Hostname: page-component-5cf477f64f-h6p2m Total loading time: 0 Render date: 2025-04-06T20:21:55.008Z Has data issue: false hasContentIssue false
  • English
  • Français

Noble Metal Enrichments in Cosmic Spherules

Published online by Cambridge University Press:  12 April 2016

K. Nogami ,
K. Misawa ,
R. Omori ,
M. Jianguo  and
K. Yamakoshi
K. Nogami
Affiliation:
General Education, Dokkyo Univ. School of Medicine Mibu, Shimotsuga, Tochigi, 321-02, Japan
K. Misawa
Affiliation:
Institute of Cosmic Ray Research, TOKYO Univ. Tanashi, Tokyo, 188Japan
R. Omori
Affiliation:
General Education, Dokkyo Univ. School of Medicine Mibu, Shimotsuga, Tochigi, 321-02, Japan
M. Jianguo
Affiliation:
Appl, Nucl. Tech. Div., Inst. High Energy Phys. Academia Sinica, Beijing.China
K. Yamakoshi
Affiliation:
Institute of Cosmic Ray Research, TOKYO Univ. Tanashi, Tokyo, 188Japan

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

In this work, studies on relationships of chemical compositions between fusion crust and nucleus in iron spherules are reported. More than 10% of the iron spherules which were picked out from deep sea sediment, have cores and crusts. We were able to divide three of them into cores and crusts. Each cores and crusts were analyzed individually by INAA. The core mainly consists of iron and nickel. Other trace elements, especially noble metal Au and Ir were concentrated in the core. The mechanism of core formation in the iron spherules shows us the origin of them.

Type
Interplanetary Dust: Physical and Chemical Analysis
Information
International Astronomical Union Colloquium , Volume 126: Origin and Evolution of Interplanetary Dust , 1991 , pp. 105 - 108
Copyright
Copyright © Kluwer 1991

References

Brownlee, D.E., Bates, B.A. and Wheelock, M.M., (1984) ‘Extraterrestrial platinum group nuggets in deep-sea sediments’, Nature, 309, 693–695 Google Scholar
Robin, E., Jehanno, C. and Maurette, M. (1987) ‘Characteristics and origin of Greenland Fe/Ni cosmic grains’, Proc. 18th LPSC, 593–598 Google Scholar
Yamakoshi, K. (1984) ‘Chemical compositions of magnetic spherules from deep-sea sediments determined by instrumental neutron activation analysis’, Geochemical J., 18, 147–152 Google Scholar