Chemical, isotopic and amino acid composition of Mukundpura CM2.0 (CM1) chondrite: Evidence of parent body aqueous alteration

Rudraswami, N. G.; Naik, Arun Kumar; Tripathi, R. P.; Bhandari, N.; Karapurkar, Supriya G.; Prasad, M.M.; Babu, E. V. S. S. K.; Sarathi, U.V.R. Vijaya

doi:10.1016/j.gsf.2018.02.001

Cited by 24 publications

(37 citation statements)

References 34 publications

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“…The magnetite peak was also observed in this meteorite by Rudraswami et al. (), but the large variation in the intensity of this peak in different samples indicates that this component is not uniformly distributed within the meteorite and is a minor (≤~2%) phase.…”

Section: Resultssupporting

confidence: 62%

“…The results are in agreement with earlier reports , showing the presence of higher volume fraction of Fe-cronstedtite phase, besides Mg serpentine, olivine, and calcite. The magnetite peak was also observed in this meteorite by Rudraswami et al (2018), but the large variation in the intensity of this peak in different samples indicates that this component is not uniformly distributed within the meteorite and is a minor (≤~2%) phase.…”

Section: Structural and Microstructural Studiesmentioning

confidence: 82%

“…Furthermore, Rudraswami et al. () and Ray and Shukla (), based on chemical and isotopic studies, showed that Mukundpura is dominated by phyllosilicates, with rare presence of olivine, calcite, and magnetite and classified it as a primitive CM2.0 chondrite. While Ray and Shukla () proposed that Mukundpura is similar to both Murchison and Paris (CM2) meteorite (The Meteoritical Bulletin ), Rudraswami et al.…”

Section: Introductionmentioning

confidence: 99%

“…While Ray and Shukla () proposed that Mukundpura is similar to both Murchison and Paris (CM2) meteorite (The Meteoritical Bulletin ), Rudraswami et al. () found it to have undergone more severe aqueous alteration similar to cold Bokkeveld CM2.…”

Section: Introductionmentioning

confidence: 99%

“…Based on mineral, elemental, thermal, and room temperature M€ ossbauer spectroscopic measurements, the meteorite was classified as CM type of carbonaceous chondrite by Tripathi et al (2018). Furthermore, Rudraswami et al (2018) and Ray and Shukla (2018), based on chemical and isotopic studies, showed that Mukundpura is dominated by phyllosilicates, with rare presence of olivine, calcite, and magnetite and classified it as a primitive CM2.0 chondrite. While Ray and Shukla (2018) proposed that Mukundpura is similar to both Murchison and Paris (CM2) meteorite (The Meteoritical Bulletin 2019), Rudraswami et al (2018) found it to have undergone more severe aqueous alteration similar to cold Bokkeveld CM2.…”

Section: Introductionmentioning

confidence: 99%

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Glassy magnetic cronstedtite signatures in Mukundpura CM2 chondrite based on magnetic and Mössbauer studies

Dixit

Tripathi

Bhandari³

2019

Meteorit & Planetary Scien

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We have studied the Mukundpura CM2 meteorite for magnetic properties as a function of temperature and magnetic field, as well as its Mössbauer spectrum, at room and low temperatures (up to 5 K). We find that the high temperature paramagnetic phase is followed by two magnetic transitions: a weak transition near 125 K and a strong transition at 8 K. The weak (125 K) magnetic phase can be attributed to complex Fe2+–Fe3+ constituents present in the meteorite. The absence of the characteristic sextet corresponding to magnetite in Mossbauer spectrum indicates that this magnetic phase is not magnetite, which, if present, must be in insignificant amount. The 8 K magnetic ordering is superimposed with weak ferromagnetic ordering, showing spin‐glass transition. The Mössbauer spectrum taken at 5 K substantiates the observed spin‐glassy nature, as very large hyperfine field ~32 T is recorded, causing localized subordering leading to spin‐glass behavior. The Mössbauer spectra also confirm that iron is mainly present in serpentine‐group minerals, both in ferrous and ferric states. The complete serpentinization of basic silicates indicates aggressive hydrous alteration. These results show that the observed spin‐glass signature is a characteristic feature of the cronstedtite phase in CM meteorites. This feature is unique to carbonaceous CM chondrites and could be used for nondestructive, quick, and independent classification of this rare class of meteorites. Furthermore, the absence of olivine and the presence of cronstedtite in Mossbauer spectra show that the degree of aqueous alteration observed is the most severe in Mukundpura CM2 meteorite, as compared to many other CM2 meteorites. The degree of aqueous alteration in CM2 carbonaceous chondrites increases in the sequence: Paris, Murchison, Murray, Mighei, Nogoya, Cold Bokkeveld, and Mukundpura.

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Section: Resultssupporting

confidence: 62%

Section: Structural and Microstructural Studiesmentioning

confidence: 82%