古代海水温度の測定 (年代測定特集号)
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概要
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Principle and experimental method of paleotemperature analysis were reviewed. The temperature coefficient of equilibrium constant of exchange reaction of oxygen atom between water and carbonate is large enough to enable us to calculate temperature of formation of carbonate in water. By the recent development of mass spectrometric and experimental techniques for the measurement of isotopic ratio of oxygen, paleotemperature can be measured within the experimental error of ±0.5°C and the development is completely attributed to the effort of Urey group. Japanese mass spectrometer such as Hitachi RMU-6 and RMS-4 can be used satisfactorily for this purpose. The development of other temperature scale such as phosphateand silicate-scale is strongly desired to eliminate the hypothesis that the old ocean water had the same oxygen-18 content as that of the present day.
- 日本第四紀学会の論文