琉球石灰岩ならびにその関連物質の希土類元素,スカンジウム,ハフニウム,セシウム,ヒ素およびアンチモニウムの含有量

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Rare Earth Elements (REE), Sc, Hf, Cs, As and Sb content of Ryukyu Limestone and associated materials have been determined by activation analysis at Kyoto University Reactor Institute. The following results were obtained: 1) REE, Sc, Cs, As and Sb contents in crystalline and hard type of Ryukyu Limestone are found to be slightly higher than those in the others such as soft and powdered types. 2) There are no significant differences in REE contents of Ryukyu Limestone and associated materials. 3) Average Sc content of Ryukyu Limestone is 1.41 ppm, which is comparable with the values in the samples from nonlimestone areas. 4) Marine sediment contains relatively high As content with the average of 50.2 ppm whereas it is only 3.78 ppm in Ryukyu Limesotne. 5) Distribution pattern of REE in Ryukyu Limestone and associated materials displays a higher contents in light mass region than that in heavy mass region, which exhibits a negative Eu anomaly but not for a negative Ce anomaly. The REE distribution pattern appears like almost the same with that in the surface sea water, which may indicate to be influenced by sea water. 6) Resolution experiments for activated samples by a nuclear reactor led to the results that REEs are concentrated in carbonate fraction in the samples with low Si0_2 content whereas they are fractionated in aluminosilicates in samples with high Si0_2 content. 7) Sc is concentrated in silicate fraction of any samples regardless to Si0_2 content. 8) Elemental correlations have been discussed with inter-elemental con-elation coefficients.

琉球石灰岩ならびにその関連物質の希土類元素,スカンジウム,ハフニウム,セシウム,ヒ素およびアンチモニウムの含有量

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