On Noble Gas Anomalies in the Great Namaqualand Troilite

Author

Emmit Calvin Alexander Jr.
Jane Hanisch Bennett
Oliver Manuel, Missouri University of Science and TechnologyFollow

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.

Recommended Citation

E. C. Alexander et al., "On Noble Gas Anomalies in the Great Namaqualand Troilite," Zeitschrift fur Naturforschung A, vol. 23, no. 9, pp. 1266 - 1271, Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences, Sep 1968.

The definitive version is available at https://doi.org/10.1515/zna-1968-0905

Department(s)

Chemistry

International Standard Serial Number (ISSN)

0932-0784

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

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

Publication Date

01 Sep 1968