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Nanodiamonds and silicate minerals in ordinary chondrites as determined by micro‐Raman spectroscopy
Author(s) -
Saikia Bhaskar J.,
Parthasarathy Gopalakrishnarao,
Borah Rashmi R.
Publication year - 2017
Publication title -
meteoritics and planetary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.09
H-Index - 100
eISSN - 1945-5100
pISSN - 1086-9379
DOI - 10.1111/maps.12850
Subject(s) - meteorite , raman spectroscopy , shock metamorphism , chondrite , silicate , plagioclase , mineral , full width at half maximum , ordinary chondrite , olivine , analytical chemistry (journal) , graphite , geology , mineralogy , materials science , chemistry , astrobiology , quartz , optics , physics , metallurgy , paleontology , organic chemistry , optoelectronics , chromatography
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.