Liandratite from Karkonosze pegmatites, Sudetes, Southwestern Poland

Matyszczak, Witold

doi:10.1007/s00710-017-0537-8

Cited by 7 publications

(10 citation statements)

References 33 publications

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“…Although the texture may be similar to that of the altered zircon reported by Kusiak et al (2009), the composition is distinct (as the reaction front in the zircon is enriched in Ca, Ba and LREE), pointing to unrelated sources of the fluids. This type of alteration if more consistent with the NYF type of pegmatites described in the pluton (Pieczka and Gołębiowska 2002, Matyszczak 2018, Pieczka et al 2015. Enrichment in Y, HREE, F and Th has also been documented in allanites from two composite dykes (Gros et al 2020).…”

Section: Late-to Post-magmatic Titanitesupporting

confidence: 85%

“…The late-to post-magmatic stage, reflected in various alteration of primary minerals and abundant mineralization, has been documented in many rock varieties from the Karkonosze pluton (Mochnacka and Banaś 2000;Pieczka and Gołębiowska 2002;Mikulski et al 2004;Słaby 2005;Kusiak et al 2009;Mochnacka et al 2015;Matyszczak 2018;Gros et al 2020). Several attempts of dating the hydrothermal activity provided ages, among others, of 309 ± 2 (Re-Os in molybdenite, Mayer et al 2012), 304 ± 2 (SHRIMP U-Pb in zircon, Kusiak et al 2009) and 271 ± 20 Ma (CHIME of monazite and xenotime, Mikulski et al 2004).…”

Section: Late-to Post-magmatic Titanitementioning

confidence: 99%

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Geochemical evolution of a composite pluton: insight from major and trace element chemistry of titanite

et al. 2020

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Titanite from various rocks of the Karkonosze granitoid pluton (South-Eastern Poland) was studied, in order to evaluate its precision in recording magma evolution processes. The rocks are of lamprophyric, dioritic, granodioritic and granitic composition, including hybrid structures such as microgranular magmatic enclaves and composite dykes. Based on textures, chemistry and Zr-in-titanite geothermometry, titanites can be divided into magmatic and post-magmatic populations. Late- to post-magmatic titanite is present in almost all rock types, especially in the most evolved ones (where magmatic titanite is absent) and can be characterized by low trace element and high Al and F contents. Magmatic titanite crystallized in temperatures between 610 and 870 °C, after apatite and relatively simultaneously with amphibole and zircon. Titanite from lamprophyre exhibits compositional features typical of titanites formed in mafic rocks: low Al and F, high Ti4+/(Al + Fe3+), LREE (light rare earth elemet)-enriched chondrite-normalized REE patterns, low Y/Zr, Nb/Zr, Lu/Hf, high (Ce + Nd)/Y, Th/U and Zr. Titanite from hybrid rocks inherited these characteristics, indicating major contribution of the mantle-derived magma especially during early stages of magmatic evolution. Titanite compositional variations, as well as a wide range of crystallization temperatures in hybrid granodiorites point to prolonged crystallization from distinct magma domains of variable mafic versus felsic melt proportions. The extent of compositional variations decreases through subsequent stages of magmatic evolution, and titanite with the least contribution of the mafic component is characterized by higher total REE, Al and F contents, lower Ti4+/(Al + Fe3+), (Ce + Nd)/Y and Th/U ratios, LREE-depleted chondrite-normalized REE patterns and higher Y/Zr, Nb/Zr and Lu/Hf ratios. Titanite composition from the intermediate and late stage hybrids bears signature of decreasing amount of the mafic melt and higher degree of its evolution, however, the exact distinction between the former and the latter is very limited.

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Section: Late-to Post-magmatic Titanitesupporting

confidence: 85%

Section: Late-to Post-magmatic Titanitementioning

confidence: 99%

Geochemical evolution of a composite pluton: insight from major and trace element chemistry of titanite

et al. 2020

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“…These characteristics are typical of secondary pyrochlore [47]. Similar values were reported in pyrochlore supergroup minerals that were partly transformed to liandratite [48]. Low Ca and alkali contents in secondary pyrochlore can also be coupled with enrichments in Sb, up to 25.1-25.9 wt.% Sb2O3.…”

Section: Pyrochlore Supergroupsupporting

confidence: 77%

The Distribution of Rare Metals in the LCT Pegmatites from the Giraúl Field, Angola

et al. 2019

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The Giraúl granitic pegmatite field in Angola is composed of five pegmatite types, the most evolved belong to the beryl-columbite, beryl-columbite-phosphate and spodumene types. Pegmatites are concentrically zoned with increased grain size toward a quartz core; the most evolved pegmatites have well-developed replacement units. These pegmatites are rich in Nb-Ta oxide minerals and the field has a moderate interest for critical elements such as Ta and Hf. Tourmaline, garnet and micas occur as accessory minerals. The abundance of Zr and Nb-Ta minerals increases with the evolution of the pegmatites, as well as the proportions of beryl and Li-rich minerals. The Ta/(Ta + Nb) ratio in Nb-Ta oxide minerals and the Hf/(Hf + Zr) ratio in zircon also increase with the evolution of the pegmatites and within each pegmatite body from border to inner zones, and especially in the late veins and subsolidus replacements. Textural patterns and occurrence of late veins with Ta-rich minerals suggest that Nb and especially Ta can be enriched in late hydrothermal fluids exsolved from the magma, along with Hf and other incompatible elements as Sn, U, Pb, Sb and Bi.

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“…Potassium feldspar, oligoclase, albite, quartz, biotite and muscovite are the main components, however, numerous subordinate and accessory minerals are present. The texture of the pegmatites is usually typical, with concentric or parallel-symmetric zoning and common central miarole (Matyszczak 2018). In a general sense pegmatites in granitoids are believed to form from the remnant magmatic melt (Fersman 1940, pp.…”

Section: Samples and Their Occurrencementioning

confidence: 99%

“…Karkonosze pegmatites are considered essentially as belonging to the niobium-yttrium-fluorine (NYF) family sensu Černý and Ercit (2005, see also Černý et al 2012;Pieczka et al 2015;Evans et al 2018;Matyszczak 2018). Most may be ascribed as close to the euxenite, gadolinite, and allanite-monazite type of rare elements -rare earth elements subclass.…”

Section: Samples and Their Occurrencementioning

confidence: 99%

Acta Geologica Polonica

Kozłowski

Matyszczak

2021

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Fluorite mineralization was studied in the Variscan granitoid Karkonosze pluton in the northern part of the Bohemian massif (Lower Silesia, Poland). Fluid inclusions in fluorite and quartz were investigated by the following methods: heating and freezing on an immersion microscope stage, spectrophotometric and electron probe analysis, calcination and water leachate. The parent fluids of fluorite were of the Na-Ca-Cl type with a low CO₂ content. The fluoride ions had sources in the pluton and in its host rocks. Fluid inclusion observations provide evidence of various post-formation alteration. such as refilling, partition, cracking, migration, expulsion or vacuole modification from irregular to cubic habit. A final model of fluorite origin and parent fluid evolution is presented.

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Liandratite from Karkonosze pegmatites, Sudetes, Southwestern Poland

Cited by 7 publications

References 33 publications

Geochemical evolution of a composite pluton: insight from major and trace element chemistry of titanite

Geochemical evolution of a composite pluton: insight from major and trace element chemistry of titanite

The Distribution of Rare Metals in the LCT Pegmatites from the Giraúl Field, Angola

Acta Geologica Polonica

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