Computer Science
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..405g&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 405.
Computer Science
Micrometeorites, Ice, Antarctic Regions, Silicon Dioxide, Minerals, Meteoritic Composition, Chondrites, Silicates, Grain Size, Magma
Scientific paper
Of the unmelted micrometeorites 50-100 microns in size recovered from Antarctic ice, almost half have compositions that diverge significantly from bulk CI. These 'non-chondritic' Antarctic micrometeorites (AMMs) are coarse-grained (i.e. the grain sizes are within an order of magnitude of the particle size) and consist primarily of anhydrous silicates. This paper reports the discovery of an unusual non-chondritic AMM (particle CP1-50-096) which contains free-silica. The paper also discusses the particle's possible genetic relations to silica-bearing objects in meteorites. The results show that particle CP91-50-096 has general characteristics common to the majority of silica-bearing magmatic objects within chondritic meteorites. Particle CP91-50-096 has a texture which suggests a magmatic origin and has mineral compositions which are reminiscent of silica-bearing chondrules in both CM and K chondrites.
Genge Matt J.
Grady Michael
Hutchison Robert
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