Temperature constraints by Raman spectroscopy of organic matter in volatile-rich clasts and carbonaceous chondrites

摘要: Abstract An important question regarding the formation of solar system is how planetary bodies developed from dust and ice into planets bodies. A particularly interesting topic thermal evolution carbonaceous chondrites volatile-rich clasts that could have originated CM- CI-like parent Two types these clasts, which are a particular type dark can be found. These mineralogically very similar to CM CI occasionally found in achondritic meteorites. Mineral assemblages suggest both as well experienced low peak temperatures. However, mineral only offer large estimated temperature ranges describe history chondrites, has not been previously described. In this study, gain better understanding we temperatures 30 (16 CI-, 14 CM-like) 10 different host meteorites (4 polymict ureilites, 5 eucrites 1 howardite) by Raman carbon thermometry. automated method was order over 4000 collected spectra using four pseudovoigt functions. The full width half maximum (FWHM) D1-band then used calculate Results were compared data 8 well-studied (including chondrites) evaluate suggestion composed material equivalent chondrites. Our results show range between 30–110 °C with an average about 65 ± 25 °C; CM-like 50 110 °C 70 ± 25 °C. Six studied (CM, CI, CR or C2ungr) also plot same low-temperature 50 °C 75 °C thus considered formed under conditions clasts. This agreement previous suggestions, based on their compositions materials. for determined study considerably reduce estimates proposed methods. By highlighting ability our methodology way, shows thermometry good analytical technique obtaining information small delicate samples.