TY - JOUR
T1 - Luminescence spectroscopical properties of plagioclase particles from the Hayabusa Sample Return Mission
T2 - An implication for study of space weathering processes in the asteroid Itokawa
AU - Gucsik, Arnold
AU - Nakamura, Tomoki
AU - Jäger, Cornelia
AU - Ninagawa, Kiyotaka
AU - Nishido, Hirotsugu
AU - Kayama, Masahiro
AU - Tsuchiyama, Akira
AU - Ott, Ulrich
AU - Kereszturi, Ákos
N1 - Funding Information:
The authors are thankful to JAXA (The Japan Aerospace Exploration Agency) for providing an access to the Itokawa particles from the Hayabusa Sample Return Mission and for providing financial support for the attendance of the 2nd Hayabusa Symposium (2014). A.G. was supported by the National Research Foundation (NRF) Free-standing Fellowship Program (Johannesburg, South Africa) and by a visiting scientist grant at the Max Planck Institute for Astronomy (Laboratory Astrophysics Group, Jena, Germany), as well as Fulbright Visiting Professorship at the University of Arizona, Tucson, USA. A.G. was also supported by the Short Term Scientific Mission (COST Action CM 1401). This work holds a copyright permission given by the Nova Science Publisher to the contribution as follows: Kereszturi A, Gucsik A, Nishido H, Ninagawa K, Kayama M (2014), Impacts on airless objects under microgravity and possible related structures in Itokawa asteroid sample. In: Horizons in World Physics, Reimer (Ed), Nova Science Publishers, 282:21-36. (ISBN: 978-1-63321-301-2). Authors are grateful for Prof. Timothy Jull (the University of Arizona, Tucson, USA) providing an English proof-reading of this manuscript. Authors are thankful for Prof. Jens Götze (University of Freiberg, Freiberg, Germany) for his helpful comments on this paper.
Publisher Copyright:
© MICROSCOPY SOCIETY OF AMERICA 2017.
PY - 2017/2
Y1 - 2017/2
N2 - We report a systematic spectroscopical investigation of three plagioclase particles (RB-QD04-0022, RA-QD02-0025-01, and RA-QD02-0025-02) returned by the Hayabusa spacecraft from the asteroid Itokawa, by means of scanning electron microscopy, cathodoluminescence microscopy/spectroscopy, and micro-Raman spectroscopy. The cathodoluminescence properties are used to evaluate the crystallization effects and the degree of space weathering processes, especially the shock-wave history of Itokawa. They provide new insights regarding spectral changes of asteroidal bodies due to space weathering processes. The cathodoluminescence spectra of the plagioclase particles from Itokawa show a defect-related broad band centered at around 450 nm, with a shoulder peak at 425 nm in the blue region, but there are no Mn- or Fe-related emission peaks. The absence of these crystal field-related activators indicates that the plagioclase was formed during thermal metamorphism at subsolidus temperature and extreme low oxygen fugacity. Luminescence characteristics of the selected samples do not show any signatures of the shock-induced microstructures or amorphization, indicating that these plagioclase samples suffered no (or low-shock pressure regime) shock metamorphism. Cathodoluminescence can play a key role as a powerful tool to determine mineralogy of fine-grained astromaterials.
AB - We report a systematic spectroscopical investigation of three plagioclase particles (RB-QD04-0022, RA-QD02-0025-01, and RA-QD02-0025-02) returned by the Hayabusa spacecraft from the asteroid Itokawa, by means of scanning electron microscopy, cathodoluminescence microscopy/spectroscopy, and micro-Raman spectroscopy. The cathodoluminescence properties are used to evaluate the crystallization effects and the degree of space weathering processes, especially the shock-wave history of Itokawa. They provide new insights regarding spectral changes of asteroidal bodies due to space weathering processes. The cathodoluminescence spectra of the plagioclase particles from Itokawa show a defect-related broad band centered at around 450 nm, with a shoulder peak at 425 nm in the blue region, but there are no Mn- or Fe-related emission peaks. The absence of these crystal field-related activators indicates that the plagioclase was formed during thermal metamorphism at subsolidus temperature and extreme low oxygen fugacity. Luminescence characteristics of the selected samples do not show any signatures of the shock-induced microstructures or amorphization, indicating that these plagioclase samples suffered no (or low-shock pressure regime) shock metamorphism. Cathodoluminescence can play a key role as a powerful tool to determine mineralogy of fine-grained astromaterials.
KW - Asteroid
KW - Cathodoluminescence
KW - Micro-Raman spectroscopy
KW - Mineralogy
KW - Space weathering
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U2 - 10.1017/S1431927617000046
DO - 10.1017/S1431927617000046
M3 - Article
C2 - 28228168
AN - SCOPUS:85034628034
SN - 1431-9276
VL - 23
SP - 179
EP - 186
JO - Microscopy and Microanalysis
JF - Microscopy and Microanalysis
IS - 1
ER -