The first occurrence of qandilite in Russia

Oktyabrsky, R. A.; Shcheka, S. A.; Lennikov, A. M.; Afanasyeva, Tamara B.

doi:10.1180/minmag.1992.056.384.11

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…One Hermezi 1985), Ballachullish, Scotland (Ferry 1996), East Greenland (Gittins et al 1982), and Kondyor, Russia (Oktyabrsky et al 1992).…”

Section: Conditions Of Stability Of Qandilitementioning

confidence: 99%

“…The mineral was named from its occurrence in skarn xenoliths in a diorite intrusion from the Qala-Dizeh region, Iraq (Al-Hermezi 1985). Other occurrences include one from carbonate wallrocks of a shallow-seated alkaline ultramafic intrusion in the Kangerdlugssuaq region of East Greenland (Gittins et al 1982), one from the contact zone of the Kondyor alkaline-ultramafic massif, Russia (Oktyabrsky et al 1992), and one from metamorphosed others, by Lacroix (1893), by Fulignati et al (1998Fulignati et al ( , 2005 for the 79 AD eruption, Fulignati et al (2001) for the "Pollena" 472 AD eruption, Crocetti (1996) for the 1631 AD eruption, and Fulignati et al (2000Fulignati et al ( , 2004 for the 1944 AD eruption.…”

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confidence: 99%

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Qandilite From Vesuvius Skarn Ejecta: Conditions of Formation and Miscibility Gap in the Ternary Spinel - Qandilite - Magnesioferrite

Pascal

Fonteilles

Boudouma

et al. 2011

The Canadian Mineralogist

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Qandilite (Mg 2 TiO 4 ) and magnesioferrite occur in forsterite -spinel -calcite skarn ejecta from Mt. Vesuvius, Italy, with an exceptionally large compositional range that outlines the miscibility gap in the system spinel -qandilite -magnesioferrite (with a small amount of Fe 2+ ), at present solely determined on the spinel-qandilite binary at T > 1000°C. The analyzed spinelqandilite and spinel-magnesioferrite pairs are consistent with the solvus and tie-lines (except for a temperature offset) derived from the thermochemical model of spinel solid-solutions. Temperatures of formation in the range 650-700°C are inferred from the petrological study of the skarn-forming processes involved, which typically include two types of metasomatic reactions, i.e., formation of spinel -forsterite -calcite endoskarns by desilication of aluminosilicate bodies at the contact of dolostone wallrocks, and reaction of such pre-existing endoskarns with new influxes of magma ± fluid. Calculated phase-relations among qandilite, perovskite and geikielite show that qandilite with moderate magnesioferrite contents is the high-temperature Ti mineral stable in magnesian and extremely silica-deficient surroundings under oxidized conditions.

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“…One Hermezi 1985), Ballachullish, Scotland (Ferry 1996), East Greenland (Gittins et al 1982), and Kondyor, Russia (Oktyabrsky et al 1992).…”

Section: Conditions Of Stability Of Qandilitementioning

confidence: 99%

mentioning

confidence: 99%

Qandilite From Vesuvius Skarn Ejecta: Conditions of Formation and Miscibility Gap in the Ternary Spinel - Qandilite - Magnesioferrite

Pascal

Fonteilles

Boudouma

et al. 2011

The Canadian Mineralogist

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“…Associated carbonate rocks consist of periclaseforsterite -brucite marble and calc-silicate assemblages containing qandilite, the rare Ti-Mg spinel-group mineral (Oktyabrsky et al 1992), as well as monticellite + melilite, vesuvianite + clintonite, grossular + diopside and scapolite-bearing varieties of skarn (Lennikov et al 1991, Marakushev et al 1990). …”

Section: The Contact Aureolementioning

confidence: 99%

Compositional Variations in Platinum-Group Minerals and Gold, Konder Alkaline-Ultrabasic Massif, Aldan Shield, Russia

