| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
|
|---|
| Outline of Final Research Achievements |
Stagnation of the subducted Pacific slab in the mantle transition zone beneath eastern China has been imaged by seismic tomography. Late Cenozoic basaltic volcanoes lying above the stagnant slab, are distributed throughout eastern China. These basalts are rich in alkaline and incompatible trace elements that are typically associated with oceanic island basalts (OIBs). Such geochemical similarities between the basalts in eastern Asia and typical OIBs have led some researchers to conclude that the Chinese basalts originated from the upwelling of mantle, independent of a stagnant slab. According to the results of high-pressure experiments, melting of the stagnant slab could occur if the slab contains adequate amounts of H2O or CO2. In this study, we presented geochemical and petrological evidence that melts from the igneous layers in the stagnant Pacific plate slab have contributed to the source composition of basalts erupted in eastern China.
|
