S1: Earth materials science in igneous processes (Special Session)

[S1-07] Groundmass crystallization experiments of an andesitic pumiceunder low vapor pressure

「発表賞エントリー」

*Hiroki Yasukawa¹, Mayumi Mujin¹, Michihiko Nakamura¹, Shizuka Otsuki² (1. Tohoku Uni. Sci., 2. Nittetu Technology)

Keywords:Nanolite, Ultrananolite

In order to investigate the crystallization condition of nanoscale crystals (nanolite and ultrananolite), we performed the dehydration-induced crystallization experiments that simulate shallow conduit conditions. Ultrananolite crystallized at 800°C and LVP, and it took 2 hours to start crystallization. As compared with magnetite, pyroxene nanolite crystallized under wide temperature and pressure conditions. These results may constrain the pressure-temperature-time paths of magma in a shallow conduit.