High temperature heating of the Allende meteorite

Details High temperature heating of the Allende meteorite High temperature heating of the Allende meteorite

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42..903n&link_type=abstract

(International Conference on Experimental Trace Element Geochemistry, Sedona, Ariz., Sept. 12-16, 1977.) Geochimica et Cosmochim

Computer Science

11

Chemical Analysis, High Temperature Tests, Meteoritic Composition, Arc Heating, Electron Probes, Microanalysis, Neutron Activation Analysis, Resistance Heating, Neutron Activation Analysis, Electron Probe, Allende Meteorite, High Temperature, Temperature, Chemical Composition, Samples, Meteorite, Chondrules, Refractory Elements, Origin, Element Ratios, Trace Elements, Condensation

Scientific paper

Using dc arc and resistance heating, Allende bulk samples have been heated to 2000 C to determine if the chemical composition of CAI can be found through the fractional vaporization of pre-solar matter as approximated by the bulk Allende composition. Instrumental neutron activation analyses and an electron probe analyzer have been used to evaluate the chemical composition of the evaporation residues. The evaporation sequence observed was: (Na)-(Fe, Ni, Co, Au, Ir)-(Fe, Mn, Cr)(Mg, Si)-(Al, Ca, Ti, Sc, REE). Agreement is found between the chemical compositions of 65% and 4% residual fractions and a chondrule and a Ca-, Al-rich inclusion of the meteorite. At an early heating stage iridium was lost. The early loss of refractory siderophile elements may indicate whether Allende Ca-, Al-rich inclusions originated from early condensates for evaporation residue.

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