Metamictization and fluid-driven alteration triggering massive HFSE and REE mobilization from zircon and titanite: Direct evidence from EMPA imaging and LA-ICP-MS analyses

Kubeš, Martin; Leichmann, Jaromı́r; Wertich, Vojtěch; Mozola, Juraj; Holá, Markéta; Kanický, Viktor; Škoda, Radek

doi:10.1016/j.chemgeo.2021.120593

Cited by 14 publications

(10 citation statements)

References 81 publications

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“…By contrast, the relatively small intrusion of alkali-rich syenites studied here has remarkable geochemical composition and uncertain origin (Leichmann et al, 2004) that has been the focus of only a few petrological/mineralogical studies so far (Kubeš et al, 2021;Leichmann et al, 1998Leichmann et al, , 2004; Škoda et al, 2009). The syenites have attracted attention especially because of their significantly high radioactivity (U ~390 ppm, Th ~700 ppm; Leichmann et al, 1998) dictated by extreme high field strength elements (HFSE) enrichment (e.g., ZrO 2 up to 2.3 wt%; Leichmann et al, 2004) due to extraordinary amount of zircon (up to 5 vol%; Škoda et al, 2009) and its extensive late hydrothermal alteration (Kubeš et al, 2021).…”

Section: Geological Settingsmentioning

confidence: 85%

“…Accessory phases commonly occur as U-thorite, titanite, apatite and ilmenite. Rare relicts of strongly altered thorianite and cheralite were observed exclusively within the central variety (Kubeš et al, 2021).…”

Section: Petrographymentioning

confidence: 97%

“…The petrography of the alkali-rich syenites has been previously described by Leichmann et al (1998) and Kubeš et al (2021), and thus only a brief petrographic description of samples used in this study are given here. The investigated syenite intrusion is exposed on the slopes of the Oslava river valley (two outcrops up to 100 m long) situated ca.…”

Section: Petrographymentioning

confidence: 99%

“…As stated above, apatite has not experienced extensive dissolution during the post-magmatic hydrothermal alteration in contrast to titanite and metamict zircon (Kubeš et al, 2021), and thus represents an ideal phase for dating of (post-)magmatic history of syenites. Overall, twenty-six apatite crystals from marginal variety were analyzed (Table 5).…”

Section: U-pb Apatite Datingmentioning

confidence: 99%

“…LREE-enriched zircon patterns (Fig. 5a), usually ascribed to occurrences of micro-to submicroscopic inclusions (Zhong et al, 2018; references therein), likely reflect the variable intensity of metamictization and/or recrystallization (see Kubeš et al, 2021 for details), indicating that zircon chemistry cannot be considered as a suitable petrogenetic tracer to decipher the magmatic evolution of the host rocks.…”

Section: Mineral Assemblages Unraveling Magmatic Evolution Of Syenitesmentioning

confidence: 99%

See 4 more Smart Citations

Highly evolved miaskitic syenites deciphering the origin and nature of enriched mantle source of ultrapotassic magmatism in the Variscan orogenic root (Bohemian Massif, Moldanubian Zone)

Kubeš

Leichmann

Buriánek

et al. 2022

Lithos

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Section: Geological Settingsmentioning

confidence: 85%

Section: Petrographymentioning

confidence: 97%

Section: Petrographymentioning

confidence: 99%

Section: U-pb Apatite Datingmentioning

confidence: 99%

Section: Mineral Assemblages Unraveling Magmatic Evolution Of Syenitesmentioning

confidence: 99%

See 3 more Smart Citations

Highly evolved miaskitic syenites deciphering the origin and nature of enriched mantle source of ultrapotassic magmatism in the Variscan orogenic root (Bohemian Massif, Moldanubian Zone)

Kubeš

Leichmann

Buriánek

et al. 2022

Lithos

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Ultrapotassic plutons as a source of uranium of vein-type U-deposits (Moldanubian Zone, Bohemian Massif): insights from SIMS uraninite U–Pb dating and trace element geochemistry

