Phosphate Assemblages From the Brissago Granitic Pegmatite, Western Southern Alps, Switzerland

Vignola, Pietro; Diella, Valeria; Oppizzi, Paolo; Tiepolo, Massimo; Weiss, S.

doi:10.3749/canmin.46.3.635

Cited by 25 publications

(20 citation statements)

References 32 publications

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“…Alluaudite-group minerals of metasomatic origin, derived from triphylitegroup minerals by Na-for-Li exchange, are common in numerous pegmatites worldwide (Moore 1971;Huvelin et al 1972;Fransolet 2007). Metasomatic wolfeite was described among others from the Otov I granitic pegmatite in western Bohemia (Masau et al 2000), whilst stanĕkite, most often as an alteration product of ferrisicklerite, was recently mentioned from Cañada, Spain (Roda et al 2004), Soè Valley, Italy (Guastoni et al 2007) and Brissago, Switzerland (Vignola et al 2008). In the Lutomia pegmatite, a genetic link of the secondary stanĕkite to the primary triphylite (or ferrisiscklerite as a product of topotactic oxidation) is also clearly visible.…”

Section: Evolution Of the Lutomia Pegmatitementioning

confidence: 99%

“…However in the Lutomia pegmatite, similarities with the mineral association stanĕkite + alluaudite + kryzhanovskite to other stanĕkite occurrences, e.g. the Okatjimukuja pegmatite at Karibib, Namibia (Keller et al 1997) and the Brissago pegmatite, Switzerland (Vignola et al 2008) makes the presence of stanĕkite very likely, especially in intergrowths with the alluaudite-group minerals with Fe 3+ /Fe total > 0.50. Brown stanĕkite, often as an alteration product, is found in central parts of ferrisicklerite lamellae altered to heterosite (Figs 3g, 6a).…”

Section: Metasomatic Phosphatesmentioning

confidence: 99%

“…The latter subsequently, upon cooling, broke down to graftonite, i.e. a structure preferring larger Ca 2+ and Mn 2+ cations, and a Ca-and Mn-poor, but Li-, Fe-and Mg-bearing, sarcopside-like phosphate, which further broke down into Li-bearing triphylite and Li-free sarcopside (Wise and Černý 1990;Černý et al 1998;Smeds et al 1998 and references therein; Vignola et al 2008). The assemblage of the magmatic phosphates subsequently underwent metasomatic alteration of a high-T fluid released from the hydrosaline melt that followed the hydrothermal phase.…”

Section: Evolution Of the Lutomia Pegmatitementioning

confidence: 99%

“…The Mn/(Mn + Fe) ratio in the phosphates and associated garnet is commonly used to establish the degree of parental melt evolution (e.g. Černý et al 1998;Smeds et al 1998;Vignola et al 2008). As shown above, in the Lutomia pegmatite the values are different for triphylite-sarcopside and graftonite, and apparently not compatible with garnet.…”

Section: Evolution Of the Lutomia Pegmatitementioning

confidence: 99%

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A phosphate-bearing pegmatite from Lutomia and its relationships to other pegmatites of the Góry Sowie Block, southwestern Poland

Włodek¹,

Grochowina²,

Gołębiowska³

et al. 2015

J. Geosci.

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A geochemically primitive, moderately fractionated, LCT pegmatite from Lutomia (Góry Sowie Block, SW Poland) has been characterized in respect of the primary and secondary phosphate assemblages. The pegmatite crystallized from anatectic granitic magmas mobilized by M 2-3 metamorphism at ~370-380 Ma. Three phosphate assemblages had a different origin: (1) the primary, magmatic one [graftonite-(I)-beusite-(I) + triphylite ± sarcopside], (2) a secondary, metasomatic one [Ca-rich graftonite-(II) -Ca-rich beusite-(II) + wolfeite/triploidite/stanĕkite + hagendorfite/alluaudite + kryzhanovskite ± a Ca-bearing phosphate close to ferromerrillite + fluorapatite], and (3) a secondary, hydrothermal and weathering one [ferrisicklerite ± heterosite + phosphoferrite-kryzhanovskite + ludlamite + vivianite ± hureaulite + earlshannonite-whitmoreite + strunzite-ferrostrunzite + beraunite + dufrénite + jahnsite-(CaMnFe), -(CaMnMn) and -(MnMnMn) + landesite + fairfieldite + Mn 2+ -bearing hydroxyapatite]. The magmatic assemblage resulted from the breakdown of a primary, high-T, Ca-and Li-enriched graftonite-like phase. It was induced by cooling and elevated incompatible Ca, Na, Li and F concentrations. The metasomatic assemblage reflects the destabilization of the magmatic phosphates and their Ca-and Na-metasomatism by a high-T fluid connected with a PO 4 -bearing melt, which previously had evolved along with graftonite-(I)-beusite-(I). The assemblage of secondary, hydrothermal and weathering, phosphates was a result of lower T alteration by hydrothermal fluids and meteoric water by both topotactic Fe and Mn oxidation as well gradual hydration and Fe oxidation. Taken together, the Lutomia pegmatite has been compared to the phosphate-bearing pegmatite at Michałkowa and the mixed NYF + LCT, PO 4 -poor pegmatitic system of Piława Górna.Keywords: phosphate-bearing pegmatite, LCT anatectic pegmatite, Lutomia, Poland Received: 16 October 2013; accepted: 25 November 2014; handling editor: Milan Novák The online version of this article (doi: 10.3190/jgeosci.185) contains supplementary electronic material.Moreover, Łodziński and Sitarz (2009) studied graftonite and sarcopside from Michałkowa.The aim of this paper is a description of the Lutomia pegmatite, as the currently best representative of phosphate pegmatitic mineralization in the GSB, and an evaluation of its relationships to the other important pegmatites in the unit. Particular attention is being paid to textural relations and chemical compositions of the minerals that reflect the geochemical evolution of the pegmatiteforming melts.

