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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Non-newtonian Behavior Of Plagioclase-bearing Basaltic Magma: Subliquidus Viscosity Measurement Of The 1707 Basalt Of Fuji Volcano, Japan
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Non-newtonian Behavior Of Plagioclase-bearing Basaltic Magma: Subliquidus Viscosity Measurement Of The 1707 Basalt Of Fuji Volcano, Japan

机译：斜长岩玄武岩浆的非牛顿行为：日本富士火山1707玄武岩的亚液相线粘度测量

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Laboratory measurements of viscosity were done for basalt erupted in 1707 AD from Fuji volcano, Japan, using a concentric cylinder rotational viscometer at temperatures of 1297-1157 ℃, 1 atm pressure, and fO_2 near the Ni-NiO buffer. On cooling, elongated plagioclase crystals with a mean length/width ratio of ca. 8.5 appeared at 1237 ℃, followed by olivine at 1157 ℃. At progressively lower temperatures, the total crystal volume fraction increased monotonously to ca. 0.25; viscosity increased from 38.9 to 765 Pa s at a shear strain rate of 1 s~(-1). This basalt magma behaves as a Newtonian fluid at temperatures greater than 1217 ℃, but shear-thinning behavior occurs at temperatures less than 1197 ℃ because of the suspended plagioclase crystals. This behavior is well approximated as a power law fluid. At the onset of shear thinning, the crystal volume fraction was between 0.06 and 0.13, which is attributed to the pronounced lath-shape of plagioclase crystals. The relative viscosity increases monotonously with increase of crystal volume fraction at a constant shear strain rate, and with decrease of shear strain rate at a constant crystal volume fraction. A modified form of the Krieger-Dougherty equation is introduced herein. It enables us to describe the dependencies of relative viscosity on both the crystal volume fraction and shear strain rate, and consequently the onset of shear-thinning behavior.
机译：使用同心圆筒旋转粘度计在1297-1157℃，1 atm的压力和fO_2在Ni-NiO缓冲液附近，对日本富士火山在1707年喷出的玄武岩进行了粘度实验室测试。在冷却时，平均长度/宽度比为约1的拉长的斜长石晶体。在1237℃下出现8.5，随后在1157℃下出现橄榄石。在逐渐降低的温度下，总晶体体积分数单调增加至约。 0.25；在1 s〜（-1）的剪切应变速率下，粘度从38.9增加到765 Pa s。该玄武岩岩浆在高于1217℃的温度下表现为牛顿流体，但由于悬浮的斜长石晶体，在低于1197℃的温度下会发生剪切稀化行为。这种行为可以很好地近似为幂律流体。在剪切稀化开始时，晶体体积分数在0.06至0.13之间，这归因于斜长石晶体的明显板条形。在恒定剪切应变速率下，相对粘度随晶体体积分数的增加而单调增加，而在恒定晶体体积分数下，相对粘度随剪切应变率的降低而单调增加。本文介绍了Krieger-Dougherty方程的修改形式。它使我们能够描述相对粘度对晶体体积分数和剪切应变率的依赖性，并因此描述剪切稀化行为的开始。

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