Abstract
Organic matter alteration on carbonaceous chondrite parent body was simulated under micro FT-IR with a heating stage. Leonardite (IHSS standard humic acid) and synthetic saponite were used as the macromolecular organics and the matrix mineral. These powdered samples were dispersed by MilliQ water then dropped on an CaF2 plate and dried. They were heated in the heating stage at room temperature to 600C by 10C/min in air, Ar gas and H2+CO2 gas mixture. IR spectra were collected at every 20C under the micro FT-IR. Aliphatic C-H increased from room temperature to approximately 250C then decreased. Aromatic C-H increased from room temperature to around 400-450C then decreased. Aliphatic C-H decreased faster and Aromatic C-H increased faster in Air than in Ar or H2+CO2. The decrease in aliphatic C-H of leonardite and the increase in aromatic C-H were slower with the presence of saponite than those of leonardite only.
