Remnant extraterrestrial noble gases in Antarctic cosmic spherules

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概要

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• Noble gas abundances in Antarctic cosmic spherules collected from the Tottuki Point on the Soya Coast, Antarctica, are considerably lower than those reported in unmelted micrometeorites, indicating severe heating of the cosmic spherules during atmospheric entry. Although ^3He was below detection limits (2 X 10^<-15> cm^3 STP) in most spherules, ^3He was detectable in three spherules and their ^3He/^4He ratios were close to those of unmelted micrometeorites. Ne and Ar abundances and isotopic compositions were determined for more than half of the spherules. Thirteen samples had high ^<21>Ne/^<22>Ne ratios, possibly reflecting the presence of cosmogenic ^<21>Ne, although blank corrections could not be made for most samples due to the low Ne concentrations. Eight particles had ^<40>Ar/^<36>Ar ratios lower than the atmospheric value of 296, and five of them also had SEP (solar energetic particles)-like Ne, confirming their extraterrestrial origin. These spherules apparently preserve extraterrestrial noble gases in their interiors in spite of severe heating. Sample To440080 has ^<40>Ar/^<36>Ar ratio (566.3±14.8) higher than that of terrestrial atmosphere in spite of the presence of SEP-like Ne, indicating different source material from some spherules and micrometeorites. Extraterrestrial Ne and Ar were not identified in 22 of 31 analyzed spherules, although relative noble gas abundances of fifteen spherules were similar to those of unmelted micrometeorites and clearly distinguishable from terrestrial materials such as terrestrial basalt, air, and water, reflecting their extraterrestrial origin. Since noble gas abundances in Antarctic spherules can be explained as mixtures of solar and Q-components and the contribution of adsorption air is insignificant, a majority of these Antarctic spherules represent accreted extraterrestrial material and are not volcanic products.

• 国立極地研究所の論文

著者

• NAGAO KEISUKE

  Laboratory for Earthquake Chemistry, Graduate School of Science, The University of Tokyo

• Takaoka Nobuo

  Department Of Earth And Planetary Sciences Faculty Of Sciences Kyushu University

• Takaoka N

  Department Of Earth And Planetary Sciences Faculty Of Science Kyushu University

• Osawa Takahito

  Laboratory For Earthquake Chemistry Graduate School Of Science The University Of Tokyo

• Osawa Takahito

  Laboratory For Earthquake Chemistry Graduate School Of Science University Of Tokyo

• NOGUCHI Takaaki

  Department of Minerals and Biological Sciences, Ibaraki University

• Nagao Keisuke

  Laboratory For Earthquake Chemistry Graduate School Of Science The University Of Tokyo

• Nagao Keisuke

  Laboratory For Earthquake Chemistry Faculty Of Science The University Of Tokyo

• Noguchi Takaaki

  Department Of Materials And Biological Sciences Ibaraki University

• Noguchi Takaaki

  Department Of Earth Sciences Ibaraki University

• Nakazawa Ayako

  Department of Materials and Biological Sciences, Ibaraki University

• Mikada Jyun-ichi

  Department of Materials and Biological Sciences, Ibaraki University

• Mikada Jyun-ichi

  Department Of Materials And Biological Sciences Ibaraki University

• Nakazawa Ayako

  Department Of Materials And Biological Sciences Ibaraki University

• Nagao Keisuke

  Geochemical Research Center Graduate School Of Science University Of Tokyo

• Noguchi Takaaki

  Department of Earth Science, Faculty of Science, Ibaraki University

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