Mineralogy and spectroscopy (visible near infrared and Fourier Transform Infrared) of Mukundpura CM2: Implications for asteroidal aqueous alteration

Baliyan, S.; Moitra, H.; Sarkar, Subham; Ray, Dwijesh; Panda, D.; Shukla, A. D.; Bhattacharya, S.; Gupta, Saibal

doi:10.1016/j.chemer.2020.125729

Cited by 7 publications

(3 citation statements)

References 29 publications

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“…Baliyan et al. (2021) also reported this value ∼90%; Matthew et al. (2019) also reported ∼0.6% of magnetite.…”

Section: Resultsmentioning

confidence: 88%

“…In another study, Baliyan et al. (2021) have independently reported mineralogy study, visible, near‐infrared, and FTIR investigation of Mukundpura and found it consistent with CM2. According to their studies, the surface mineralogy of Mukundpura resembles the C‐type asteroids recently probed by OSIRIS‐REx and Hayabusa2 missions.…”

Section: Introductionmentioning

confidence: 87%

“…Matthew et al (2019) reported the modal mineralogy for Mukundpura meteorite. Assuming it is correct, then PSF (phyllosilicate fraction) in Mukundpura is $ 88% Baliyan et al (2021). also reported this value $ 90%;Matthew et al (2019) also reported $ 0.6% of magnetite.…”

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confidence: 95%

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Characterizing the degree of aqueous alteration in a fresh sample of Mukundpura CM chondrite fall using ATR‐FTIR and TGA

Dixit

Tripathi²,

Kumar

et al. 2022

Meteorit & Planetary Scien

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Fourier transform infrared (FTIR) measurements on immediately collected Mukundpura show the typical feature for phyllosilicates around 10 lm, corresponding to Si-O stretching mode in silicate, and its broadness signifies the amorphous or poorly crystalline silicates. The absence of the 11.2 lm feature (a characteristic of anhydrous silicate olivine) and the weight loss observed in thermogravimetric analysis (TGA) imply aggressive aqueous alteration, which resulted in phyllosilicate formation at the expense of primary anhydrous silicates. It is consistent with M€ ossbauer spectra, showing the presence of both Fe 2+ and Fe 3+ in phyllosilicates, but no characteristic peak for olivine is observed, suggesting the major fraction of primary silicates are aggressively altered due to the presence of water on the parent body, and now major lithology must be highly altered. TGA measurements were carried on it (i) within 24 h and (ii) after 30 months of its fall. In both cases, the weight loss was $ 10% in the 400-770 °C temperature range, confirming the absence of any environmental impact on the water bound to the hydrated clay in Mukundpura samples. Appreciable weight loss in 400-770 °C indicated the presence of hydrated clay that corroborated FTIR measurements and ruled out any thermal event suffered by its postaqueous alteration, consistent with amorphous or poorly crystalline silicate phase observed in FTIR. When we couple the results of the present study and already reported results by our group on the same Mukundpura fragment, it is inferred that our sample has suffered a very high degree of aqueous alteration on the parent body. The fingerprint ratios, which are extensively used to correlate or assign petrological subgroup, are FeO/SiO 2 , hydrous silicate/anhydrous silicates, and MgO/FeO, which are either considered alone or in combination, and for Mukundpura, the values for these ratios are 1.05, 7.2, and $ 0.60, respectively. These values indicate that the major lithology of Mukundpura fresh fragment must be assigned as CM2.1.

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“…Baliyan et al. (2021) also reported this value ∼90%; Matthew et al. (2019) also reported ∼0.6% of magnetite.…”

Section: Resultsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 87%