| Budget Amount *help |
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2020: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2019: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2018: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
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| Outline of Final Research Achievements |
Understanding the evolution of granitic continental crust is central to deciphering the evolution of the solid Earth and surface environments. In this study, we have studied crustal evolution by using monazite. Monazite is a phosphate that can crystallize under a wide range of metamorphic conditions and from low-Ca granitic magma. Considering that monazite can retain its primary chemical and isotopic signatures during sedimentary processes, we measured U-Pb ages of detrital monazite grains from major world rivers. Furthermore, we determined trace element and Nd isotope compositions of the dated monazite grains. The data allow us to determine the precise timing and nature of orogenic events in the drainage areas. These results provide new constraints on the timing of major metamorphic events in the continental crust.
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