New types of spherules from Antarctica - Meteoritic impact origin?

Details New types of spherules from Antarctica - Meteoritic impact origin? New types of spherules from Antarctica - Meteoritic impact origin?

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14.1199t&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 14, Dec. 1987, p. 1199-1202. Research supported by the National Institute of

Physics

Antarctic Regions, Chondrites, Meteoritic Composition, Spherules, Mineralogy, Neutron Activation Analysis, Perovskites, Size Distribution, X Ray Diffraction, X Ray Spectroscopy, Earth, Spherules, Origin, Source, Impacts, Meteorites, Spectrometry, Laboratory Studies, Neutron Activation Analysis, Inaa, X-Ray Methods, Xdp, Diffraction, Samples, Terrestrial, Rare Earth Elements, Enrichment, Size, Distribution, Flux, Eds, Spectra, Sem, Electron Microscopy, Chemistry, Mineralogy, Morphology, Parent Material, Comp

Scientific paper

Spherules collected from Antarctic ice have been studied by using instrumental neutron activation analysis, energy dispersive X-ray spectrometry and X-ray diffraction photography. Peculiar spherules, Ca-Ti-rich (perovskite) type (CTS) and Fe-Cr-Ni-rich type (FCN), were found in the Mizuho ice core at depths of 32 to 33.5 m. In the Allan Hills bare ice, only a "chondritic" type without depletion of Au and S (CAS) was recognized. All the results combine to suggest that CTS and FCN may be droplets strewn by the impact of a huge meteorite, and CAS must be debris from one of the chondrites that fell on the source region of the Allan Hills bare ice and survive terrestrial alterations.

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