Michihiko Nakamura

TL;DR: In this paper, the authors analyzed magnetite phenocrysts in the successively effused dacite of the ongoing Unzen eruption from 1991 to 1993 to estimate the time scale of magma mixing.

TL;DR: In this article, the authors reproduce melt inclusions in plagioclase in a series of partial dissolution experiments, and the compositional differences from the surrounding matrix melt were evaluated, showing that the molar ratio of Ca/(Ca + Na) and the MgO concentration in the synthesized melt inclusion are up to 17 and 61% lower than those in the matrix melt, respectively.

TL;DR: In this article, the authors show that shear deformation dramatically increases the magma permeability parallel to the shear direction via the enhancement of bubble coalescence and the networking of tube-like bubbles.

TL;DR: In this article, a series of deformation experiments on vesiculated rhyolitic melts by twisting columnar obsidians at a temperature of 975°C and at rotation rates of 0.3-0.5 rpm for up to 10 rotations were performed.

TL;DR: In this paper, the authors described the occurrence and chemical compositions of amphibole in the dacite, and also carried out melting experiments to determine the low-pressure stability limit of amphiboles.