Investigations on the effects of flow on texture development of magmas

对高温条件下的岩浆进行了结晶和粘度测量实验，定量考察了悬浮晶体对岩浆粘度的影响。在此基础上，建立了伊豆大岛火山和樱岛火山熔岩黏度随温度和晶体体积分数的函数方程，并阐明了板状斜长石晶体对岩浆流变行为的影响。这些结果使我们注意到使用现有的富晶岩浆粘度方程的问题，以及岩浆结构通过结晶的时间序列发展的重要性。

Crystallization and viscosity measurement experiments were performed for magmas at high temperature conditions to quantitatively examine the effects of suspended crystals on viscosities of magmas. Based on the experiments, the equations to describe viscosities of lavas from the Izu-Oshima and the Sakurajima volcanoes were established as functions of temperature and crystal volume fraction, and also the effects of tabular plagioclase crystals on rheological behaviors of magmas were clarified. These results made us to note the problem of using the existing viscosity equation for crystal-rich magma and the importance of time-series development of magma texture through crystallization.