Extraterrestrial platinum group nuggets in deep-sea sediments

Details Extraterrestrial platinum group nuggets in deep-sea sediments Extraterrestrial platinum group nuggets in deep-sea sediments

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.309..693b&link_type=abstract

Nature (ISSN 0028-0836), vol. 309, June 21, 1984, p. 693-695.

Mathematics

Logic

35

Atmospheric Entry, Geochemistry, Group 8 Compounds, Metal Particles, Meteoritic Composition, Micrometeorites, Abundance, Chondrites, Oxidation, Platinum, Primitive Earth Atmosphere, Sediments

Scientific paper

A previously unrecognized property of iron cosmic spheres is reported. The most common spheres larger than 300 microns do not, in fact, contain FeNi metal cores, but instead contain a micrometer-sized nugget composed almost entirely of platinum group elements. These elements appear to have been concentrated by the oxidation of molten meteoritic metal during atmospheric entry. This process is critically dependent on the relative abundance of oxygen in the atmosphere, and the first appearance of the nuggets in the geological record may provide a marker indicating when the oxygen abundance attained half of its present level.

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