Kubeš,

Leichmann,

Wertich

et al. 2024

Miner Deposita

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The Bohemian Massif hosts significant hydrothermal U-deposits associated with shear zones in the high-grade metamorphic basement. But there is a lack of evidence of a genetic link between mineralization and U-fertile igneous rocks. This contribution provides constraints on the major U source of the vein-type U-deposits, the timing of ore formation and the metallogenetic model. The anomalous trace element signatures of the low-temperature hydrothermal deposits (high Zr, Y, Nb, Ti, ∑REE) and their close spatial relation with ultrapotassic rocks of the durbachite series point to a HFSE and REE enriched source rock. The durbachites have high U content (13.4–21.5 ppm) mainly stored in magmatic uraninite and other refractory minerals (e.g., thorite, zircon, allanite) that became metamict over a time interval sufficient to release U from their crystal structure, as suggested by the time gap between emplacement of the durbachites (EMP uraninite U–Pb age ~ 338 Ma) and hydrothermal activity (SIMS uranium ore U–Pb age ~ 270 Ma). Airborne radiometric data show highly variable Th/U ratios (1.5–6.0), likely reflecting a combination between (1) crystallization of magmatic uraninite, (2) hydrothermal alteration, and (3) leaching and mobilization of U along NW–SE-trending fault zones, manifested by elevated Th/U values in the radiometric map. The presence of rare magmatic uraninite in durbachites suggests almost complete uraninite dissolution; EMP imaging coupled with LA-ICP-MS analyses of refractory accessory phases revealed extensive mobilization of U together with HFSE and REE, providing direct evidence for metal leaching via fluid-driven alteration of radiation-damaged U-rich minerals. The large-scale HFSE and REE mobilization, demonstrated by the unusual trace element signatures of the U-deposits, was likely caused by low-temperature (270–300 °C), highly alkaline aqueous solutions containing F-, P-, and K-dominated complexing ligands. The first SIMS U–Pb age of 270.8 ± 7.5 Ma obtained so far for U-mineralization from the Bohemian Massif revealed a main Permian U mineralizing event, related to crustal extension, exhumation of the crystalline basement, and basin formation, as recorded by U–Pb apatite dates (280–290 Ma) and AFT thermal history models of the durbachites. The Permo-Carboniferous sedimentary cover probably represented a source of oxidized basinal brines infiltrating the basement-hosted durbachite plutons and triggering massive metal leaching. The interaction between basin-derived brines and durbachites resulted in significant modification of the chemical composition of the hydrothermal system (K and F release during biotite chloritization, P liberation through monazite alteration), leading to the formation of ore-bearing fluids responsible for the metallogenesis of the basement-hosted unconformity-related U-deposits in shear zones in the Bohemian Massif.

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Redistribution of REE in granitic bedrocks during incipient weathering: insights into the role of groundwater in the formation of regolith-hosted REE deposit

Dou,

Wang,

Xing

et al. 2023

Contrib Mineral Petrol

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Metamictization and fluid-driven alteration triggering massive HFSE and REE mobilization from zircon and titanite: Direct evidence from EMPA imaging and LA-ICP-MS analyses

Cited by 14 publications

References 81 publications

Highly evolved miaskitic syenites deciphering the origin and nature of enriched mantle source of ultrapotassic magmatism in the Variscan orogenic root (Bohemian Massif, Moldanubian Zone)

Highly evolved miaskitic syenites deciphering the origin and nature of enriched mantle source of ultrapotassic magmatism in the Variscan orogenic root (Bohemian Massif, Moldanubian Zone)

Ultrapotassic plutons as a source of uranium of vein-type U-deposits (Moldanubian Zone, Bohemian Massif): insights from SIMS uraninite U–Pb dating and trace element geochemistry

Redistribution of REE in granitic bedrocks during incipient weathering: insights into the role of groundwater in the formation of regolith-hosted REE deposit

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