Grain Growth Kinetics of Quartz and Calcite Aggregates
Grain Growth Kinetics of Quartz and Calcite Aggregates
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石英和方解石骨料的晶粒生长动力学
DOI：
10.1086/628681
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发表时间：
1982
期刊：
影响因子：
--
通讯作者：
R. Yund
中科院分区：
文献类型：
--
作者：
J. Tullis;R. Yund
在1000° ~ 800°C和15 ~ 2千巴水压下，测定了新星石、燧石和碧玉的晶粒生长速率。预处理建立了平衡的微观结构和几乎均匀的平均晶粒直径（$$\bar{D}_{0}$$）。在1000°C和15 kb下，晶粒生长数据在log（$$\bar {D}-\bar{D}_{0}$$）与log时间曲线上呈线性，尽管碧玉含有5-10体积%的铁氧化物，但三个样品之间没有显着差异。在较低的压力和温度下，生长曲线近似平行于1000°C和15 kb的数据，但生长较慢，并且碧玉的生长比其他两种慢。生长速率强烈依赖于晶间流体中石英的溶解度，活化能约为11千卡/摩尔。这些数据被用来估计石英在变质条件下的生长速率，并帮助评估动态再结晶晶粒的生长可能是显着的条件。方解石颗粒（Solnhofen石灰岩）的生长速度比石英快，但是，它比松散的方解石颗粒慢得多。
Grain growth rates for novaculite, flint and jasper have been determined between 1000° and 800°C and 15 to 2 kb water pressure. A pre-treatment established an equilibrium microstructure and a nearly uniform mean grain diameter ($$\bar{D}_{0}$$). At 1000°C and 15 kb the grain growth data are linear on a log ($$\bar{D}-\bar{D}_{0}$$) vs. log time plot, and there is no significant difference between the three samples although the jasper contained 5-10 vol % iron oxide. At lower pressures and temperatures the growth curves are approximately parallel to the 1000°C and 15 kb data, but growth is slower and that for jasper is slower than for the other two. The growth rate is strongly dependent on the solubility of quartz in the intergranular fluid, and the activation energy is about 11 kcal/mole. The data are used to estimate the growth rate of quartz at metamorphic conditions and to help evaluate the conditions where growth of dynamically recrystallized grains may be significant. The growth rate of calcite grains (Solnhofen limestone) is faster than that for quartz; however, it is considerably slower than that for loose calcite grains.