論文

査読有り
2019年6月1日

A Simple Procedure for Measuring Magma Rheology

Journal of Disaster Research
  • Aika K. Kurokawa
  • ,
  • Takahiro Miwa
  • ,
  • Hidemi Ishibashi

14
4
開始ページ
616
終了ページ
622
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.20965/jdr.2019.p0616
出版者・発行元
Fuji Technology Press Ltd.

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.

リンク情報
DOI
https://doi.org/10.20965/jdr.2019.p0616
URL
https://www.fujipress.jp/main/wp-content/themes/Fujipress/phyosetsu.php?ppno=DSSTR001400040005

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