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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Predicting shear viscosity during volcanic processes at the glass transition: a calorimetric calibration
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Predicting shear viscosity during volcanic processes at the glass transition: a calorimetric calibration

机译：在玻璃化转变的火山过程中预测剪切粘度：量热校准

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摘要

The viscosity of volcanic melts at the glass transition has been determined for 11 compositions ranging from basanite to rhyolite. Determination of the temperature dependence of viscosity, together with the cooling rate dependence of the glass transition, permits the calibration of the value of the viscosity an the glass transition at a given cooling rate for each melt. Temperature-dependent viscosities have been obtained using micropenetration methods in the range 10~8-10~(12) Pa s. Glass transition temperatures have been obtained using differential scanning calorimetry. For each investigated melt composition, the activation energies yielded by calorimetry and viscometry are identical. This confirms that a simple shift factor can be used for each in order to determine the viscosity at the glass transition for a given cooling rate in nature. The results of this study indicate that there is a subtle but significant compositional dependence of the shift factor of a factor of 10 (in log terms) from 10.8 to 9.8. The composition dependence of the shift factor is cast here in terms of a compositional parameter, the mol% of excess oxides (defined within). Using such a parameterisation we obtain a non-linear dependence of the shift factor upon composition that matches the 17 observed values within error. The resulting model permits the prediction of viscosity at the glass transition, during the cooling of glassy volcanic rocks to within 0.1 log units.
机译：已经确定了从玄武岩到流纹岩的11种成分在玻璃化转变时火山熔体的粘度。粘度对温度的依赖性以及玻璃化转变对冷却速率的依赖性的确定允许对每种熔体在给定的冷却速率下对玻璃化转变的粘度值进行校准。使用微渗透法获得的温度依赖性粘度范围为10〜8-10〜（12）Pa s。使用差示扫描量热法已经获得了玻璃化转变温度。对于每种研究的熔体组成，通过量热法和粘度法得出的活化能是相同的。这证实了对于每种性质都可以使用简单的位移因子，以便在自然条件下确定给定冷却速率下玻璃化转变时的粘度。这项研究的结果表明，从10.8到9.8，位移因子的微妙但显着的成分依赖性为10（对数）。在此，根据成分参数，即过量氧化物的mol％（在其内定义）来确定移位因子的成分依赖性。使用这种参数化，我们获得了移位因子对成分的非线性依赖性，该成分与误差内的17个观察值相匹配。所得模型可以预测玻璃化火山岩冷却至0.1 log单位以内时玻璃化转变时的粘度。

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