High Shock Pressure Metamorphism Induced Transformations of Olivine and Feldspar in Natun Balijan L4 Chondrite: Evidence from Micro-Raman, Infrared Spectroscopy, X-ray Diffraction and Electron Microprobe Analysis

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Bhaskar J. Saikia, G. Parthasarathy, N. V. Chalapathi Rao, Rashmi R. Borah & Deepak Kumar

Journal of the Geological Society of India, Volume 98, pages 731–739
Published: 10 June 2022

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“For the first time, the presence of olivine-ringwoodite and plagioclase-maskelynite transformations is reported in Natun Balijan L4 chondrite determined by micro-Raman and infrared spectroscopic techniques with mineral phases characterised by electron microprobe analysis. Micro-Raman spectra reveal trace of ringwoodite, which is independently confirmed with the powder X-ray diffraction analysis. Full width at half maximum data of Raman spectrum reveals structural disordered olivine and pyroxene. The nature of infrared peaks at 639 and 724 cm−1 depicts the presence of maskelynite. Observed maskelynite Raman band at 509 and 581 cm−1 are used to estimate the shock stage of Natun Balijan L4 chondrite as at least S5. The impact metamorphism with a shock pressure of at least 40 GPa is estimated.”

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