Primordial rare gases in Belgica-7904 (C2) carbonaceous chondrite

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概要

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• Belgica-7904 (C2) carbonaceous chondrite was analyzed for rare gas isotopic compositions with stepwise heating extraction method. Primordial rare gases are dominant, whereas the concentrations of radiogenic ^4(He) and ^<40>(Ar) are lower than those to be expected from radioactive decay. Cosmic-ray exposure age of 0.7 my was obtained with cosmogenic ^<21>(Ne). Ne-E component was found in a 900-1100℃ range and its concentration was 1.2×(10)^<-9>(cm)^3 STP/g. Excessive heavy Xe isotopes in a 900℃ fraction have CCF-Xe spectrum. ^<20>(Ne), ^<84>(Kr) and ^<132>(Xe) in the highest temperature fraction of 1800℃ are enriched. The enrichments may be due to a stellar nucleosynthesis or due to a neutron irradiation of high temperature condensates.

• 国立極地研究所の論文

著者

• Nagao Keisuke

  Okayama University Of Science

• Inoue Kensaku

  Okayama University of Science

• Ogata Koreichi

  Okayama University of Science

関連論文

• Primordial rare gases in Belgica-7904 (C2) carbonaceous chondrite
• Rare gas studies of sixteen stony meteorites from Antarctica
• Rare gas studies of twenty-four antarctic chondrites
• Present Status of the Two Stage Double Focusing Mass Spectroscope at Osaka University

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