Title

On Noble Gas Anomalies in the Great Namaqualand Troilite

Abstract

The abundances and isotopic composition of the stable noble gases were measured in a troilite nodule from the Great Namaqualand fine octahedrite. Helium, neon and argon show a significant spallation component. The major anomalies in krypton and xenon are from neutron capture on selenium and tellurium and from the decay of extinct I129. The abundances of tellurium, iodine and uranium in the troilite were determined by neutron activation analyses and compared with the xenon anomalies. The results indicate that part of the excess Xe129 is from neutron capture on tellurium and the remainder is due to the retention of radiogenic Xe129 from the decay of extinct I129, about 200 million years after an initial I129/I127 = 3 × 10-3.

Department(s)

Chemistry

International Standard Serial Number (ISSN)

09320784

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1968 Verlag der Zeitschrift fur Naturforschung, All rights reserved.


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