| Budget Amount *help |
¥20,280,000 (Direct Cost: ¥15,600,000、Indirect Cost: ¥4,680,000)
Fiscal Year 2013: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2012: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
Fiscal Year 2011: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000)
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| Research Abstract |
We obtained chemostratigraphies of C, O, Sr, Fe and Ca isotopes and Fe, Mn, REE and P contents of carbonates, Mo isotopes of black shales and C and N of organic matter from the Ediacaran to the Early Cambrian to estimate primary productivity, continental influx, temperature, nutrient contents, and redox condition of seawater, using twenty-four drill cores in South China. The results suggest that the emergence of Metazoan was caused under the less oxic and P-rich condition, whereas the diversification occurred under oxic, nitrate and Ca-rich condition. Especially, the transition from P to nitrate-rich seawater contributed to more actively mobile metazoans through increase in Redfield ratio. The biological evolution occurred just after increase in nutrients, allowing a new insight of biological evolution of metazoans. The quick response of biological evolution to the environments suggests that the fundamental base for biological functions were already established before the emergence.
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