Isotopic compositions of potassium and calcium in magnetic spherules from marine sediments |
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| Authors: | Tadashi Shimamura Shohei Yanagita Kazuo Yamakoshi Ken&#x;ichi Nogami Okio Arai Yuji Tazawa Koichi Kobayashi |
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| Institution: | 1. Institute for Cosmic Ray Research, University of Tokyo, Tanashi Tokyo 188Japan;2. Laboratory of Physics, Dokkyo University, School of Medicine, Mibu, Tochigi 321-02Japan;3. Science and Engineering Research Laboratory, Waseda University, Shinjuku Tokyo 162Japan;4. Department of Physics, Faculty of Science, Kyoto University, Kyoto 606Japan;5. Department of Physics, Faculty of Science, Kyushu University, Fukuoka 812Japan |
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| Abstract: | Isotopic compositions of potassium and calcium in individual magnetic spherules were determined. No significant anomaly was observed for potassium within twice the statistical error (2σ), although for calcium isotopes enrichments of46Ca,44Ca and42Ca were observed in one spherule. The relative excess of46Ca,44Ca and42Ca in the spherule agrees with the relative yield of spallogenic calcium isotopes observed in iron meteorites. This fact indicates that the enrichment in the calcium isotopes was caused by cosmic ray irradiation of the spherule in outer space. |
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