Spatially-resolved mineral identification and depth profiling on chondrules from the primitive chondrite Elephant Moraine 14017 with confocal Raman spectroscopy
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- Spatially-resolved mineral identification and depth profiling on chondrules from the primitive chondrite Elephant Moraine 14017 with confocal Raman spectroscopy
- Other Titles
- 컨포컬 라만 분광기를 이용한 미분화운석 EET 14017내 콘드률의 고분해능 광물 연구
- Confocal Raman Spectroscopy; Depth Profiline; Mineral Identification; Primitive Meteorites
- Issue Date
- 박선영, Park, Changkun. 2019. "Spatially-resolved mineral identification and depth profiling on chondrules from the primitive chondrite Elephant Moraine 14017 with confocal Raman spectroscopy". SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 207(1): 46-53.
- Confocal Raman spectroscopy is effective in unveiling structures ofmineralswithout destruction fromsurface to certain depth. In this study, we introduce an application of confocal Raman spectroscopy on minerals in a primitive chondriticmeteorite. The experimental lateral resolution on silicateminerals in this study is ~1.0 μm. Raman spectrum of mesostasis in a named “Tear Drop” chondrule, a spherule object from a primitive chondrite, of Elephant Moraine 14017 (EET 14017) shows a broad feature indicating amorphous phase, which is a common characteristic of primitive chondrule mesostasis. Weak intensities of 825 and 858 cm？1 peaks were observed in the glassy mesostasis, probably originated from olivine below the surface. A plagioclase-rich chondrule (PRC-1) of EET 14017 was investigated with Raman spectroscopy, which contains two different occurrences of plagioclase: lath-shaped and interstitial grains. The strong intensity of 488 and 505 cm？1 (plagioclase) and weak intensity of 461 cm？1 band were observed on the lath-shaped plagioclase. The weak 461 cm？1 peak from the plagioclase is probably from the subsurface quartz. Raman spectrum of interstital plagioclase in PRC-1 shows 488 and 505 cm？1 bands and weak pyroxene bands. Depth profiling conducted on the interstitial plagioclase clearly shows that pyroxene exists below the surface. High-lateral resolution and well-resolved depth profiling with the confocal Raman spectroscopy allows us to identify tiny grains and investigate hidden phases underneath the surface without destruction of extraterrestrial materials.
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