Transparent Minerals and Silicate Glass in Shock-Produced Melts
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Two different assemblages of olivine and pyroxene in the melt phase were observed in the Yanzhuang shock-produced melt. The coarse-grained assemblage was formed from solid-state recrystallizations of olivine and pyroxene. The fine-grained assemblage was crystallized from shock- produced silicate melt. It was revealed that the chemical compositions of olivine and pyroxene in the coarse-grained assemblage are similar to that in the unmelted chondritic rock, but the CaO-, Al2O3-, and Cr2O3-contents of olivine in the fine-grained assemblage are slightly higher than that in the unmelted chondritic rock. The compositions of pyroxene in the fine-grained assemblage vary widely, and its CaO-, Al2O3-, and Cr2O3-contents are higher than the counterpart in the unmelted chondritic rock. The chemical compositions of silicate glass vary widely. Some silicate glass contains 48.12% SiO2, and the others contain 71.7% SiO2. A number of tiny spherules of FeNi metal solidified from vaporized FeNi were observed in the interstices of silicate minerals.
KeywordsTransparent minerals Olivine Pyroxene Silicate glass Shock-produced melt
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