Bismuth in interplanetary dust

Mackinnon, Ian D.R. & Rietmeijer, Frans J.M. (1984) Bismuth in interplanetary dust. Nature, 311(5982), pp. 135-138.

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Abstract

Samples of a large (~60 µm) chondritic porous (CP) aggregate collected from the stratosphere have been analysed in detail by analytical electron microscopy (AEM). Previous studies of CP aggregates have shown that they are extraterrestrial in origin1–3 and may be related to cometary debris4. CP aggregates are dissimilar to C1 and C2 carbonaceous chondrite matrices and many have not been significantly altered by thermal or radiation processes since their assembly5. We report here a high concentration of Bi2O3 grains within the large CP aggregate designated W7029* A (~60 µm) and suggest they formed by rapid heating (~300 °C) of elemental Bi grains within the aggregate during atmospheric entry. We examine the possibilities for terrestrial Bi contamination of CP aggregate W7029* A but judge them unlikely. Enrichment of elemental Bi within components of extraterrestrial materials is consistent with a nebula condensation model6 and implies that Bi within CP aggregate W7029* A may have formed at a late stage of the condensation process.

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ID Code: 55649
Item Type: Journal Article
Refereed: Yes
Additional Information: GeoRef, Copyright 2009, American Geological Institute.
1985-018640
AEM data
Keywords: bismuth, carbonaceous chondrites, cosmochemistry, geochemistry, interplanetary dust, interplanetary space, metals, meteorites, SEM data, solar nebula, stony meteorites, stratosphere, TEM data
DOI: 10.1038/311135a0
ISSN: 0028-0836
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Extraterrestrial Geology (040302)
Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Mineralogy and Crystallography (040306)
Divisions: Current > Institutes > Institute for Future Environments
Deposited On: 30 Jan 2013 23:19
Last Modified: 07 Feb 2013 03:25

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