Orientation relationships of carlsbergite in schreibersite and kamacite in the north Chile iron meteorite

Nolze, Gert; Wagner, G.; Neumann, R. Saliwan; Skála, Roman; Geist, V.

doi:10.1180/0026461067040342

Cited by 5 publications

(8 citation statements)

References 18 publications

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“…EDX analysis revealed that the inclusions are composed of Fe, Ni, and P, which corresponds to rhabdite (schreibersite; [Fe,Ni] 3 P), a common inclusion found in North Chile (Buchwald ; Nolze et al. ). Since the SEM images show that the rhabdite crystals are found three dimensionally within the sample, it can be concluded that the efforts made to avoid the inclusions during the first session had no merit as the inclusions are clearly unavoidable.…”

Section: Methodsmentioning

confidence: 99%

In situ analysis of platinum group elements in equilibrated ordinary chondrite kamacite and taenite

Gilmour

Herd

2020

Meteorit & Planetary Scien

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Platinum group element (PGE) concentrations have been determined in situ in ordinary chondrite kamacite and taenite grains via laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Results demonstrate that PGE concentrations in ordinary chondrite metal (kamacite and taenite) are similar among the three ordinary chondrite groups, in contrast to previous bulk metal studies in which PGE concentrations vary in the order H < L < LL. PGE concentrations are higher in taenite than kamacite, consistent with preferential PGE partitioning into taenite. PGE concentrations vary between and within metal grains, although average concentrations in kamacite broadly agree with results from bulk studies. The variability of PGE concentrations in metal decreases with increasing petrologic type; however, variability is still evident in most type six ordinary chondrites, suggesting that equilibration of PGEs does not occur between metal grains, but rather within individual metal grains via self-diffusion during metamorphism. The constant average PGE concentrations within metal grains across different ordinary chondrite groups are consistent with the formation of metal via nebular condensation prior to the accretion of ordinary chondrite parent bodies. Post-condensation effects, including heating during chondrule-formation events, may have affected some element ratios, but have not significantly affected average metal PGE concentrations. H chondrites Buzzard*Specimens provided by the Smithsonian National Museum of Natural History. All other specimens are from the University of Alberta Meteorite Collection. Provided with the meteorite name is its classification and specimen number.

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Section: Methodsmentioning

confidence: 99%

In situ analysis of platinum group elements in equilibrated ordinary chondrite kamacite and taenite

Gilmour

Herd

2020

Meteorit & Planetary Scien

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“…This area of study is clearly in its infancy. Detailed studies of metallic meteorites have been conducted by scientists in the physical metallurgy field (Goldstein and Michael 2006;He et al 2005;Hutchinson and Hagstrom 2006;Nolze et al 2006), and have focussed on understanding the ␣-␥ orientation relationships in Fe-Ni metal.…”

Section: Meteoritesmentioning

confidence: 99%

EBSD in the Earth Sciences: Applications, Common Practice, and Challenges

Prior

Mariani

Wheeler³

2009

Electron Backscatter Diffraction in Materials Science

114

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“…The discovery of uakitite in conjunction with occurrences for other extraterrestrial nitrides indicates the very interesting regularity in their appearance [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Carlsbergite, uakitite and roaldite are characteristic minerals of iron meteorites, whereas osbornite, nierite and sinoite occur solely in stone meteorites (carbonaceous chondrites, enstatite chondrites and achondrites).…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

“…% ( Table 2). Uakitite is structurally related to carlsbergite CrN and osbornite TiN [1,3,[7][8][9][10]18]. The essential impurity of chromium incorporates in uakitite according to the scheme V 3+ → Cr 3+ , up to 7 mol.…”

Section: Chemical Composition Of Uakititementioning

confidence: 99%

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Uakitite, VN, a New Mononitride Mineral from Uakit Iron Meteorite (IIAB)

et al. 2020

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Uakitite was observed in small troilite–daubréelite (±schreibersite) inclusions (up to 100 µm) and in large troilite–daubréelite nodules (up to 1 cm) in Fe-Ni-metal (kamacite) of the Uakit iron meteorite (IIAB), Republic of Buryatia, Russia. Such associations in the Uakit meteorite seemed to form due to high-temperature (>1000 °C) separation of Fe-Cr-rich sulfide liquid from Fe-metal melt. Most inclusions represent alternation of layers of troilite and daubréelite, which may be a result of solid decay of an initial Fe-Cr-sulfide. These inclusions are partially resorbed and mainly located in fissures of the meteorite, which is now filled with magnetite, and rarely other secondary minerals. Phase relations indicate that uakitite is one of the early minerals in these associations. It forms isometric (cubic) crystals (in daubréelite) or rounded grains (in schreibersite). The size of uakitite grains is usually less than 5 μm. It is associated with sulfides (daubréelite, troilite, grokhovskyite), schreibersite and magnetite. Carlsbergite CrN, a more abundant nitride in the Uakit meteorite, was not found in any assemblages with uakitite. Physical and optical properties of uakitite are quite similar to synthetic VN: yellow and transparent phase with metallic luster; Mohs hardness: 9–10; light gray color with a pinky tint in reflected light; density (calc.) = 6.128 g/cm3. Uakitite is structurally related to the osbornite group minerals: carlsbergite CrN and osbornite TiN. Structural data were obtained for three uakitite crystals using the electron backscatter diffraction (EBSD) technique. Fitting of the EBSD patterns for a synthetic VN model (cubic, Fm-3m, a = 4.1328(3) Å; V = 70.588(9) Å3; Z = 4) resulted in the parameter MAD = 0.14–0.37° (best-good fit). Analytical data for uakitite (n = 54, in wt. %) are: V, 71.33; Cr, 5.58; Fe, 1.56; N, 21.41; Ti, below detection limit (<0.005). The empirical formula (V0.91Cr0.07Fe0.02)1.00N1.00 indicates that chromium incorporates in the structure according to the scheme V3+ → Cr3+ (up to 7 mol. % of the carlsbergite end-member).

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Orientation relationships of carlsbergite in schreibersite and kamacite in the north Chile iron meteorite

Cited by 5 publications

References 18 publications

In situ analysis of platinum group elements in equilibrated ordinary chondrite kamacite and taenite

In situ analysis of platinum group elements in equilibrated ordinary chondrite kamacite and taenite

EBSD in the Earth Sciences: Applications, Common Practice, and Challenges

Uakitite, VN, a New Mononitride Mineral from Uakit Iron Meteorite (IIAB)

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