| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
Green spinel, corundum and diaspore were found in primitive troctolites recovered from Hess Deep, East Pacific Rise. This is the first discovery of these aluminous minerals from the in-situ oceanic crust. Petrological studies revealed that the aluminous minerals were formed by high-temperature acidic hydrothermal fluids and subsequent alteration during cooling of the magmatic lower crustal rocks. In addition, it was revealed that serpentinization took place at three-stage alteration by fluids with variable silica and oxygen activities, and that magnetite formed at multiple stages under high and low temperature conditions. All of these findings are important for further understanding of hydrothermal activities near the fast-spreading axes.
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