Trace-element analysis by INAA of micrometeorites from Antarctica

Details Trace-element analysis by INAA of micrometeorites from Antarctica Trace-element analysis by INAA of micrometeorites from Antarctica

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29r.481k&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 481-482

Mathematics

Logic

Antarctic Regions, Interplanetary Dust, Meteoritic Composition, Micrometeoroids, Trace Elements, Chemical Composition, Chondrites, Mineralogy, Neutron Activation Analysis, Scanning Electron Microscopy

Scientific paper

In continuation of our earlier studies of Antarctic micrometeorites (MMs), we have studied 20 more MMs for mineralogical and chemical composition, using neutron activation analysis (INAA), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA). The particles were selected from the 100-400 micron size fraction of the dust collections from the blue ice near the French station Dumont d'Urville. Masses of the extraterrestrial particles were in the 1.5-6 micrograms range, except for a cosmic spherule (59 micrograms). Six of the 20 dust particles turned out to be terrestrial (5M6, 5M7, 5M9, 6M1, 6M7, 6M8). Of the extraterrestrial particles, eight are scoriaceous (5M2, 5M3, 5M5, 5M8, 5M10, 6M3, 6M4, 6M6), three are unmelted (6M10, 6M11, 6M12), and one is a cosmic spherule (5M1). Two particles could not be classified by SEM (6M2, 6M5) because they were lost after INAA. Some characteristic compositions are given. All extraterrestrial particles have high contents of Cr, Fe, Co, Os, Ir, and Au, and most show roughly chondritic abundances and interelement ratios. Nevertheless, the Ni/Co, Ni/Ir, and Ni/Au ratios in the MMs are slightly lower than the CI values, because the particles are depleted in Ni. This agrees with earlier measurements of Antarctic MMs, larger cosmic spherules, and Interplanetary Dust Particles (IDPs).

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