[SIT18-P06] Study of differentiation process between metal and silicate induced from shock impact events
Keywords:Core formation, melt, compaction, pressure decay, porosity
In order to simulate shock wave propagation at impact event, the laser-generated shock wave was propagated into the sample. The pressure was 220-510 GPa (impact velocity of 10-17 km/s) on the titanium plate surface. The sample was the mixture of olivine powder and iron sulfide (FeS) powder. The porosity was about 30%. The mixing ratio of the sample was 6.6-10.3 vol.% of FeS. The cross section of the recovered sample was observed by scanning electron microscope (SEM) to measure the porosity of the sample, the aspect ratio of FeS particles, the number of FeS particles and the size distribution of FeS particles. We analyzed the composition of the molten segment in the recovered sample using an energy dispersive spectrometer (EDS) of the SEM.
It was found from the change of the aspect ratio of the FeS particles that the shock wave propagated through the sample with attenuating the pressure. There was a compression history in the shock wave propagation direction from the size distribution of the FeS particles and it was found that the number of flattened FeS particles increased around the sample surface from the volume fraction of the FeS particles.