Kinetics in thermal evolution of Raman spectra of chondritic organic matter to evaluate thermal history of their parent bodies

1Kento Kiryu,1Yoko Kebukawa,2Motoko Igisu,2Takazo Shibuya,3Michael E. Zolensky,1Kensei Kobayashi
Meteoritics & Planetary Science (in Press) Link to Article [https://doi.org/10.1111/maps.13548]
1Graduate School of Engineering Science, Yokohama National University, 79‐5 Tokiwadai, Hodogaya‐ku, Yokohama, 240‐8501 Japan
2Super‐cutting‐edge Grand and Advanced Research (Sugar) Program, Institute for Extra‐cutting‐edge Science and Technology Avant‐garde Research (X‐star), Japan Agency for Marine‐Earth Science and Technology (JAMSTEC), 2‐15 Natsushima‐cho, Yokosuka, 237‐0061 Japan
3Astromaterials Research and Exploration Science, NASA Johnson Space Center, 2101 NASA Parkway, Houston, Texas, 77058 USA
Published by arrangement with John Wiley & Sons

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 (ΓD) 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 ΓD 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.

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