5:15 PM - 6:45 PM
[SCG54-P07] Mysterious bubble shapes in the lava from Doyo Seamount
Keywords:Doyo Seamount , Bubble
The size and shape of bubbles in volcanic rocks are thought to record phenomena that occur during eruptions and have been studied. Recently, the microstructures of lava from submarine volcanoes have been analyzed extensively. In this study, we report the results of CT imaging analysis of the lava from Doyo Seamount.
Doyo Seamount is located in the Izu-Ogasawara arc and about 50 km north of Nishinoshima. It is a large stratovolcano with a peak water depth of 400 m, a base water depth of 3,200 m, and a height of 2,800 m. In 2018, the Shinkai 6500 submersible collected samples.
The lava from Doyo Seamount is ankaramite in which most of the phenocrystals are pyroxene (Tamura et al. in preparation). In sample 6K1519-R08, which contains particularly large phenocrystals, a mysterious bubble structure is observed, as if another magma flowed into a large bubble and small bubbles are nucleated within it. The measured size distribution of bubbles shows two characteristic sizes. We would like to discuss the origin of this mysterious bubble.
Doyo Seamount is located in the Izu-Ogasawara arc and about 50 km north of Nishinoshima. It is a large stratovolcano with a peak water depth of 400 m, a base water depth of 3,200 m, and a height of 2,800 m. In 2018, the Shinkai 6500 submersible collected samples.
The lava from Doyo Seamount is ankaramite in which most of the phenocrystals are pyroxene (Tamura et al. in preparation). In sample 6K1519-R08, which contains particularly large phenocrystals, a mysterious bubble structure is observed, as if another magma flowed into a large bubble and small bubbles are nucleated within it. The measured size distribution of bubbles shows two characteristic sizes. We would like to discuss the origin of this mysterious bubble.