Host: The Japanese Society for Planetary Sciences: Local Organizing Committee for 2006 Fall Meeting
Collisional heating is an important mechanism of the thermal metamorphism induced in the meteorite parent body and the impact energy is efficiently converted into thermal energy when the parent body has a large porosity. Therefore, we tried to measure the residual temperature caused by impact in order to clarify the thermal evolution of a highly porous body . At low-speed impact experiments (vi<100m/s), a porous silica with the porosity of 40% was collided on a granite block. At High-speed experiments (60-430m/s), an ice projectile impacted on a porous silica disk with the porosity of 60%. The impacted silica projectile and disk were observed by an infrared video camera to measure the residual temperature in it. As a result, the low velocity experiments reveled dT=0.13Vi0.84. The high velocity impacts reveled dT=0.65x10-2Vi0.96.
