In order to establish kinetic expressions for Raman spectroscopic parameters of organic matter in chondritic meteorites with heating, a series of heating experiments (at 600–900 °C for 3–48 h) of the Murchison (CM2) meteorite was conducted. For comparison, several carbonaceous chondrites with various metamorphic degrees—Allende (CV3.2), Moss (CO3.6), Yamato (Y‐) 793321 (heated CM2), and Tagish Lake (ungrouped C2)—were also analyzed by the Raman spectrometer. Changes in the full width at half maximum of the D1 band (Γ_D) of heated Murchison correlated well with temperature and time, and showed similar trends of chondrites with various metamorphic degrees. We obtained the kinetic expressions for the changes in Γ_D by heating to estimate the time–temperature history of thermally metamorphosed type 3 chondrites and heated CM chondrites. Our results may also be useful for asteroids which are the targets of Hayabusa2 and OSIRIS‐REx missions.

中文翻译：

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软骨状有机质拉曼光谱热演化动力学以评估其母体的热历史

为了建立伴有加热的球状陨石中有机物的拉曼光谱参数的动力学表达式，进行了一系列默奇森（CM2）陨石的加热实验（在600–900°C下进行了3–48 h）。为了进行比较，拉曼还分析了几种变质程度不同的碳质球粒陨石-阿连德（CV3.2），苔藓（CO3.6），大和（Y‐）793321（加热的CM2）和塔吉什湖（未分组的C2）。光谱仪。在D1频带（Γ的半值在全宽中的变化_d加热默奇森的）随温度和时间相关性良好，并显示出与各种变质程度陨石的相似的趋势。我们获得的动能表达式为Γ的变化_d通过加热来估计热变质的3型球粒陨石和加热的CM球粒陨石的时间-温度历史。我们的结果对于作为Hayabusa2和OSIRIS‐REx任务目标的小行星也可能有用。