Chronology of Parent Body Cooling скачать в хорошем качестве

Chronology of Parent Body Cooling

The cooling path of individual chondrites can be determined with a set of mineral thermometers that can also be dated. This means, a certain mineral forms at a certain temperature and time, and both can be determined. This is done for a set of minerals and for chondrites of various petrologic types. The slope of the resulting cooling path further represents the cooling rate of each chondrite. These cooling rates vary from a few Ma per 100 K for H4 chondrites up to ~10 Ma per 100 K for H6 chondrites. Hence, H6 chondrites cool slower than H4 chondrites. This is in accordance with the onion shell model for asteroids, in which H6 chondrites form in the center, where heat conductivity to the surface is slow, and therefore the cooling rate is slow, when compared to H4 chondrites, which form closer to the surface of an asteroid, where heat conductivity is faster.