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Crystallization temperature determination of Itokawa particles by plagioclase thermometry with X‐ray diffraction data obtained by a high‐resolution synchrotron Gandolfi camera
Author(s) -
Tanaka Masahiko,
Nakamura Tomoki,
Noguchi Takaaki,
Nakato Aiko,
Ishida Hatsumi,
Yada Toru,
Shirai Kei,
Fujimura Akio,
Ishibashi Yukihiro,
Abe Masanao,
Okada Tatsuaki,
Ueno Munetaka,
Mukai Toshifumi
Publication year - 2014
Publication title -
meteoritics and planetary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.09
H-Index - 100
eISSN - 1945-5100
pISSN - 1086-9379
DOI - 10.1111/maps.12215
Subject(s) - plagioclase , crystallization , synchrotron radiation , materials science , beamline , synchrotron , resolution (logic) , mineralogy , crystallography , geology , optics , chemistry , physics , composite material , quartz , thermodynamics , computer science , beam (structure) , artificial intelligence
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 3 ¯ 1 reflections of plagioclase, was obtained by a high‐resolution synchrotron Gandolfi camera developed for the third generation synchrotron radiation beamline, BL 15 XU at SP ring‐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.