faces of quartz in 0.5 M Na2CO3 (M is molarity) aqueous solutions has been studied in the temperature range 200–450°C. It is established that the dependence of the crystal growth rate on temperature in the logV-1/T, K coordinates is of a parabolic nature. It is most probable that the nonlinearity of this dependence is associated with a deficiency in the solution of silica monomers, taking part in the elementary event of quartz crystallization. The causes of a jumpwise decrease in the activation energy of the growth of the c, r, and R faces at t > 280–325°C are considered. |
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