Research Project code：0450021643
Update date：Jan. 19, 2004
Restriction on the dimension of original region inside the mantle
2002 - 2002
It has been known that there is a region having an original helium isotope ratio in the mantle. The original region is warmed up by the heat generated by the radioactive element inside, and the region is possibly floated up by the buoyancy caused thereby. Conditions for not causing such hydrokinetic in both cases that the original region has a spherial shape and that it has a layered shape. It was indicated that the original region made movement by the buoyancy when the size of the dimension is several kirometers or more, if the region is made of a material having a greater density than other regions.
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