Mineralogy and spectroscopy (VIS near infrared and micro-Raman) of chromite from Nidar ophiolite complex, SE Ladakh, India: Implications for future planetary exploration

Naveen,; Sarkar, Subham; Kumar, T. Nirmal; Ray, Dwijesh; Bhattacharya, S.; Shukla, A. D.; Moitra, H.; Dagar, A.; Chauhan, Prakash; Sen, Koushick; Das, Souvik

doi:10.1016/j.pss.2018.12.007

Cited by 10 publications

(3 citation statements)

References 21 publications

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“…Figure S2 shows the correlation (Cr 3+ + Fe 3+ )/(Cr 3+ + Fe 3+ + Al 3+ ) versus the A1g (v1) mode (Malézieux & Piriou, 1988) measured on the grains from this study to describe the Cr 3+ and Fe 3+ occupancy on the octahedral sites. The results show a strong agreement with literature data (Malézieux & Piriou, 1988; Naveen et al., 2019; Wang et al., 2004) and thus confirms the known trend.…”

Section: Resultssupporting

confidence: 92%

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Unusual sources of fossil micrometeorites deduced from relict chromite in the small size fraction in ~467 Ma old limestone

Heck,

Schmitz,

Ritter

et al. 2024

Meteorit & Planetary Scien

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Extraterrestrial chrome spinel and chromite extracted from the sedimentary rock record are relicts from coarse micrometeorites and rarely meteorites. They are studied to reconstruct the paleoflux of meteorites to the Earth and the collisional history of the asteroid belt. Minor element concentrations of Ti and V, and oxygen isotopic compositions of these relict minerals were used to classify the meteorite type they stem from, and thus to determine the relative meteorite group abundances through time. While coarse sediment‐dispersed extraterrestrial chrome‐spinel (SEC) grains from ordinary chondrites dominate through the studied time windows in the Phanerozoic, there are exceptions: We have shown that ~467 Ma ago, 1 Ma before the breakup of the L chondrite parent body (LCPB), more than half of the largest (>63 μm diameter) grains were achondritic and originated from differentiated asteroids in contrast to ordinary chondrites which dominated the meteorite flux throughout most of the past 500 Ma. Here, we present a new data set of oxygen isotopic compositions and elemental compositions of 136 grains of a smaller size fraction (32–63 μm) in ~467 Ma old pre‐LCPB limestone from the Lynna River section in western Russia, that was previously studied by elemental analysis. Our study constitutes the most comprehensive oxygen isotopic data set of sediment‐dispersed extraterrestrial chrome spinel to date. We also introduce a Raman spectroscopy‐based method to identify SEC grains and distinguish them from terrestrial chrome spinel with ~97% reliability. We calibrated the Raman method with the established approach using titanium and vanadium concentrations and oxygen isotopic compositions. We find that ordinary chondrites are approximately three times more abundant in the 32–63 μm fraction than achondrites. While abundances of achondrites compared to ordinary chondrites are lower in the 32–63 μm size fraction than in the >63 μm one, achondrites are approximately three times more abundant in the 32–62 μm fraction than they are in the present flux. We find that the sources of SEC grains vary for different grain sizes, mainly as a result of parent body thermal metamorphism. We conclude that the meteorite flux composition ~467 Ma ago ~1 Ma before the breakup of the LCPB was fundamentally different from today and from other time windows studied in the Phanerozoic, but that in contrast to the large size fraction ordinary chondrites dominated the flux in the small size fraction. The high abundance of ordinary chondrites in the studied samples is consistent with the findings based on coarse extraterrestrial chrome‐spinel from other time windows.

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Section: Resultssupporting

confidence: 92%

“…A broad A1g peak shape may arise from low crystallinity and stronger terrestrial weathering. The broad shape of the F2g (v 3 ) peak is due to increased Al 2 O 3 content in comparison to endmember chromites, which show several distinct low‐intensity peaks between ~500 and ~600 cm −1 (Naveen et al., 2019; Wang et al., 2004).…”

Section: Resultsmentioning

confidence: 99%

Unusual sources of fossil micrometeorites deduced from relict chromite in the small size fraction in ~467 Ma old limestone

Heck,

Schmitz,

Ritter

et al. 2024

Meteorit & Planetary Scien

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“…Figure 2b showed the Raman spectrum of pyrite comprising three sharp peaks between 200 cm −1 and 500 cm −1 (343, 380, and 430 cm −1 ) and their positions agree with those reported for FeS 2 [56]. The bands at 400-800 cm −1 in Figure 2c with two peaks at around 557 cm −1 and 693 cm −1 are attributed to chromite on the basis of previous Raman studies [57]. The chalcopyrite samples (Figure 2d) displayed four characteristic peaks at 290, 317, 350, and 470 cm −1 in accordance with Yang et al [58].…”

Section: Characterization Of Mineral Iron Based Catalystssupporting

confidence: 83%

Application of Mineral Iron-Based Natural Catalysts in Electro-Fenton Process: A Comparative Study

et al. 2021

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The potential use of novel iron based mineral catalysts as an effective and available material for electrocatalytic oxidation of refractory contaminants by heterogeneous electro-Fenton (HEF) process was studied for the first time. For this purpose, four natural catalysts, namely ilmenite (FeTiO3), pyrite (FeS2), chromite (FeCr2O4), and chalcopyrite (CuFeS2) were selected as the source of ferrous iron (Fe2+) ions. The catalyst samples were appropriately characterized by X-ray diffraction (XRD) and RAMAN analysis. The degradation kinetics and mineralization rate of 0.2 mM antibiotic cefazolin (CFZ), as a contaminant of emerging concern, were comparatively investigated by HEF using the catalysts mentioned above. The effect of important experimental parameters such as catalysts loading and current on the process efficiency was investigated. Moreover, the performance of these new mineral catalysts was compared in term of CFZ degradation kinetics, mineralization power, mineralization current efficiency and electrical energy consumption. A greater enhancement in degradation/mineralization of CFZ was obtained when using chalcopyrite as the catalyst in HEF. The stability and reusability experiments demonstrated negligible decrease in catalytic activity of chalcopyrite after five consecutive runs. Besides, the rate constant for CFZ oxidation by hydroxyl radicals was estimated according the pseudo-first-order reaction kinetics. The empirical assessment, in addition to economic evaluation, confirmed that iron based mineral catalysts and specifically chalcopyrite could be an appropriate and cost-effective alternative catalyst for HEF due to its high catalytic activity, availability, eco-friendly nature and low energy consumption compared to other synthesized catalysts.

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Mineralogical and Textural Characteristics of Red Boles of Western Deccan Volcanic Province, India: Genetic and Paleoenvironmental Implications

Singh

Pera

Bhattacharya

et al. 2021

Mesozoic Stratigraphy of India

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Mineralogy and spectroscopy (VIS near infrared and micro-Raman) of chromite from Nidar ophiolite complex, SE Ladakh, India: Implications for future planetary exploration

Cited by 10 publications

References 21 publications

Unusual sources of fossil micrometeorites deduced from relict chromite in the small size fraction in ~467 Ma old limestone

Unusual sources of fossil micrometeorites deduced from relict chromite in the small size fraction in ~467 Ma old limestone

Application of Mineral Iron-Based Natural Catalysts in Electro-Fenton Process: A Comparative Study

Mineralogical and Textural Characteristics of Red Boles of Western Deccan Volcanic Province, India: Genetic and Paleoenvironmental Implications

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