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Cosmic Ray Exposure Age Determinations of Cosmic Spherules from Marine Sediments

Published online by Cambridge University Press:  12 April 2016

Kazuo Yamakoshi*
Affiliation:
Institute for Cosmic Ray Research, University of Tokyo, Tanashi Tokyo 188, Japan
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Abstract

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The cosmic ray exposure ages of deep sea metalic lie spherules were determined by various methods; low level countings (Ni-59), neutron activation analysis (Mn-53), high energy accelerator mass spectrometry (Be-10, Al-26) and mass spectrometry (K isotopes). The exposure ages of 0.3 - 50 Ma were obtained. According to Poynting-Robertson effect, the starting points (supplying sources) are located at inner region of the orbit of Saturn.

Type
III. Interplanetary Dust: Laboratory Studies
Copyright
Copyright © Reidel 1985

References

[1] Yanagita, S.,Yamakoshi, K. and Imamura, M.: 1979, Proc.Intern.Conf.Cosmic Rays (Kyoto) OG-12-20.Google Scholar
[2] Raisbeck, G.M., Yiou, F., Klein, J., Middleton, R. and Yamakoshi, K.: 1982, Proc.45th Meteoriticai Soc.Meeting.Google Scholar
[3] Yamakoshi, K.,Ohashi, H. and Imamura, M.: 1982, Proc. 5th Intern.Conf.Geochronology (Nikko) pp 401-402.Google Scholar
[4] Kobayashi, K., Ohki, M. and Ohashi, H.: 1982, ibid. pp 186-187.Google Scholar
[5] Nogami, K. and Yamakoshi, K.; 1984, Geochem.J. in press.Google Scholar
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