Shock recovery experiments for simulating short duration parent body heating

Abstract : Here we report on shock recovery experiments (5-50 GPa) conducted on two chondrites, Murchison (CM/2.6) and EET 90628 (LL/3.0), and on a tholin sample. We show that those shocks modify the chemical and D/H compositions of Insoluble Organic Matter, as well as its sp2 structure. Comparison with heated C2 chondrites reveal several similarities, but differences as well that question further the actual process that happened on the parent body. Experiments on the tholin sample show that carbonization happens as soon as 5 GPa, but the fast decrease of the D/H composition upon increasing pressure makes it unlikely Ultra Carbonaceous Antarctic Micro-Meteorites were formed through this process.