Quantifying the Tetrad Effect, Shape Components, and Ce–Eu–Gd Anomalies in Rare Earth Element Patterns

Anenburg, Michael; Williams, Morgan

doi:10.1007/s11004-021-09959-5

Cited by 38 publications

(19 citation statements)

References 49 publications

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“…REE patterns were fitted, and tetrad effect were calculated using BlambdaR/ AlambdaR method (Anenburg 2020;Anenburg and Williams 2022). 1 and Supplementary Table 3).…”

mentioning

confidence: 99%

Gadolinium-dominant monazite and xenotime: Selective hydrothermal enrichment of middle REE during low-temperature alteration of uraninite, brannerite, and fluorapatite (the Zimná Voda REE-U-Au quartz vein, Western Carpathians, Slovakia)

Ondrejka

Uher

Ferenc

et al. 2023

American Mineralogist

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A hydrothermal quartz vein with REE-U-Au mineralization in the Zimná Voda (Gemeric Unit, Western Carpathians, Slovakia) is associated with contact metamorphism between Permian granites and host phyllites and metaquartzites. It contains unique REE minerals of the monazite and xenotime groups. Monazite-(Ce), monazite-(Nd), monazite-(Sm), and Gd-dominant monazite [“monazite-(Gd)”], along with xenotime-(Y) to Gd-dominant xenotime [“xenotime-(Gd)”] and Gd-rich hingganite-(Y) show heterogeneous compositions and reflect a strong fractionation trend toward the enrichment of MREE (Sm to Dy), particularly Gd. Here, the gadolinium abundance reported in “monazite-(Gd)” (≤23.4 wt% Gd2O3) and Gd-rich xenotime-(Y) to “xenotime-(Gd)” (≤28.7 wt% Gd2O3) and accompanied by Gd-rich hingganite-(Y) (≤15.8 wt% Gd2O3), is among the highest Gd concentrations ever reported in natural minerals. The Gd-richest compositions show the following formulas: (Gd0.31Sm0.24 Nd0.15Ce0.10La0.05Dy0.03Y0.03…)0.98PO4 [“monazite-(Gd)”], (Gd0.36Y0.32Dy0.13Sm0.08Tb0.05…)0.98 (P0.96As0.04)1.00O4 [“xenotime-(Gd)”] and (Y0.71Gd0.43Dy0.23Sm0.22Tb0.06Er0.04Nd0.06…Ca0.06)1.96 (☐0.87Fe0.132+)1.00(Be1.82B0.18)2.00(Si1.90As0.10)2.00O8(OH1.70O0.30)2.00 [hingganite-(Y)]. The MREE-rich monazites, xenotimes, and hingganite-(Y) precipitated in response to the alteration of primary uraninite, brannerite, and fluorapatite by low-temperature hydrothermal fluids of heterogeneous compositions on a microscale. These are responsible for the strong enrichment of individual MREE, especially Gd in the secondary minerals. This is accompanied by the advancing development of the W-type tetrad effect on REE through monazite species. The substantial incorporation of Gd into both REE-selective monazite and xenotime structures that are accompanied by LREE vs. HREE segregation indicates the possibility of differently sized REE3+ miscibility in REEPO4 solid solutions, as well as the stabilization of the Gd-rich orthophosphate structure by substitution of the remaining A-site cations with smaller HREE+Y in the xenotime-type, and/or larger LREE in the monazite-type structure.

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“…REE patterns were fitted, and tetrad effect were calculated using BlambdaR/ AlambdaR method (Anenburg 2020;Anenburg and Williams 2022). 1 and Supplementary Table 3).…”

mentioning

confidence: 99%

Gadolinium-dominant monazite and xenotime: Selective hydrothermal enrichment of middle REE during low-temperature alteration of uraninite, brannerite, and fluorapatite (the Zimná Voda REE-U-Au quartz vein, Western Carpathians, Slovakia)

Ondrejka

Uher

Ferenc

et al. 2023

American Mineralogist

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“…The reader is referred to ref. 71 for information about the lambda (λn) parameters, which were calculated using BLambdaR 72 . evidence of mineral alteration is detected (Fig.…”

Section: Discussionmentioning

confidence: 99%

Dating mylonitic overprinting of ancient rocks

Kirkland

Olierook

Danišík

et al. 2023

Commun Earth Environ

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Deformation in shear zones is difficult to date because mylonites can preserve partially reset pre-existing isotopic signatures. However, mylonites can be key structural elements in terrane recognition, so an accurate estimation of their age is important. Here we determine the in situ Rb–Sr isotopic composition of mica from major NE-SW trending mylonitic zones in the Archean Akia Terrane of Greenland and complement this information with inverse thermal history modelling. Rb–Sr isochrons indicate a dominant age of radiogenic-Sr accumulation in biotite of around 1750 million years (Ma) ago. Yet, magmatic titanite is unreset yielding a U–Pb age of around 2970 Ma. These constraints require that biotite Rb–Sr directly dates mylonitic fabric generation. The 1750 Ma mylonites, associated with the Proterozoic Nagssugtoqidian Orogeny, overprint Archean crust widely regarded as preserving evidence of early Earth horizontal tectonics.

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“…REE patterns from Figure 1b are plotted as red stars. Interested readers can experiment with the interactive apps at https://lambdar.rses.anu.edu.au/ to gain an intuitive grasp of the lambda method and how these coefficients correspond to REE patterns (Anenburg, 2020; Anenburg & Williams, 2022; O'Neill, 2016).…”

Section: Ree Pattern Modelingmentioning

confidence: 99%

Porphyry Copper Deposit Formation: Identifying Garnet and Amphibole Fractionation With REE Pattern Curvature Modeling

Tatnell

Anenburg

Loucks

2023

Geophysical Research Letters

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Empirical evidence for high oxidation state of porphyry-copper-deposit (PCD) generative arc magmas has been noted and discussed for decades (Burnham & Ohmoto, 1980;Hutchinson & Dilles, 2019;Park et al., 2021). These magmas typically record oxygen fugacity (fO 2 ) values equal or greater than the Ni-NiO fO 2 buffer (Sun et al., 2015). The importance of high oxidation state to copper metallogenic fertility is the 10-to 20-fold increase in a silicate melt sulfur-carrying capacity as it rises into the predominance range of sulfate (

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Quantifying the Tetrad Effect, Shape Components, and Ce–Eu–Gd Anomalies in Rare Earth Element Patterns

Cited by 38 publications

References 49 publications

Gadolinium-dominant monazite and xenotime: Selective hydrothermal enrichment of middle REE during low-temperature alteration of uraninite, brannerite, and fluorapatite (the Zimná Voda REE-U-Au quartz vein, Western Carpathians, Slovakia)

Gadolinium-dominant monazite and xenotime: Selective hydrothermal enrichment of middle REE during low-temperature alteration of uraninite, brannerite, and fluorapatite (the Zimná Voda REE-U-Au quartz vein, Western Carpathians, Slovakia)

Dating mylonitic overprinting of ancient rocks

Porphyry Copper Deposit Formation: Identifying Garnet and Amphibole Fractionation With REE Pattern Curvature Modeling

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