Geochemical Characteristics of Iron Silicides From Lower Cambrian Reefal Limestones, Krasnoyarsk

Novoselova, L. N.; Lyul, A. Yu.

doi:10.1080/00206818609466257

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…) and interpreted as samples of the mantle/core boundary brought to the surface. Fe‐Si and Si 0 have also been reported as detrital grains in limestone from Russia (Novoselova and Lyul’ ; Novgorodova et al. ), and inferences were made to a possible extraterrestrial source.…”

Section: Background: Reduced Fe and Si Phasesmentioning

confidence: 99%

Ultra‐reduced phases in Apollo 16 regolith: Combined field emission electron probe microanalysis and atom probe tomography of submicron Fe‐Si grains in Apollo 16 sample 61500

Gopon

Spicuzza

Kelly

et al. 2017

Meteorit & Planetary Scien

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The lunar regolith contains a variety of chemically reduced phases of interest to planetary scientists and the most common, metallic iron, is generally ascribed to space weathering processes (Lucey et al. 2006). Reports of silicon metal and iron silicides, phases indicative of extremely reducing conditions, in lunar samples are rare (Anand et al. 2004;Spicuzza et al. 2011). Additional examples of Fe-silicides have been identified in a survey of particles from Apollo 16 sample 61501,22. Herein is demonstrated the utility of low keV electron probe microanalysis (EPMA), using the Fe Ll X-ray line, to analyze these submicron phases, and the necessity of accounting for carbon contamination. We document four Fe-Si and Si 0 minerals in lunar regolith return material. The new Fe-Si samples have a composition close to (Fe,Ni) 3 Si, whereas those associated with Si 0 are close to FeSi 2 and Fe 3 Si 7 . Atom probe tomography of (Fe,Ni) 3 Si shows trace levels of C (60 ppma and nanodomains enriched in C, Ni, P, Cr, and Sr). These reduced minerals require orders of magnitude lower oxygen fugacity and more reducing conditions than required to form Fe 0 . Documenting the similarities and differences in these samples is important to constrain their formation processes. These phases potentially formed at high temperatures resulting from a meteorite impact. Whether carbon played a role in achieving the lower oxygen fugacitiesand there is evidence of nearby carbonaceous chondritic material-it remains to be proven that carbon was the necessary component for the unique existence of these Si 0 and iron silicide minerals.

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Section: Background: Reduced Fe and Si Phasesmentioning

confidence: 99%

Ultra‐reduced phases in Apollo 16 regolith: Combined field emission electron probe microanalysis and atom probe tomography of submicron Fe‐Si grains in Apollo 16 sample 61500

Gopon

Spicuzza

Kelly

et al. 2017

Meteorit & Planetary Scien

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Natural Iron Silicides: A Systematic Review

Rappenglück

2022

Minerals

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This review systematically presents all finds of geogenic, impact-induced, and extraterrestrial iron silicide minerals known at the end of 2021. The respective morphological characteristics, composition, proven or reasonably suspected genesis, and possible correlations of different geneses are listed and supported by the available literature (2021). Artificially produced iron silicides are only dealt with insofar as the question of differentiation from natural minerals is concerned, especially regarding dating to pre-industrial and pretechnogenic times.

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Geochemical Characteristics of Iron Silicides From Lower Cambrian Reefal Limestones, Krasnoyarsk

Cited by 2 publications

References 2 publications

Ultra‐reduced phases in Apollo 16 regolith: Combined field emission electron probe microanalysis and atom probe tomography of submicron Fe‐Si grains in Apollo 16 sample 61500

Ultra‐reduced phases in Apollo 16 regolith: Combined field emission electron probe microanalysis and atom probe tomography of submicron Fe‐Si grains in Apollo 16 sample 61500

Natural Iron Silicides: A Systematic Review

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