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首页> 外文期刊>The American mineralogist >Crystallization experiments in rhyolitic systems: The effect of temperature cycling and starting material on crystal size distribution
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Crystallization experiments in rhyolitic systems: The effect of temperature cycling and starting material on crystal size distribution

机译：菱形系统中的结晶实验：温度循环和原料对晶体尺寸分布的影响

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摘要

One of the various problems faced in experimental petrology is the fact that most experimental products obtained by crystallization experiments are too small, making their accurate identification by electron microprobe and laser ablation analyses very difficult. This problem is magnified when a highly polymerized starting material is used for experiments at low temperature (e.g., 700-800 degrees C). In this study, we present the results of crystallization experiments performed using a rhyolitic starting glass in which we test the potential of temperature cycling and pre-hydrated starting material to increase crystal size and discuss the effect of those variables on the attainment of chemical equilibrium. Experiments were performed at different temperatures (725 to 815 degrees C) and pressures (1 and 2 kbar), under water-saturated conditions (a(H2O) = 1; with a(H2O) being the water activity). During the experiments, temperature was either constant or cycled to +/- 15 degrees C around the target temperature during the first half of the runs. We used either a pre-hydrated (7 wt% H2O) rhyolitic glass or a dry rhyolitic glass to which 7 wt% H2O was added during capsule preparation.
机译：实验思科中面临的各种问题之一是通过结晶实验获得的大多数实验产物太小，通过电子微探针和激光烧蚀的准确识别非常困难。当高聚合的原料用于低温（例如700-800℃）时，将该问题放大。在该研究中，我们介绍了使用菱形起始玻璃进行的结晶实验结果，其中我们测试了温度循环和预水合原料的电位，以增加晶体尺寸，并讨论这些变量对达到化学平衡的影响。在水饱和条件下在不同温度（725至815℃）（725至815℃）和压力（1和2kbar）下进行实验（a（H2O）= 1;用（H2O）是水活性）。在实验期间，在运行的前半部分期间，温度在目标温度周围恒定或循环至+/- 15摄氏度。我们使用预水合（7wt％H 2 O）卟啉玻璃或干卟啉玻璃，在胶囊制剂期间加入7wt％H 2 O。

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