Nekrasov¹,

Lennikov²,

Zalishchak³

et al. 2005

The Canadian Mineralogist

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The platinum-group minerals (PGM) of the Konder zoned alkali-ultrabasic massif, located east of the Aldan Shield, in fareastern Russia, are predominantly represented by isoferroplatinum of two generations, both with Fe contents ranging from 7.5 to 11.5 wt.%. A high-temperature isoferroplatinum is saturated with platinum-group-element (PGE) impurities: up to 5.3 Ir, 2.9 Os, and 1.8 Rh (all in wt.%). In contrast, the later isoferroplatinum contains lower levels of Ir, Os and Rh: less than 1.9 Ir, 1.0 Os, 0.6 Rh (in wt.%). The minor PGM are represented by a wide range of solid solutions in the system Os-Ir-Rh-Pt, tetraferroplatinum, tulameenite, hongshiite, minerals of erlichmanite-laurite and irarsite-hollingworthite series, sperrylite, bismuthides, antimonides, tellurides, stannides, and hydroxides. There are possibly new mineral species: native ruthenium, the Pd-dominant analogue of hongshiite, Pt 2 As 3 , the Pt-dominant analogue of konderite and inaglyite, and others minerals, which form rims around grains of isoferroplatinum and inclusions in it. A similar morphology and distribution as found with Pt 3 Fe are observed with gold, related to rare lenses of sulfide and impregnations in dunite (Cu-, Pt-, and Pd-bearing high-grade gold) and monzodiorite cutting dunite (low-impurity middle-and low-grade gold).

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“…4. To test the OxyEMG program, oxyspinel group endmember's data were taken from de Waal (1978), Droop (1987), Oktyabrsky et al (1992), Bjerg et al (1993), Gutzmer et al (1995), the Handbook of Mineralogy .pdf files (Anthony et al, 2001(Anthony et al, -2005, Bosi et al (2002Bosi et al ( , 2009Bosi et al ( , 2010Bosi et al ( , 2014, Lenaz et al (2011), Antao et al (2019, Kompanchenko (2020), and Yavuz and Yavuz (2023) (Tables S1-S6).…”

Section: Important Considerations When Using Oxyemgmentioning

confidence: 99%

OxyEMG: an application for determination of the oxyspinel group end-members based on electron microprobe analyses

Ferracutti,

Asiain,

Antonini

et al. 2024

Eur. J. Mineral.

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Abstract. The Oxyspinel group End-Member Generator (OxyEMG) is an improved version of the EMG application. This new version allows for calculating, based on electron microprobe analysis (EMPA), the proportions of 31 end-member components in an oxyspinel composition. These components are MgAl2O4 (spinel), FeAl2O4 (hercynite), MnAl2O4 (galaxite), ZnAl2O4 (gahnite), NiAl2O4 (chihmingite), CuAl2O4 (thermaerogenite), MgFe2O4 (magnesioferrite), Fe3O4 (magnetite), MnFe2O4 (jacobsite), ZnFe2O4 (franklinite), NiFe2O4 (trevorite), CuFe2O4 (cuprospinel), FeMn2O4, MgMn2O4, Mn3O4 (hausmannite), ZnMn2O4 (hetaerolite), MgCr2O4 (magnesiochromite), FeCr2O4 (chromite), MnCr2O4 (manganochromite), ZnCr2O4 (zincochromite), NiCr2O4 (nichromite), CoCr2O4 (cochromite), MgV2O4 (magnesiocoulsonite), FeV2O4 (coulsonite), MnV2O4 (vuorelainenite), Co3O4 (guite), TiMg2O4 (qandilite), TiFe2O4 (ulvöspinel), SiMg2O4 (ringwoodite), SiFe2O4 (ahrensite) and GeFe2O4 (brunogeierite). Compared with the older version, OxyEMG allows for (a) calculating 12 additional oxyspinel group end-member compositions (chihmingite, thermaerogenite, hausmannite, hetaerolite, FeMn2O4, MgMn2O4, cuprospinel, cochromite, guite, ringwoodite, ahrensite and brunogeierite), (b) discriminating the cation valency not only for Fe2+–Fe3+ but also for Mn2+–Mn3+ and Co2+–Co3+, and (c) changing the method to calculate the components of the magnetite and ulvöspinel prisms. As in EMG, this new version is an application that does not require an installation process and was created with the purpose of performing calculations to obtain cation proportions (per formula unit, p.f.u.), end-members of the oxyspinel group, a ΣR3+ value, a ΣR2+ value, ΣR3+ / ΣR2+ ratios, redistribution proportions for the corresponding end-members in the magnetite or ulvöspinel prisms, and a data validation section to check the results.

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The first occurrence of qandilite in Russia

Cited by 6 publications

References 3 publications

Qandilite From Vesuvius Skarn Ejecta: Conditions of Formation and Miscibility Gap in the Ternary Spinel - Qandilite - Magnesioferrite

Qandilite From Vesuvius Skarn Ejecta: Conditions of Formation and Miscibility Gap in the Ternary Spinel - Qandilite - Magnesioferrite

Compositional Variations in Platinum-Group Minerals and Gold, Konder Alkaline-Ultrabasic Massif, Aldan Shield, Russia

OxyEMG: an application for determination of the oxyspinel group end-members based on electron microprobe analyses

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