Spectroscopy and Mineralogy of a New Meteorite Kamargaon (L6) Chondrite

Saikia, Basanta; Parthasarathy, G.; Borah, Rashmi R.; Satyanarayanan, M.; Borthakur, R.; Chetia, P.

doi:10.16943/ptinsa/2017/49124

Cited by 5 publications

(9 citation statements)

References 17 publications

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“…Full width at half maximum (FWHM) value determine for olivine Raman line at ~820cm −1 (v1) is ~17cm −1 and this value is identical to that of strongly shock stage. 1 The SiO 4 stretching vibrational modes of the peaks 821cm -1 and 852cm -1 shifted to the higher lower wavenumber region suggests that there is no coordination change of Si. Raman spectra of pyroxene characterized 25 by asymmetric peaks near 1000 cm −1 , asymmetric single or double peak at ~670cm -1 , and four peaks in the range 200-400cm -1 .…”

Section: Resultsmentioning

confidence: 99%

“…The peaks 821, 853 and 957cm -1 in Kamargaon spectra are assigned to the A g symmetry and peak at 922cm -1 to B 3g symmetry of forsterite mineral. 1,14 Figure 2 Raman spectra of some minerals recorded on the Kamargaon meteorite; a) mixture of minerals (pyroxene + olivine + plagioclase); b) pyroxene. The Raman spectra of olivine observed in different points of Kamargaon meteorite reveal homogeneity in chemical compositions (Figure 3).…”

Section: Resultsmentioning

confidence: 99%

“…The Kamargaon chondrite ( Figure 1) is a single fall (Kamargaon: 26°39ˊ01 ̋ N and 93° 46ˊ 02 ̋ E), on 13th November, 2015; its total known weight 12.095kg. [1][2][3] Earlier studies focused on the compositional analyses of the meteorite and assigned Kamargaon as an L6 ordinary chondrite. [1][2][3] A cosmic ray exposure age of Kamargaon is 7 Ma.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] Earlier studies focused on the compositional analyses of the meteorite and assigned Kamargaon as an L6 ordinary chondrite. [1][2][3] A cosmic ray exposure age of Kamargaon is 7 Ma. 2 Presence of irregular fractures of olivine and pyroxene grains observed previous authors 2 and entails the stage of shock metamorphism of Kamargaon is S3.…”

Section: Introductionmentioning

confidence: 99%

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The Raman spectroscopic technique has been utilized to determine the silicate composition and structure of Kamargaon meteorite (an ordinary chondrite L6 type; Kamargaon: 26°39ˊ01 ̋ N and 93° 46ˊ 02 ̋ E, India). The micro-Raman spectra in the range of 100-2000cm−1 revealed principal characteristic bands of the major minerals: olivine, pyroxene and plagioclase. Fourier transformed infrared technique is used as complementary to the Laser Raman spectroscopic method. The presence of some mineral phases such as kamacite and taenite as well as troilite and chromite were determined by X-ray diffraction method. The present study demonstrates the usefulness of Laser-Raman spectroscopic method in identifying high pressure mineral phases which are present in the shocked meteorite.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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“…2) reveals numerous absorption bands in 400-1400 cm -1 indicating the presence of silicates. The observed band at 508 cm -1 can be interpreted as Si-O and Mg-O vibration modes in enstatite (MgSiO 3 ) with slight shifts in the matrix [36,37]. Generally, below 500 cm −1 (e.g.…”

Section: Figure1mentioning

confidence: 98%

Raman and Infrared Spectroscopic Tentative Identification of Organic Traces in Sadiya (LL5) Ordinary Chondrite

Saikia¹,

Parthasarathy²,

Borah³

2018

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We report here for the first time the possible presence of organic compounds in Sadiya (LL5) ordinary chondrite using micro-Raman and infrared spectroscopic technique. The micro-Raman spectrum exhibits the diamond and graphite peaks correspondingly at 1331 cm-1 , 1349 cm-1 and 1588-1618 cm-1. The full wave at half maximum value of about 18 cm-1 for Sadiya indicating the nature of disordered phase involved shock metamorphism in the meteorite samples. The diamond and graphite peaks intensity ratio (~0.53) indicates the disordered nature of graphite. The infrared spectrum in the range 2700-3000 cm-1 indicates the presence of CH 3 asymmetric stretching, and CH 2 symmetric and asymmetric stretching modes due to aliphatic hydrocarbons. This study has strong implications in understanding of the organic compounds in extra-terrestrial materials.

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Petrography, mineral chemistry, metamorphism and Raman spectroscopic studies of Mahadevpur fall meteorite, India

et al. 2023

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The Mahadevpur (27°39′48″ N, 95°51′32″ E; Arunachal Pradesh, India) meteorite is a fall‐type, coarse‐grained rock consisting of a heterogeneous mixture of chondrules of varying types occurring in a matrix comprising mostly chondrule fragments. It was earlier classified as poorly shocked (S1, unshocked) ordinary chondrite (H4/5). The minerals observed in the Mahadevpur meteorite include olivine, orthopyroxene, clinopyroxene, albitic‐plagioclase, Fe‐Ni alloy and troilite with minor amounts of chromite and phosphate. Olivine and orthopyroxene are almost equilibrated. The textures and compositional features of minerals and chondrule margins indicate a limited degree of recrystallization. The equilibration temperature (700–800°C) for the Mahadevpur chondrite is consistent with the computed temperature (752–902°C) derived from the coexisting orthopyroxene‐clinopyroxene pairs. In the light of new evidences observed during the present study, such as olivine exhibiting undulose extinction and planar to sub‐planar fractures, olivine and orthopyroxene showing strong mosaicism, the shock‐melted plagioclase glasses, the presence of high‐pressure mineral phases and silicate darkening, the earlier proposed shock stage pronouncement has been modified to S4–S5 with supporting petrographic, sub‐microscopic and Raman spectroscopic data. This is the first comprehensive account of the Mahadevpur chondrite with an upgraded shock stage classification.

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Spectroscopy and Mineralogy of a New Meteorite Kamargaon (L6) Chondrite

Cited by 5 publications

References 17 publications

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Raman and Infrared Spectroscopic Tentative Identification of Organic Traces in Sadiya (LL5) Ordinary Chondrite

Petrography, mineral chemistry, metamorphism and Raman spectroscopic studies of Mahadevpur fall meteorite, India

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