Shock recovery experiments with the H6 chondrite Kernouve at preshock temperatures of 293 and 920 K

Details Shock recovery experiments with the H6 chondrite Kernouve at preshock temperatures of 293 and 920 K Shock recovery experiments with the H6 chondrite Kernouve at preshock temperatures of 293 and 920 K

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29r.529s&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 529-530

Computer Science

5

Chondrites, Meteoritic Composition, Shock Heating, Temperature Effects, Olivine, Pressure Effects, Pulse Duration, Pyroxenes, Recrystallization, Troilite

Scientific paper

Shock experiments were carried out to calibrate the shock classification system for ordinary chondrites to elaborate for the first time differences between chondrites shocked at room and high temperature. Shock-loading experiments at preshock temperatures of approximately 293 and 920 +/- 5 K were performed on sample disks of the H6 chondrite Kernouve which is one of the best examples of an unshocked chondrite. For the experiments at 920 K the sample containers were heated externally in a furnace and the setup was modified slightly. Peak-shock pressures of 10, 15, 20, 25, 30, 35, 45, and 60 GPa with pressure pulse durations between 0.2 and 0.8 microsec were achieved by reverberation technique. After the experiment the samples were quenched immediately. The microscopic shock effects visible in thin sections are summarized. Olivine, plagioclase, and orthopyroxene show the same sequence of shock effects in both types of experiments: (1) undulatory extinction, (2) planar fractures and planar deformation features, (3) mosaicism, and (4) phase transformations into glass or melting. Preheating decreases the minimum pressure required for shock effects. The present results provide a method to estimate both peak-shock pressure and preshock temperatures for naturally shocked chondrites. Shock effects in olivine and plagioclase are most useful for estimating shock pressures, whereas the preshock temperature can be derived from shock effects in troilite.

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