| Budget Amount *help |
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2014: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2013: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2012: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Fiscal Year 2011: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
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| Outline of Final Research Achievements |
This study presents a new view of the constituent rocks in the lower crust and uppermost mantle beneath the strain concentration zone along the eastern margin of Japan Sea of northeast Japan based on the P- and S-wave velocities obtained by seismic tomography and comparisons with the experimentally determined velocities of rock-forming minerals. We inferred that orthpyroxene exist in the high velocity lower crust as a main constituent mineral beneath the the eastern margin of Japan Sea of northeast Japan, underlain by high Vp/Vs anomaly (clinopyroxenite) in the uppermost mantle. These inferences suggest that the Miocene rift-related magmatism produced the high velocity lower crust and the high Vp/Vs uppermost mantle. Considering the regional distribution of these unusual uppermost mantle rocks, strain concentration is inferred to have related with rheological property of the unusual uppermost mantle.
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