Crystallization temperature determination of Itokawa particles by plagioclase thermometry with X‐ray diffraction data obtained by a high‐resolution synchrotron Gandolfi camera |
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| Authors: | Masahiko Tanaka Tomoki Nakamura Takaaki Noguchi Aiko Nakato Hatsumi Ishida Toru Yada Kei Shirai Akio Fujimura Yukihiro Ishibashi Masanao Abe Tatsuaki Okada Munetaka Ueno Toshifumi Mukai |
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| Institution: | 1. Synchrotron X‐ray Station at SPring‐8, National Institute for Materials Science (NIMS), , Sayo, Hyogo, 679‐5198 Japan;2. Department of the Earth and Planetary Material Science, Tohoku University, , Sendai, Miyagi, 980‐8578 Japan;3. Department of Materials and Biological Sciences, Ibaraki University, , Mito, Ibaraki, 310‐8512 Japan;4. JAXA‐ISAS, , Sagamihara, Kanagawa, 229‐8510 Japan |
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| Abstract: | The crystallization temperatures of Itokawa surface particles recovered by the space probe Hayabusa were estimated by a plagioclase geothermometer using sodic plagioclase triclinicity. The Δ131‐index required for the thermometer, which is the difference in X‐ray diffraction peak positions between the 131 and 1 1 reflections of plagioclase, was obtained by a high‐resolution synchrotron Gandolfi camera developed for the third generation synchrotron radiation beamline, BL15XU at SPring‐8. Crystallization temperatures were successfully determined from the Δ131‐indices for four particles. The observed plagioclase crystallization temperatures were in a range from 655 to 660 °C. The temperatures indicate crystallization temperatures of plagioclases in the process of prograde metamorphism before the peak metamorphic stage. |
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