Oxykinoshitalite, a New Species of Mica From Fernando De Noronha Island, Pernambuco, Brazil: Occurrence and Crystal Structure

Kogarko, L. N.; Uvarova, Yulia; Sokolova, Elena; Hawthorne, Frank C.; Ottolini, Luisa; Grice, Joel D.

doi:10.2113/gscanmin.43.5.1501

Cited by 33 publications

(22 citation statements)

References 23 publications

(23 reference statements)

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“…Oxykinoshitalite was described as a new species from olivine nephelinite composed of olivine, clinopyroxene, Fig. 7 Fe-Ti oxide, nepheline, calcite, apatite and K-rich feldspar (Kogarko et al 2005), an assemblage analogous to the examined slag. The occurrence of oxykinoshitalite in the border zone suggests local enrichment in water, which is a rather uncommon feature in pyrometallurgical slags.…”

Section: Discussionmentioning

confidence: 99%

Mineralogy and origin of coarse-grained segregations in the pyrometallurgical Zn-Pb slags from Katowice-Wełnowiec (Poland)

et al. 2016

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The unique among pyrometallurgical slags, coarsegrained (up to 2.5 cm) segregations (up to 40 cm long) rimmed by Baplitic^border zones occur within holocrystalline historical Zn-smelting slag in Katowice, S Poland. Slag surrounding the segregations consists of olivine, spinel series, melilite, clinopyroxene, leucite, nepheline and sulphides. Ca-olivines, kalsilite and mica compositionally similar to oxykinoshitalite occur in border zones in addition to olivine, spinel series and melilite. Miarolitic and massive pegmatite-like segregations are built of subhedral crystals of melilite, leucite, spinel series, clinopyroxene and hematite. Melilite, clinopyroxenes and spinels in the segregations are enriched in Zn relatively to original slag and to fine-grained border zones. The segregations originated as a result of crystallization from residual melt rich in volatiles (presumably CO 2 ). The volatilerich melt was separated during fractional crystallization of molten slag under the cover of the overlying hot (ca. 1250°C) vesicular slag, preventing the escape of volatiles. That unique slag system is analogous to natural magmatic systems.

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Section: Discussionmentioning

confidence: 99%

Mineralogy and origin of coarse-grained segregations in the pyrometallurgical Zn-Pb slags from Katowice-Wełnowiec (Poland)

et al. 2016

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“…Barium-and Ti-rich micas have been described in alkaline mafic volcanic lithologies, such as lamproites, basanites, leucitites, and nephelinites (Mansker et al 1979, Edgar 1992, Zhang et al 1993b, Seifert & Kämpf 1994, Kogarko et al 2005, and less commonly in rocks of gabbroic affinity (Shaw & Penczak 1996, Henderson & Foland 1996.…”

Section: Background Informationmentioning

confidence: 99%

“…8B, Table 4). The substitution of K by Ba in igneous biotite is generally related to the coupled substitution XII Ba 2+ + IV Al 3+ = XII K + + Si 4+ (Wendlandt 1977, Mansker et al 1979, Edgar 1992, Seifert & Kämpf 1994, Kogarko et al 2005, i.e., solid solution toward the kinoshitalite end-member, BaMg 3 Si 2 Al 2 O 10 (OH) 2 (Dasgupta et al 1989, Gnos & Armbruster 2000. The compositions with Ba content above 1.0 wt% BaO show a correlation near the 1:1 slope (Figs.…”

Section: Ba-and Ti-rich Biotitementioning

confidence: 99%

Zr- AND Ba-RICH MINERALS FROM THE PONTE NOVA ALKALINE MAFIC-ULTRAMAFIC MASSIF, SOUTHEASTERN BRAZIL: INDICATION OF AN ENRICHED MANTLE SOURCE

