제주도 현무암과 맨틀 포획암의 뫼스바우어 분광 특성 연구

초록

This study aims to compare the oxidation state and magnetic properties of iron ions in basaltic rocks and mantle xenoliths collected from the Gyoraeri area of Jeju island using X-ray diffraction (XRD), X-ray fluorescence (XRF), and Mössbauer spectroscopy. XRD results revealed that the basaltic rocks primarily consist of plagioclase, olivine, and orthopyroxene, while the mantle xenoliths are mainly composed of olivine, orthopyroxene, clinopyroxene, and small amount of spinel. Mössbauer spectra shows that the Fe3+/ΣFe ratio is significantly higher in basalt samples (0.17~0.19) than in mantle xenoliths (0.025~0.026), indicating that the xenoliths formed under more reducing conditions. This results highlights how iron oxidation states and magnetic properties vary with formation environment. The findings in present study support the interpretation that basaltic rocks originated in a more oxidizing crustal setting than the xenoliths. In contrast, the xenoliths reflect a deeper and more reducing environment in the upper mantle. This study applies Mössbauer spectroscopy to mantle xenoliths from Jeju Island, offering a distinctive analytical approach and valuable insights into the redox state and geochemical evolution of the region’s upper mantle.

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