Cathodoluminescence microscopy and spectroscopy of forsterite from Kaba meteorite: An application to the study of hydrothermal alteration of parent body |
| |
| Authors: | Arnold Gucsik Taro Endo Hirotsugu Nishido Kiyotaka Ninagawa Masahiro Kayama Szaniszló Bérczi Szabolcs Nagy Péter Ábrahám Yuki Kimura Hitoshi Miura Ildikó Gyollai Irakli Simonia Péter Rózsa József Posta Dániel Apai Krisztián Mihályi Mihály Nagy Ulrich Ott |
| |
| Institution: | 1. Department of Geology, University of Johannesburg, , Johannesburg, South Africa;2. Konkoly Thege Miklos Astronomical Institute, Research Centre for Astronomy and Earth Sciences, , Budapest, H‐1121 Hungary;3. Department of Biosphere‐Geosphere System Science, Okayama University of Science, , Okayama, 700‐0005 Japan;4. Department of Applied Physics, Okayama University of Science, , Okayama, 700‐0005 Japan;5. Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, , Higashi‐Hiroshima, Hiroshima, 739‐8526 Japan;6. Institute of Physics, Department of Material Physics, E?tv?s University, , Budapest, H‐1117 Hungary;7. Department of Mineralogy, Petrology and Geochemistry, University of Szeged, , Egyetem utca 2, Szeged, H‐6722 Hungary;8. Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University, , Sendai, 980‐8578 Japan;9. Department of Lithospheric Research, Center for Earth Sciences, University of Vienna, , Vienna, A‐1090 Austria;10. School of Graduate Studies of Ilia State University, , Tbilisi, Georgia;11. University of Debrecen, , Debrecen, H‐4032 Hungary;12. Lunar and Planetary Laboratory, Department of Planetary Sciences, The Arizona University, , Tucson, Arizona, 85721–0092 USA;13. Reformed College of Debrecen, , Debrecen, H‐4026 Hungary;14. Savaria University Center, University of West Hungary, , Szombathely, H‐9700 Hungary |
| |
| Abstract: | Highly forsteritic olivine (Fo: 99.2–99.7) in the Kaba meteorite emits bright cathodoluminescence (CL). CL spectra of red luminescent forsterite grains have two broad emission bands at approximately 630 nm (impurity center of divalent Mn ions) in the red region and above 700 nm (trivalent Cr ions) in the red–IR region. The cores of the grains show CL blue luminescence giving a characteristic broad band emission at 400 nm, also associated with minor red emissions related to Mn and Cr ions. CL color variation of Kaba forsterite is attributed to structural defects. Electron probe microanalyzer (EPMA) analysis shows concentrations of Ca, Al, and Ti in the center of the forsterite grain. The migration of diffusible ions of Mn, Cr, and Fe to the rim of the Kaba meteoritic forsterite was controlled by the hydrothermal alteration at relatively low temperature (estimated at about 250 °C), while Ca and Al ions might still lie in the core. A very unusual phase of FeO (wüstite) was also observed, which may be a terrestrial alteration product of FeNi‐metal. |
| |
| Keywords: | |
|
|