Azzone

Ruberti

Enrich

et al. 2009

The Canadian Mineralogist

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Zirconium-and Ba-rich minerals are found in gabbroic rocks from the Ponte Nova alkaline mafic-ultramafic massif in southeastern Brazil. The unusual mineralogical assemblage includes zirconolite, baddeleyite, Ba-rich alkali feldspar, and Baand Ti-rich biotite. Zirconolite of the Ponte Nova massif has higher levels of Zr (up to 1.172 apfu) than those registered in other terrestrial rocks and a prominent enrichment in the light rare-earth elements. Baddeleyite contains small quantities of Hf, Ti, and Fe. The Ba-rich alkali feldspar and Ba-and Ti-rich biotite contain up to 9.25 and 7.35 wt% BaO, respectively, and the biotite contains up to 12.01 wt% TiO 2 . In the different intrusions of the Ponte Nova massif, such an unusual assemblage typifies the residual magma after the crystallization of clinopyroxene and olivine from previously enriched basanitic parental magma. The different trends of enrichments in REE and Th + U found for zirconolite of the intrusions of the Ponte Nova massif provide a better understanding of the variable degrees of enrichment of incompatible elements of the distinct gabbroic bodies. A lithospheric mantle source enriched in incompatible elements by the metasomatic action of volatile-rich fluids and with the presence of phlogopite or amphibole (or both) and other minor accessory phases could explain the presence of the Zr-and Ba-rich minerals in this gabbroic massif.

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“…[7]; cf. also micas data from lamproites, with a similar behavior, [41] (c.f discussion and references in [42]). Many of the analized micas in the Quixaba melanephelinites, as described above (cf.…”

Section: Micasmentioning

confidence: 71%

“…Clinopyroxenes are homogeneous in these rocks (salites, with rims of titaniferous salite), with some differences observed in their mg# numbers and Ca contents, thus somewhat dependent on magma composition. The micas are usually late interstitial minerals, enriched in Ti, F and Ba, late-magmatic components (up to 19% BaO, 6% of F, and 14% TiO 2 [40,42]); they belong mostly to the kinoshitalite-oxykinoshitalite series, as defined in [42].…”

Section: Discussionmentioning

confidence: 99%

The volcanic-subvolcanic rocks of the fernando de noronha archipelago, southern atlantic ocean: Mineral chemistry

Lopes

Ulbrich²,

Ulbrich³

2014

Open Geosciences

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Fernando de Noronha archipelago presents an older Remédios Formation with subvolcanic intrusions, belonging to two different alkaline series, the sodic (undersaturated: basanites, tephrites, essexites, tephriphonolites, phonolites), and potassic ones (mildly undersaturated to silicic, with alkali basalts, basaltic trachyandesites, trachyandesites, trachytes), and lamprophyres. The upper Quixaba Formation presents nephelinite flows and basanites. A third minor unit, São José, is constituted by basanites carrying mantle xenoliths. Magnesian olivines occur in the Remédios basanites and alkali basalts, and in nephelinites. Melilites are present as groundmass grains in melilite melanephelinites (MEM). Clinopyroxenes (cpx) are mostly salites to titaniferous salites (Remédios sodic series), grading into aegirines in the differentiated aphyric phonolites. Cpx in the lamprophyres show disequilibrium textures. In the Quixaba flows, cpx are salites, enriched in Mg (especially in MEM). Amphiboles, remarkably, are common in tephriphonolites and phonolites and in basaltic trachyandesites, sometimes with disequilibrum zoning textures, and a conspicuous phase in lamprophyres. Dark micas are present as groundmass plates in MEM, OLM and PYM (olivine and pyroxene melanephelinites), with compositional variety (enriched in Ti, Ba, Sr) depending on the composition of the parent rock; BaO can be as high as 16–19%. Feldspars crystallize as calcic plagioclases, sanidines and anorthoclases, depending on the rock types, as phenocrysts and in groundmass, both in Quixaba and Remédios rocks; they are absent in nephelinites. Nephelines are found in Remédios sodic series types and Quixaba rocks. Haüyne and noseane are rarely observed in Remédios rocks.

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Oxykinoshitalite, a New Species of Mica From Fernando De Noronha Island, Pernambuco, Brazil: Occurrence and Crystal Structure

Cited by 33 publications

References 23 publications

Mineralogy and origin of coarse-grained segregations in the pyrometallurgical Zn-Pb slags from Katowice-Wełnowiec (Poland)

Mineralogy and origin of coarse-grained segregations in the pyrometallurgical Zn-Pb slags from Katowice-Wełnowiec (Poland)

Zr- AND Ba-RICH MINERALS FROM THE PONTE NOVA ALKALINE MAFIC-ULTRAMAFIC MASSIF, SOUTHEASTERN BRAZIL: INDICATION OF AN ENRICHED MANTLE SOURCE

The volcanic-subvolcanic rocks of the fernando de noronha archipelago, southern atlantic ocean: Mineral chemistry

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