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Section: Evolution Of the Lutomia Pegmatitementioning

confidence: 99%

Section: Metasomatic Phosphatesmentioning

confidence: 99%

Section: Evolution Of the Lutomia Pegmatitementioning

confidence: 99%

Section: Evolution Of the Lutomia Pegmatitementioning

confidence: 99%

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A phosphate-bearing pegmatite from Lutomia and its relationships to other pegmatites of the Góry Sowie Block, southwestern Poland

Włodek¹,

Grochowina²,

Gołębiowska³

et al. 2015

J. Geosci.

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“…This group contains primary and weakly oxidized phosphates, as for example minerals of the triphylite-lithiophilite solid-solution series [Li (Fe 2+ Triphylite hosted by Triassic pegmatites embedded into the crystalline basement of the central Southern Alps had been recently described at Brissago (Switzerland) and Piona (Italy) (Vignola et al 2008a(Vignola et al , 2010(Vignola et al , 2011a. In this paper, we report the description of a new Na-bearing mineral species belonging to the triphylite group, karenwebberite, Na (Fe 2+ ,Mn 2+ )PO 4 (IMA 2011-015, Vignola et al 2011b).…”

Section: Introductionmentioning

confidence: 98%

Karenwebberite, Na(Fe2+,Mn2+)PO4, a new member of the triphylite group from the Malpensata pegmatite, Lecco Province, Italy

Vignola

Hatert

Fransolet

et al. 2013

American Mineralogist

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Karenwebberite, Na(Fe 2+ ,Mn 2+ )PO 4 , belongs to the triphylite group of minerals and corresponds to the Fe-equivalent of natrophilite or to the Na-equivalent of triphylite. It occurs in the Malpensata pegmatite dike, Colico, Lecco Province, Italy. Karenwebberite is found as late-magmatic-stage exsolution lamellae up to 100 µm thick, hosted by graftonite and associated with Na-bearing ferrisicklerite and with a heterosite-like phase. Lamellae are pale green, with very pale grayish-green streak. The luster is greasy to vitreous, and lamellae are translucent (pale green) to opaque (dark green). Optically, the mineral is anisotropic, biaxial (+), α = 1.701(2), β = 1.708(2), γ = 1.717(2) (for λ = 589 nm), 2V meas = 87(4)°, 2V calc = 41°, Z = b. Pleochroism is moderate with X = dark gray, Y = brown, and Z = yellow. The mineral is brittle with a Mohs hardness of 4.5; in thin section it displays a perfect cleavage along {001} with an irregular fracture. Karenwebberite is non-fluorescent either under short-wave or long-wave ultraviolet light, and its calculated density is 3.65 g/cm 3 . The mean chemical composition, determined by the electron microprobe from 16 point analyses (wt%), is: P 2 O 5 41.12, Fe 2 O 3 * 7.00, FeO* 25.82, MgO 0.23, ZnO 0.11, MnO 9.31, CaO 0.10, Na 2 O 14.66, total 98.41 (*: calculated values). The empirical formula, calculated on the basis of 1 P atom per formula unit from, is (Na 0.817 Ca 0.003 o 0.180 ) Σ1.000 (Fe 2+ 0.622 Mn 2+ 0.228 Fe 3+ 0.151 Mg 0.010 Zn 0.002 ) Σ1.013 PO 4 . Karenwebberite is orthorhombic, space group Pbnm, a = 4.882(1), b = 10.387 (2), c = 6.091(1) Å, V = 308.9(1) Å 3 , and Z = 4. The mineral possesses the olivine structure, with the M1 octahedra occupied by Na, and the M2 octahedra occupied by Fe and Mn. The eight strongest lines in the X-ray powder pattern are [d in Å (intensities) (hkl)]: 5.16 (50) (020), 4.44

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Major and Trace Element Signatures in Lagoon Vivianite: A Case Study from the Kerch Ooidal Ironstones

Nekipelova

Kokh

Sokol

et al. 2023

Springer Proceedings in Earth and Environmental Sciences

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Phosphate Assemblages From the Brissago Granitic Pegmatite, Western Southern Alps, Switzerland

Cited by 25 publications

References 32 publications

A phosphate-bearing pegmatite from Lutomia and its relationships to other pegmatites of the Góry Sowie Block, southwestern Poland

A phosphate-bearing pegmatite from Lutomia and its relationships to other pegmatites of the Góry Sowie Block, southwestern Poland

Karenwebberite, Na(Fe2+,Mn2+)PO4, a new member of the triphylite group from the Malpensata pegmatite, Lecco Province, Italy

Major and Trace Element Signatures in Lagoon Vivianite: A Case Study from the Kerch Ooidal Ironstones

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