Features of Degassing of the Carbonaceous Chondrite Dar al Gani 190 (CO3) in the Temperature Range 200–800°C

The degassing of material from the carbonaceous chondrite Dar al Gani (DaG) 190 (type CO3) was studied using a specially designed experimental setup. The results of experimental investigations on heating and isothermal holding (pyrolysis) of meteorite samples are presented, with the composition of released gases determined by gas chromatography. Raman spectra and IR spectra were obtained for both the primary material of DaG 190 (CO3 type) and after annealing at three temperatures: 200, 500, and 800°C. Based on these data, the thermal transformation process of the asteroid material—the parent body of the meteorite—was traced. A comparison was made with the degassing results of another carbonaceous chondrite, Allende (type CV3). Cosmochemical applications to the accretion processes of terrestrial planets are discussed, as well as the role of carbonaceous chondrites as sources of water, gases, and volatile compounds for the Moon and early Earth.