Trace element concentrations in iron type cosmic spherules determined by the SR-XRF method
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概要
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The X-ray fluorescence method using synchrotron radiation (SR-XRF) was applied to determine trace element abundances in iron type (I-type) cosmic spherules collected at deep-sea sediments. Cr, Co, and Ni were detected from almost all spherules and average concentrations are 1336,2991ppm, and 4.0%, respectively. Ga, Ge, and Mn were detected from 20,30,and 20% of spherules and average concentrations are 4,4 and 486ppm, respectively. Spherules containing metallic cores were enriched in Ni and Co and depleted in volatile elements such as Ga and Ge relative to those without cores. The Ni and Co enrichments resulted from high concentrations of the elements in the metallic cores, while the Ga and Ge depletion might indicate that core-bearing spherules have experienced more severe heating during atmospheric entry than the core-lacking ones. On the basis of Mn concentration we divided spherules into two groups : high and low Mn groups. Trace element abundances of the low Mn group are systematically fractionated relative to those of iron meteorites : volatile elements are depleted and refractory ones are enriched in the spherules. This appears to be consistent with the hypothesis that I-type spherules are ablation products of iron meteorites that have lost volatile elements during melting. Production of the low Mn spherules by ablation of chondritic meteorites is also possible, but chondrite melting should have occurred under a limited range of oxygen fugacity in order to enrich Cr and remove Mn in the spherules. Spherules belonging to high Mn group show a complex trace element pattern when normalized to chondrites. A large Mn excess relative to Cr in this type of spherules can not be explained by any formation process, thus it is difficult to infer the precursor material of the Mn-rich spherules.
- 国立極地研究所の論文
著者
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NAKAMURA Tomoki
Department of Earth and Planetary Sciences, Kyushu University
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Iida Atsuo
Photon Factory Institute Of Materials Structure Science
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Takaoka Nobuo
Department Of Earth And Planetary Sciences Kyushu University
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Takaoka Nobuo
Department Of Earth And Planetary Science Faculty Of Science Kyushu University
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中村 智樹
Department Of Earth And Planetary Science Kyushu University
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Nakamura Tomoki
Earth and Planetary Sciences, Graduate School of Science, Kyushu University
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Nakamura Tomoki
Department Of Earth And Planetary Sciences Faculty Of Sciences Kyushu University
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Nakamura Tomoki
Department Of Earth And Planetary Sciences Graduate School Of Science Kyushu University
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Nakamura Tomoki
Department Of Earth And Planetary Science Faculty Of Science Kyushu University
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Nozaki Wataru
Department Of Earth And Planetary Science Faculty Of Science Kyushu University
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Nozaki Wataru
Department Of Earth And Planetary Sciences Kyushu University
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Matsuoka Kenji
Department Of Earth And Planetary Sciences Kyushu University
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Iida Atsuo
Photon Factory Institute Of Materials Structure Science High Energy Accelerator Research Organizatio
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Nakamura Tomoki
Department Of Earth And Planetary Sciences Kyushu University
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Nakamura Tomoki
Department Of Earth And Planetary Sciences Graduate School Of Sciences Kyushu University
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Nakamura Tomoki
Department Of Earth And Planetary Materials Science Faculty Of Science Tohoku University
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Matsuoka Kenji
Department of Aeronautics and Astronautics, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
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