SHOCK COMPRESSION CURVE OF JILIN CHONDRITE AND ITS SIGNIFICANCES

Shock compression curve of Jilin chcmdrite with H-chondrite representives is measured by the electrical pin technique on the dynamic high pressure device equipped with a two-stage light gas gun. The curve shows that under>70GPa shock pressure Jilin chondrite transforms into the high pressure phase which zero-pressure density is 4.425 g/cm³, and the zero-pressure density of silicates is 4.068 g/cm³. This study results of shock compression pro-perities of H-cho’ndrites are consistent with the planetesimal accumulation model of the Earth formation (1ABiron meteorite + Hgroup chondrite). In addition, minimum impact velocities for important shock features in main types of meteorites are calculated by the impedance-matching principle in term of shock compression curves of meteorites or analogue materials, and then the dynamic condition on formations of shock features in meteorites and the impact environment of their parent bodies are discussed.