著者

Risako HATADA Hidemi ISHIBASHI Yukiko SUWA Yusuke SUZUKI Natsumi HOKANISHI Atsushi YASUDA

出版者

Japan Association of Mineralogical Sciences

雑誌

Journal of Mineralogical and Petrological Sciences (ISSN:13456296)

巻号頁・発行日

pp.190724, (Released:2020-06-26)

被引用文献数

1

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We conducted textural and chemical analyses of melt inclusions and their host plagioclase crystals in the scoria of the Izu–Omuroyama monogenetic volcano, erupted at ~ 4 ka in the Higashi–Izu monogenetic volcanic field, Japan. The groundmass melt was andesitic with ~ 59–61 wt% SiO2, and it contained abundant microphenocrysts of olivine and plagioclase. In contrast, ~ 59% of the plagioclase–hosted melt inclusions have rhyolitic compositions with ~ 70–75 wt% SiO2. The host plagioclase phenocrysts have cores with An# of 44.7 ± 4.2 [An# = 100Ca/(Ca + Na) in mol] and rims with An# of 68–78, and the calcic rims have compositions similar to the microphenocrysts. The cores of the host plagioclase phenocrysts have FeO* and K2O contents that are in equilibrium with the rhyolitic melt inclusions. Using the plagioclase–melt geohygrometers and assuming temperatures of 790–850 °C, we estimated the H2O contents of the rhyolitic melt inclusions to be ~ 4.4–10.2 wt%, indicating H2O–saturation depths of >4.5 km. Our results suggest that an inhibited reservoir of plagioclase–bearing rhyolitic melt existed beneath the monogenetic volcano at the time of the scoria eruption, which was ~ 800 years earlier than the first rhyolitic eruption in the volcanic field. Plagioclase content in the silicic reservoir is estimated to be less than 35.8%, suggesting the magma was eruptible. Our results demonstrate the potential usefulness of plagioclase–hosted melt inclusions for indicating the existence of such an inhibited silicic magma.

著者

Atsushi Yasuda

出版者

The Botanical Society of Japan

雑誌

植物学雑誌 (ISSN:0006808X)

巻号頁・発行日

vol.34, no.408, pp.179-180, 1920 (Released:2007-05-24)

著者

Atsushi Yasuda

出版者

The Botanical Society of Japan

雑誌

植物学雑誌 (ISSN:0006808X)

巻号頁・発行日

vol.31, no.367, pp.en208-en209, 1917 (Released:2011-01-26)

参考文献数

2

被引用文献数

1 2

著者

Atsushi Yasuda

出版者

The Botanical Society of Japan

雑誌

植物学雑誌 (ISSN:0006808X)

巻号頁・発行日

vol.35, no.420, pp.en219-en221, 1921 (Released:2007-05-24)

著者

Atsushi YASUDA Hiroki KAMEDA Toshihiro KAMEDA

出版者

(一社)日本航空宇宙学会

雑誌

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN (ISSN:18840485)

巻号頁・発行日

vol.14, no.ists30, pp.Pu_7-Pu_14, 2016 (Released:2016-11-26)

被引用文献数

1

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Since the effective satellite-based education and outreach methods has not been clarified so far, we researched satellites in the world and their activities in order to extract essential issues from the viewpoints of successful education and outreach. As the results, we found the following three key points are all required for successful space education and outreach with satellites; "No limit type": the satellite everyone can use, "Participation type": the satellite users can participate in its mission, and "Interaction type": the satellite users can interact each other. Furthermore, as the example to fulfill these key points, we introduce CubeSats, ITF-1 and ITF-2 developed by University of Tsukuba YUI Project, with their missions and activities related with space education and outreach.