Cathodoluminescence Characterization of Maskelynite and Alkali Feldspar in Shergottite (Dhofar 019)

Journal Article · Mon Aug 17 00:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3222879· OSTI ID:21344499

Kayama, M; Nakazato, T; Nishido, H ^[1]; Ninagawa, K ^[2]; Gucsik, A ^[3]

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1. Research Institute of Natural Sciences, Okayama University of Science, 1-1 Ridai-cho, Kita-ku, Okayama, 700-0005 (Japan)
2. Department of Applied Physics, Okayama University of Science 1-1 Ridai-cho, Kita-ku, Okayama, 700-0005 (Japan)
3. Max Planck Institute for Chemistry, Department of Geochemistry, Joh.-J. Becherweg 27, D-55128 Mainz (Germany)

Dhofar 019 is classified as an olivine-bearing basaltic shergottite and consists of subhedral grains of pyroxene, olivine, feldspar mostly converted to maskelynite and minor alkali feldspar. The CL spectrum of its maskelynite exhibits an emission band at around 380 nm. Similar UV-blue emission has been observed in the plagioclase experimentally shocked at 30 and 40 GPa, but not in terrestrial plagioclase. This UV-blue emission is a notable characteristic of maskelynite. CL spectrum of alkali feldspar in Dhofar 019 has an emission bands at around 420 nm with no red emission. Terrestrial alkali feldspar actually consists of blue and red emission at 420 and 710 nm assigned to Al-O{sup -}-Al and Fe{sup 3+} centers, respectively. Maskelynite shows weak and broad Raman spectral peaks at around 500 and 580 cm{sup -1}. The Raman spectrum of alkali feldspar has a weak peak at 520 cm{sup -1}, whereas terrestrial counterpart shows the emission bands at 280, 400, 470, 520 and 1120 cm{sup -1}. Shock pressure on this meteorite transformed plagioclase and alkali feldspar into maskelynite and almost glass phase, respectively. It eliminates their luminescence centers, responsible for disappearance of yellow and/or red emission in CL of maskelynite and alkali feldspar. The absence of the red emission band in alkali feldspar can also be due to the lack of Fe{sup 3+} in the feldspar as it was reported for some lunar feldspars.

• OSTI ID: 21344499
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1163; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANORTHOSITES
CATHODOLUMINESCENCE
CHARGED PARTICLES
COMPARATIVE EVALUATIONS
ELECTRON MICROSCOPY
EMISSION
EMISSION SPECTRA
EMISSION SPECTROSCOPY
EVALUATION
FELDSPARS
GABBROS
IGNEOUS ROCKS
IONS
IRON IONS
LUMINESCENCE
METEORITES
MICROSCOPY
MINERALS
OLIVINE
PHOTON EMISSION
PLUTONIC ROCKS
PRESSURE RANGE
PRESSURE RANGE GIGA PA
RAMAN SPECTRA
ROCKS
SCANNING ELECTRON MICROSCOPY
SILICATE MINERALS
SPECTRA
SPECTROSCOPY