R5: Extraterrestrial materials

[R5P-02] Metamorphic temperature analysis of H chondrites: An attempt using revised Lindsley's pyroxene thermometer

*Ryo Uehara¹, Yoshihiro Kuwahara², Kazuhiko Shimada⁴, Yoshihiro Nakamuta³, Seiichiro Uehara⁴, Taturo Adachi⁵ (1. Kyushu Uni. ISGS., 2. Kyushu Uni. SCS., 3. Kyushu Uni. Mus, 4. Kyushu Uni. Sci, 5. Kyushu Uni. Arch)

Keywords:H chondrite, Lindsley pyroxene thermometer, Kosmoclor, Peak temperature, Onion-shell model

In order to accurately estimate the peak temperature of chondrites, Nakamuta et al. (2017) proposed the revised Lindsley’s pyroxene thermometer in which the kosmochlor component is newly added in the caluculation. Using the revised thermometer, they showed that the difference in temperature between Cpx and Opx in LL chondrites was less than 20°C. We have attempted to estimate the metamorphic temperatures of H chondrites (type 4 to 7) using the revised Lindsley’s pyroxene thermometer. Here we will report the results.