Shock-induced olivine-ringwoodite and plagioclase-maskelynite transformations in Bursa L6 chondrite: A Raman and ATR-FTIR spectroscopic study

Olivine-ringwoodite and plagioclase-maskelynite transformation mechanisms in the Bursa L6 chondrite were determined by Raman and Attenuated Total Reflectance (ATR)-Fourier Transform Infrared (FTIR) spectroscopic techniques. Forsterite compositionwas estimated to be 75% by using Raman and IR correlation data. Possible high impact shock pressure for Bursa meteoritewas found to be at least 64.9 GPa. Besides, based on the olivine doublet (820 and 852 cm(-1)) and Full Width at Half Maximum data (similar to 20 and similar to 60 cm(-1), respectively) for maskelynite (509 and 580 cm(-1)) observed in the Raman spectrum, we assigned the shock stage of this meteorite as at least S5, for the first time. Moreover, previously reported hypervelocity impact experiments also supported this assignment. (c) 2020 Elsevier B.V. All rights reserved.