Abstracts of Annual Meeting of the Geochemical Society of Japan
Abstracts of Annual Meeting of the Geochemical Society of Japan
Session ID : 3A15
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Host: Abstracts of Annual Meeting of the Geochemical Society of Japan

Heterogeneous cosmic-ray exposure record of the Norton County enstatite achondrite
*Hiroshi Hidaka, Shigekazu Yoneda
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Keywords: cosmic-ray exposure, neutron capture, samarium, gadolinium, isotope
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Abstract
Large and heterogeneous isotopic variations of 150Sm/149Sm and 158Gd/157Gd due to neutron capture reactions caused by cosmic-ray irradiation were found in chemical and mineral separates from the Norton County meteorite. The data provide evidence for an activity of the early Sun (T Tauri), suggesting the migration of early and intense irradiation materials into the Norton County meteorite parent body.
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© 2012 by The Geochemical Society of Japan
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