Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29q.460d&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 460
Computer Science
Chemical Composition, Chondrites, High Temperature, Hypervelocity Impact, Silicates, Vaporizing, Glass, Impact Melts, Photoelectron Spectroscopy, Scanning Electron Microscopy, X Ray Spectroscopy
Scientific paper
We have studied the chemical differentiation of L chondrites (Tsarev and Etter) during high-temperature vaporization as part of our systematic investigation of chemical differentiation of Mg-rich silicates by simulated hypervelocity impacts. Vaporization of samples was performed in vacuum or He atmosphere by use of a powerful laser pulse. The laser beam created a shallow melt crater on the sample surface and a vapor cloud. The vapor phase was precipitated on a special metallic foil, which was placed in the path of the spreading vapor cloud. The condensed film was investigated layer by layer using X-ray photoelectron spectroscopy to get information about its chemical composition and structure. The results show similar trends as in the vaporization of Mg-rich minerals. The vapor cloud is enriched in Si and depleted in Mg and Ca. The vaporization of sulfide and metallic phases proceeds independently of silicate phases and results mainly in volatilization of S and depletion of Fe(0) and Fe(2+) in the condensate. The crater melt was studied in a cross section of the crater. A thin layer of melt glass covers the crater walls; the glass is finely devitrified and encloses small droplets of metal + sulfide. Larger splashes of sulfide-metal mixtures are found on the surface of the melt sheet. The composition of the melt glass was analyzed with an scanning electron microscope (SEM) by energy dispersive X-ray analysis.
Dikov Yu. P.
Gerasimov M. V.
Wlotzka Frank
Yakovlev O. I.
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