Viscosity of Evolving Magmas: A case study of the Glass House Mountains, Australia

这些被称为玻璃屋山脉(GHM)的火山展示了一系列岩浆的成分，这些岩浆是由一个岩浆室的分离结晶产生的，该岩浆室与2600万年前澳大利亚大陆越过地幔热柱有关。关于这些岩浆的侵位或岩浆室的温度的信息很少。作为解决玻璃之家山脉火山塞的产状和岩浆室中发生的过程的第一个方法，将确定不同岩浆成分的粘度。该组分系列为测定经历分离结晶和释放的岩浆室的粘度提供了一个教科书案例。玻璃之家山脉岩浆的流变性将使用微渗透技术在高粘度条件下进行测定。使用热容数据以及粘度与构型熵和温度之间的Adam-Gibbs关系，可以将粘度外推到低粘度条件。

The volcanoes known as the Glass House Mountains (GHM) illustrate a compositional series of magmas produced by fractional crystallisation of a magma chamber which is associated with the Australian continent passing over a mantle plume 26 million years ago. There is little information on the emplacement of these magmas or the temperature of the magma chamber. As a first approach to addressing the occurrence of the Glass House Mountains volcanic plugs and the processes occurring in the magma chamber, the viscosity of the different magma compositions will be determined. The compositional series provide a textbook case for the determination of viscosity of a magma chamber undergoing fractional crystallisation and discharge. The rheology of the Glass House Mountains magmas will be determined at high viscosity conditions using the micro-penetration technique. The viscosities will be extrapolated to low viscosity conditions using heat capacity data and the Adam-Gibbs relationship between viscosity and configurational entropy and temperature.