Origin of micrometer-sized impact diamonds in ureilites by catalytic growth involving Fe-Ni-silicide: The example of Kenna meteorite

Barbaro, Anna; Domeneghetti, M. Chiara; Litasov, Konstantin D.; Ferrière, L.; Pittarello, Lidia; Christ, O.; Lorenzon, Sofia; Alvaro, Matteo; Nestola, Fabrizio

doi:10.1016/j.gca.2021.06.022

Cited by 8 publications

(17 citation statements)

References 56 publications

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“…Further proof for this kind of carbon associations and the formation of micro‐sized diamonds during a shock event was given by Barbaro et al. (2021, 2022) for the Kenna and Yamato 74123 ureilites.…”

Section: Introductionmentioning

confidence: 74%

“…Ross et al. (2011) reported an FWHM of 3 cm −1 for a kimberlitic diamond, while Barbaro and coauthors reported an FWHM of 6 cm −1 (Barbaro et al., 2020) and 5 cm −1 (Barbaro et al., 2021, 2022) for lithospheric diamonds. In this work, we used a set of six different lithospheric diamonds from Canada to obtain the correction factor for our instrument.…”

Section: Resultsmentioning

confidence: 99%

“…(2011) and Barbaro et al. (2020, 2021, 2022), the G‐band Γ G values were corrected for the instrumental peak broadening using the same approach as Barbaro et al. (2020), where a lithospheric diamond of high gem quality was used.…”

Section: Resultsmentioning

confidence: 99%

“…(2011) and Barbaro et al. (2020, 2021, 2022) which yielded temperatures of 990 ± 120 °C and 1242 ± 120 to 1314 ± 120 °C, respectively.…”

Section: Introductionmentioning

confidence: 92%

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Shock degree and graphite geothermometry in ureilites NWA 6871 and NWA 3140

Christ

Barbaro

Brenker

et al. 2022

Meteorit & Planetary Scien

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Carbon aggregates from two differently shocked ureilites were analyzed to gain insight into the shock transformation of graphite to diamond in ureilites, which happened when the ureilite parent body (UPB) was most likely destroyed by massive impact events. We present data for carbon aggregates from the highly shocked (U-S6) Northwest Africa (NWA) 6871 and the medium shocked (U-S3) NWA 3140. Both samples contain abundant carbon aggregates which were analyzed by X-ray diffraction and micro-Raman spectroscopy revealing the presence of close associations of (compressed) nanographite, micro-and nanodiamond, as well as Fe-rich phases. Graphite and diamond in NWA 6871 show shock indicators that are absent in NWA 3140. Based on Raman geothermometry on graphite, we calculated mean temperatures of 1368 AE 120 °C and 1370 AE 120 °C for NWA 3140 and NWA 6871, respectively. For comparison, a geothermometer based on the partitioning of Cr between olivine and low-Ca pyroxene was applied on NWA 3140, which yielded a temperature of only 1215 AE 16 °C. The graphite-based temperatures are the highest reported for graphite in ureilites so far and exceed calculated magmatic temperatures for ureilites from silicate-and chromite-based geothermometers. Graphite temperatures fall into the temperature field of catalytic diamond synthesis, which supports the hypothesis of direct transformation from graphite to diamond upon shock. Although the temperatures estimated seem to be independent of the shock degree, they can be ascribed to the shock event that destroyed the UPB.

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Section: Introductionmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…(2011) and Barbaro et al. (2020, 2021, 2022) which yielded temperatures of 990 ± 120 °C and 1242 ± 120 to 1314 ± 120 °C, respectively.…”

Section: Introductionmentioning

confidence: 92%

See 2 more Smart Citations

Shock degree and graphite geothermometry in ureilites NWA 6871 and NWA 3140

Christ

Barbaro

Brenker

et al. 2022

Meteorit & Planetary Scien

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“…5A), indicating that these had achieved sufficiently high temperature during the shock event to complete the thermodynamic transformation. Barbaro et al (50)(51)(52) found nano-and microdiamonds coexisting with nanographite aggregates in ureilite meteorites and estimated 1,200 to 1,300 °C for this phase assemblage. In accordance with these reports, we hypothesize analogous shock T for the Canyon Diablo sample.…”

Section: Discussionmentioning

confidence: 99%

Shock-formed carbon materials with intergrown sp ³ - and sp ² -bonded nanostructured units

Németh

Lancaster

Salzmann

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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Studies of dense carbon materials formed by bolide impacts or produced by laboratory compression provide key information on the high-pressure behavior of carbon and for identifying and designing unique structures for technological applications. However, a major obstacle to studying and designing these materials is an incomplete understanding of their fundamental structures. Here, we report the remarkable structural diversity of cubic/hexagonally ( c / h ) stacked diamond and their association with diamond-graphite nanocomposites containing sp 3 -/sp 2 -bonding patterns, i.e., diaphites, from hard carbon materials formed by shock impact of graphite in the Canyon Diablo iron meteorite. We show evidence for a range of intergrowth types and nanostructures containing unusually short (0.31 nm) graphene spacings and demonstrate that previously neglected or misinterpreted Raman bands can be associated with diaphite structures. Our study provides a structural understanding of the material known as lonsdaleite, previously described as hexagonal diamond, and extends this understanding to other natural and synthetic ultrahard carbon phases. The unique three-dimensional carbon architectures encountered in shock-formed samples can place constraints on the pressure–temperature conditions experienced during an impact and provide exceptional opportunities to engineer the properties of carbon nanocomposite materials and phase assemblages.

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On the occurrences and formation mechanisms of cliftonites: The case of Campo del Cielo iron meteorite

García

Shen

Quirico

et al. 2023

Carbon

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Origin of micrometer-sized impact diamonds in ureilites by catalytic growth involving Fe-Ni-silicide: The example of Kenna meteorite

Cited by 8 publications

References 56 publications

Shock degree and graphite geothermometry in ureilites NWA 6871 and NWA 3140

Shock degree and graphite geothermometry in ureilites NWA 6871 and NWA 3140

Shock-formed carbon materials with intergrown sp ³ - and sp ² -bonded nanostructured units

On the occurrences and formation mechanisms of cliftonites: The case of Campo del Cielo iron meteorite

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Origin of micrometer-sized impact diamonds in ureilites by catalytic growth involving Fe-Ni-silicide: The example of Kenna meteorite

Cited by 8 publications

References 56 publications

Shock degree and graphite geothermometry in ureilites NWA 6871 and NWA 3140

Shock degree and graphite geothermometry in ureilites NWA 6871 and NWA 3140

Shock-formed carbon materials with intergrown sp 3 - and sp 2 -bonded nanostructured units

On the occurrences and formation mechanisms of cliftonites: The case of Campo del Cielo iron meteorite

Contact Info

Product

Resources

About

Shock-formed carbon materials with intergrown sp ³ - and sp ² -bonded nanostructured units