Some Consequences from Lead Isotopes in NaturenThe Genetic Nature and Seat of the Source Material of Magmas

摘要

The original material, the is a materiel representing the solid phase separated from the melt like high-alumina basalt magma, and the alkali olivine basalt is the predict of para melting of the material resembling the high-alumina basalt. The raptorial responsible for tholeiitic or Japan was suggested originally to be seated at 150 km, while that responsible for alkali olivine basalt at 310 kmnThe most frequent rources of the mother materials for leac in ores were also estimated to be at 150 km under the earth's surface, and it was inferred that such sources are very rare below 400 km and above 75 km within the earth.