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JDR Vol.14 No.4 pp. 616-622
(2019)
doi: 10.20965/jdr.2019.p0616

Paper:

A Simple Procedure for Measuring Magma Rheology

Aika K. Kurokawa*,†, Takahiro Miwa*, and Hidemi Ishibashi**

*National Research Institute for Earth Science and Disaster Resilience (NIED)
3-1 Tennodai, Tsukuba, Ibaraki 305-0006, Japan

Corresponding author

**Department of Geosciences, Faculty of Science, Shizuoka University, Shizuoka, Japan

Received:
November 1, 2018
Accepted:
February 16, 2019
Published:
June 1, 2019
Keywords:
magma, rheology, non-Newtonian, microstructure, Izu–Oshima
Abstract

In this study, a procedure to measure the viscosity of multi-phase magma at high temperatures (>1000°C) was developed by using a simple apparatus comprising a commercially available desktop furnace and viscometer. In particular, the use of a disposable container enabled observations of the microstructure of an entire sample. The procedure was applied to basaltic andesite magma of the 1986 Izu–Oshima fissure eruption, Japan. The results show that reliable data, consistent with previous studies, were obtained and that the magma rheology became non-Newtonian with decreasing temperature, showing clear shear-thinning behavior. The rheological properties of the magma at 1180°C are quantitatively described as a function of shear rate based on three simple non-Newtonian fluid models. Sectional views of the sample confirm that plagioclase and Fe–Ti oxide crystals were nearly uniformly dispersed in the sample. The mean crystal volume fraction of 0.14 enabled crystal interactions inducing changes in crystal arrangement, affecting the rheology.

Cite this article as:
A. Kurokawa, T. Miwa, and H. Ishibashi, “A Simple Procedure for Measuring Magma Rheology,” J. Disaster Res., Vol.14, No.4, pp. 616-622, 2019.
Data files:
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Last updated on Jul. 12, 2019