| Budget Amount *help |
¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000)
Fiscal Year 2013: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Fiscal Year 2012: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2011: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
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| Outline of Final Research Achievements |
We have developed an analytical method for simultaneous determination of ultratrace-amounts of halogens and noble gases by using neutron-irradiation and noble gas mass spectrometry. Halogens and noble gases in mantle-derived peridotite xenoliths from subduction zones shares sedimentary pore-fluid-like signature with mantle peridotites and serpentinites from the Sanbagawa metamorphic belt in Shikoku, southwest Japan. Eclogites and metasediments from the Sanbagawa metamorphic belt contain a Cl-rich component, which is typical of altered oceanic crust, in addition to the sedimentary pore-fluid-like component. These observations indicate that mantle wedges beneath subduction zones are significantly and widely metasomatized by subducted components with respect to halogens and noble gases.
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