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 composition was estimated to be 75% by using Raman and IR correlation data. Possible high impact shock pressure for Bursa meteorite was found to be at least 64.9 GPa. Besides, based on the olivine doublet (820 and 852 cm) and Full Width at Half Maximum data (~20 and ~60 cm, respectively) for maskelynite (509 and 580 cm) 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.