| Project/Area Number |
25400508
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Economic geology
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| Research Institution | University of Tsukuba |
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Principal Investigator |
ARAKAWA Yoji 筑波大学, 生命環境系, 教授 (00192469)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUI Tomoaki 鹿児島大学, 教育学部, 准教授 (40295233)
池端 慶 筑波大学, 生命環境系, 助教 (70622017)
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| Co-Investigator(Renkei-kenkyūsha) |
IKEHATA Kei 筑波大学, 生命環境系, 助教 (70622017)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 灰長石巨晶 / 島弧火山 / 微小包有物 / 灰長石 / マグマ混合 / 自然銅・真鍮 / Fe硫化物 / 島孤火山 |
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| Outline of Final Research Achievements |
Ca-rich plagioclase (anorthite) megacrysts occurs as disequilibrium crystals n island arc volcanic rocks. The purpose of this study is to clarify chemical and mineralogical characteristics of the anorthite megacryst and micro inclusions. Our study was focused on the anorthite megacryst in volcanic rocks in Take-shima (S. Kyushu), Hokiyadake volcano (central Japan), and Miyakejima volcano in Izu volcanic arc. In the Take-shima volcano, anorthite megacrysts often contain micro inclusions that were identified to be native iron (Fe). Yellow colored anorthite megacrysts in Hokiyadake volcano are thought to be a result of substitution of Fe for Alin crystal structure. In Miyakejima volcano, disordered distribution of Si/Al in anorthite crystal structure was identified. This finding is interpreted as metastable phase of the anorthite megacryst.
The growth of the anorthite megacrysts were interpreted to be due to rapid changing of phyisical condition nearly at melting temperature of anorthite.
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