著者

佐藤 景 石渡 明

出版者

The Geological Society of Japan

雑誌

日本地質学会学術大会講演要旨 (ISSN:13483935)

巻号頁・発行日

pp.212, 2013 (Released:2014-04-01)

著者

佐藤 景 石渡 明

出版者

一般社団法人 日本鉱物科学会

雑誌

岩石鉱物科学 (ISSN:1345630X)

巻号頁・発行日

vol.44, no.3, pp.155-170, 2015 (Released:2015-06-27)

参考文献数

52

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Ishikoshi Andesite is the Middle Miocene, amphibole-bearing, two pyroxene andesite lava flow located in the forearc area of the Northeast Japan arc, which covers the area of 8 km EW and 7 km NS and has the thickness of >180 m. In this study it is divided into peripheral lava (PL) and central lava (CL), which are distributed in the peripheral and central parts of the volcanic edifice, respectively. PL bears groundmass pigeonite or shows higher FeO*/MgO trend with fractionation and CL does not bear pigeonite and lower FeO*/MgO trend, therefore PL is tholeiitic and CL is calc-alkaline. PL shows petrological features that are compatible with crystallization differentiation. CL has several features that suggest magma mixing such as non-equilibrium plagioclase phenocrysts, but evidences for magma mixing are not robust. In comparison to similar lava flows, PL and CL seem to form a composite lava flow because clear geological boundary between PL and CL cannot be observed and FeO*/MgO ratio of CL tend to be higher in the marginal portion. We also find that two-pyroxene equilibrium temperature of CL (760-850 ℃)is lower than that of PL (970-990 ℃). CL should have been too viscous at this temperature (>1010 Pa·s in anhydrous state) to form a dike, thus it should have effused through the vent which PL formed to be composite lava flow with PL. Ishikoshi Andesite has columnar joints rather than platy joints. In comparison to other lava flows which have platy joints in Japan, it is possible that less anisotropic crystals, low eruption temperature (high viscosity) and/or large phenocryst size have prevented Ishikoshi Andesite from formation of foliation along which platy joints develop in the lava.

著者

遠藤 実 佐藤 景 杉山 謙樹 圓谷 建治

出版者

社団法人日本リハビリテーション医学会

雑誌

リハビリテーション医学 : 日本リハビリテーション医学会誌 (ISSN:0034351X)

巻号頁・発行日

vol.30, no.12, 1993-12-18

著者

伊藤 裕一 小川 登志男 田中 智基 佐藤 景一

出版者

木更津工業高等専門学校

雑誌

木更津工業高等専門学校紀要 (ISSN:2188921X)

巻号頁・発行日

vol.49, pp.1-6, 2016-01-29

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We have developed the creating and manufacturing contents for elementary school students to convey the attractiveness of mechanical engineering. In last year, we have developed the content related to fluid dynamics. The participants made a special model glider which was like "winged seed". In this year, we have developed the content using shape memory alloy. We demonstrated the unique properties of the shape memory alloy and then the participants made the strap of the shape memory alloy in the content.