Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..931n&link_type=abstract
Lunar and Planetary Science, volume 27, page 931
Computer Science
Chondrites: Equilibrated, Gandolfi Camera, Plagioclase Thermometer, Temperature: Metamorphic, X-Ray Powder Pattern
Scientific paper
Individual plagioclase grains of about 50 micrometers in size from H6, L6 and LL6 chondrites were X-rayed by a Gandolfi camera after the analysis of chemical compositions by an electron probe microanalyzer. The X-ray powder pattern recorded on a film was scanned by a microdensitometer and taken into a personal computer for precise examinations. The distance between 1-31 and 131 reflections in the x-ray powder pattern which is very sensitive to the structural state and correlates to the equilibration temperature of plagioclase was determined precisely by applying a profile-fitting technique. The distance between 1-31 and 131 reflections was corrected for the influence of Or content by using the correction diagram. The maximum temperatures for H6, L6 and LL6 chondrites obtained by using the relation diagram between [2 theta(131)-2 theta(1-31)] and equilibration temperature are 755, 840, and 830 degrees C, respectively.
Motomura Yoshinobu
Nakamuta Yoshihiro
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