Shock effects of CK chondrites inferred from high-temperature shock experiments on Allende

Details Shock effects of CK chondrites inferred from high-temperature shock experiments on Allende Shock effects of CK chondrites inferred from high-temperature shock experiments on Allende

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29r.509n&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 509-510

Computer Science

Allende Meteorite, Pressure Effects, Protoplanets, Shock Heating, Temperature Effects, Chondrule, Fusion (Melting), Melts (Crystal Growth), Metamorphism (Geology)

Scientific paper

Carbonaceous chondrites commonly show a variety of shock features that probably resulted from impacts on/between planetesimals in the early solar system. It is known that shock pressures generate two major effects: mechanical compression and postshock heating. The latter effect is particularly enhanced if the preshock temperature is high, and thus shock effects at high temperature are considered to be quite different from those at low temperature. We discuss conditions for shock metamorphism experienced by CK chondrites by comparing shock features of CK chondrites (Yamato 693 and Yamato 82104) with experimentally reproduced shock features of Allende. High-temperature shock experiments on the Allende CV chondrite were performed with experimental conditions (equilibrated shock pressures and preheated temperatures). Important features produced by the high-temperature shock experiments are blackening of silicate grains due to intrusion of Fe-S or Fe-Ni-S melt into fine fractures of the grains and segregation of Fe-S melt in areas approximately 400 micron in the matrix. Yamato 693 and Yamato 82104 show nearly the same degree of shock metamorphism. Olivine in both chondrules and matrix exhibit moderate to strong undulatory extinction and planar fractures. Extensive blackening occurs throughout the matrix and on the margins of chondrules. Shock features in the CK chondrites we studied show that they have experienced shock pressures not greater than that for the S3 level. The results of our shock experiments indicate that the blackening occurs at pressures of S3 level only when the sample was preheated to temperature higher than 300 C. If the CK parent bodies had been heated to such high temperatures, shock pressures of S3 level or even S2 may have been enough for generating the blackening and the shock-induced melt.

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