An expanded model and application of the combined effect of crystal-size distribution and crystal shape on the relative viscosity of magmas
An expanded model and application of the combined effect of crystal-size distribution and crystal shape on the relative viscosity of magmas
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DOI：
10.1016/j.jvolgeores.2018.04.018
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发表时间：
2018-05-15
影响因子：
2.9
通讯作者：
Castro, Jonathan M.
中科院分区：
文献类型：
--
作者：
Klein, Johannes;Mueller, Sebastian P.;Castro, Jonathan M.
这项研究考察了晶体尺寸分布(CSD)和晶体形状对无泡泡岩浆悬浮液流变学的综合影响，并首次实际应用了一个经验模型，以用户友好的结构流变学电子表格计算器的形式直接从天然岩石样品的纹理图像分析中估计晶体含量和CSD对岩浆粘度的相对影响。我们推广和应用了晶体悬浮液的最大填充分数Phi(M)与其流变性和CSD的多分散性伽马之间的已建立的关系。通过用玻璃纤维和硅油中的玻璃片作为岩浆当量的模拟旋转流变学实验，本研究还对Phi(M)与悬浮颗粒的长径比r(P)之间的关系提供了新的见解。(C)2018爱思唯尔B.V.保留所有权利。
This study examines the combined effect of crystal-size distributions (CSD) and crystal shape on the rheology of vesicle free magmatic suspensions and provides the first practical application of an empirical model to estimate the relative effect of crystal content and CSD's on the viscosity of magma directly from textural image analysis of natural rock samples in the form of a user-friendly texture-rheology spreadsheet calculator. We extend and apply established relationships between the maximum packing fraction phi(m) of a crystal bearing suspension and both its rheological properties and the polydispersity gamma of a CSD. By using analogue rotational rheometric experiments with glass fibres and glass flakes in silicone oil acting as magma equivalent, this study also provides new insights in the relationship between phi(m) and the aspect ratio r(p) of suspended particles. (C) 2018 Elsevier B.V. All rights reserved.