Nanodiamonds and silicate minerals in ordinary chondrites as determined by micro-Raman spectroscopy

1Bhaskar J. Saikia,2Gopalakrishnarao Parthasarathy,3Rashmi R. Borah
Meteoritics&Planetary Science (in Press) Link to Article [DOI: 10.1111/maps.12850]
1Department of Physics, Anandaram Dhekial Phookan College, Nagaon, India
2CSIR-National Geophysical Research Institute, Hyderabad, India
3Department of Physics, Nowgong College, Nagaon, India
Published by arrangement with John Wiley&Sons

We present here the Raman spectroscopic study of silicate and carbonaceous minerals in three ordinary chondrites with the aim to improve our understanding the impact process including the peak metamorphic pressures present in carbon-bearing ordinary chondites. The characteristic Raman vibrational peaks of olivines, pyroxenes, and plagioclase have been determined on three ordinary chondrites from India, Dergaon (H5), Mahadevpur (H4/5), and Kamargaon (L6). The Raman spectra of these meteorite samples show the presence of nanodiamonds at 1334–1345 cm−1 and 1591–1619 cm−1. The full-width at half maximum (FWHM) of Raman peaks for Mahadevpur and Dergaon reflect the nature of shock metamorphism in these meteorites. The frequency shift in Raman spectra might be because of shock effects during the formation of the diamond/graphite grains.

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