Shock experiments with the H6 chondrite Kernouvé: Pressure calibration of microscopic shock effects

Details Shock experiments with the H6 chondrite Kernouvé: Pressure calibration of microscopic shock effects Shock experiments with the H6 chondrite Kernouvé: Pressure calibration of microscopic shock effects

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35..545s&link_type=abstract

Meteoritics & Planetary Science, vol. 35, no. 3, pp. 545-560 (2000).

Computer Science

32

Scientific paper

Shock recovery experiments were carried out on samples of the H6 chondrite Kernouvé at shock pressures of 10, 15, 20, 25, 30, 35, 45 and 60 GPa and preheating temperatures of 293 K (low-temperature experiments) and 920 K (high-temperature experiments), respectively. Using a calculated equation of state of Kernouvé pressure pulse durations of 0.3 to 1.2 μs were estimated. The shocked samples were investigated by optical microscopy to calibrate the various shock effects in olivine, orthopyroxene, oligoclase and troilite. The following pressure calibration is proposed for silicates: (1) undulatory extinction of olivine <15 GPa, (2) weak mosaicism of olivine from 10-15 GPa to 20-25 GPa, (3) onset of strong mosaicism of olivine at 20-25 GPa, (4) transformation of oligoclase to diaplectic glass completed at 25-30 GPa (low-temperature experiments) and at 20-25 GPa (high-temperature experiments), respectively, (5) onset of weak mosaicism in orthopyroxene is at 30-35 GPa (low-temperature experiments) and at 25-30 GPa (high-temperature experiments), respectively, and (6) recrystallization or melting of olivine starting at 45-60 GPa (low-temperature experiments) and at 35-45 GPa (high-temperature experiments), respectively, and completed above 45-60 GPa in the high-temperature experiments. Troilite displays distinct differences between the samples shocked at low and high temperatures. In the low-temperature experiments the following effects can be observed in troilite: (1) undulatory extinction up to 25 GPa, (2) twinning up to 45 GPa, (3) partial recrystallization from 30 GPa to 60 GPa and (4) complete recrystallization above 35 GPa, whereas in the high-temperature experiments troilite shows (1) complete recrystallization from 10 GPa up to 45 GPa and (2) melting and crystallization above 45 GPa. Localized shock-induced melting is observed in samples shocked to pressures above 15 GPa in the high-temperature experiments and above 30 GPa for the low-temperature experiments, respectively, in the form of FeNi metal and/or troilite melt injections and intergrowths, and as pockets and veins of whole rock melt. Obviously, the onset and abundance of shock-induced localized melting strongly depends on the initial temperature of the sample.

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