On the Geochemical Studies of Stable Isotopes:(III)On the Estimation of the Isotope Ratio in the Mantle
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概要
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Up to the present time, the question of the chemical composition in the interior of the earth and of the isotopic ratio in those parts has been debated. It is supposed that the average composition of the interior layer of the earth resemble that of certain types of rocks and meteorites. For example, the interior may be represented by dunite, eclogite and peridotite. Or it can be represented by meteoritic composition. For any theories concerning the model composition of the interior, one might conclude that elements such as Li, Na, K, Ca, Al, and halogens are concentrated toward the earth's surface, while S, Mg, Fe, and Ni are enriched in the deeper layer. In order to estimate the isotope ratio in the mantle, the following cases are discussed. (1)The isotope ratio in the mantle might have a composition similar to the meteoritic value. (2)The isotope ratio in the mantle might have a composition similar to the terrestrial value. And(3)the isotope ratio in the mantle is different from that of the meteoritic composition or of the terrestrial composition. The mean value of isotopic compositions for the mantle must be important in order to estimate it in the nuclear synthesis theory or in the cosmo-chemistry.
- 日本質量分析学会の論文
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