Pb diffusion in monazite: New constraints from the experimental study of interdiffusion

Gardès, Emmanuel; Montel, Jean-Marc; Seydoux‐Guillaume, Anne‐Magali; Wirth, Richard

doi:10.1016/j.gca.2007.06.036

Cited by 64 publications

(23 citation statements)

References 15 publications

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“…Experimental Pb diffusivities determined by Cherniak et al (2004) and Gardés et al (2006Gardés et al ( , 2007 are consistent with the reported preservation of precursor monazite ages in granitic rocks (Copeland et al, 1988;Kingsbury et al, 1993;Harrison et al, 1995) and through overprinting granulite facies metamorphism (Parrish, 1990;Spear and Parrish, 1996;Bingen and van Breemen, 1998;Braun et al, 1998;Montel et al, 2000;Rubatto et al, 2001;Bosch et al, 2002). Sluggish rates of Pb diffusion also are suggested by the preservation of sharp compositional boundaries for Pb and for trace and REE elements within individual monazite grains from high-grade metamorphic rocks (DeWolf et al, 1993;Montel et al, 1996;Zhu et al, 1997a;Braun et al, 1998;Cocherie et al, 1998;Crowley and Ghent, 1999;Zhu and O'Nions, 1999a;McFarlane and Harrison, 2006).…”

Section: Pb Diffusionsupporting

confidence: 79%

“…Pb diffusivity in monazite has been investigated experimentally (Smith and Gilleti, 1997;Cherniak et al, 2004;Gardés et al, 2006Gardés et al, , 2007. Smith and Gilleti (1997) imply that Pb diffusion is sufficiently rapid at 600°C, the temperature at which garnets in this study began growth (Hoisch et al, 2002), to maintain isotopic equilibrium between small monazite grains and the matrix.…”

Section: Pb Diffusionmentioning

confidence: 92%

See 1 more Smart Citation

Age trends in garnet-hosted monazite inclusions from upper amphibolite facies schist in the northern Grouse Creek Mountains, Utah

Hoisch

Wells

Grove

2008

Geochimica et Cosmochimica Acta

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Section: Pb Diffusionsupporting

confidence: 79%

Section: Pb Diffusionmentioning

confidence: 92%

Age trends in garnet-hosted monazite inclusions from upper amphibolite facies schist in the northern Grouse Creek Mountains, Utah

Hoisch

Wells

Grove

2008

Geochimica et Cosmochimica Acta

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“…1% of the radiogenic Pb accumulated in a few hundreds of Myr (Parrish, 1990;Kingsbury et al, 1993). Pb is stable in monazite structure (Podor and Cuney, 1997), and presents very low diffusion coeffi cients in most geological processes occurring in the continental crust (Seydoux-Guillaume et al, 2002;Cherniak et al, 2004;Gardés et al, 2007). The monazite structure is also very resistant to metamictization processes (Karioris, Gowda, Cartz, 1991).…”

Section: Theoretical Foundation and Premisesmentioning

confidence: 99%

“…Besides, neoformation and overgrowth mechanisms could lead to polygenetic crystals. Importantly, Pb diffusion is not signifi cant in continental crust environments (e.g., SeydouxGuillaume et al, 2002, Gardés et al, 2007. Thus, some compositional variations among nonisochronic domains in crystals are to be expected, and BSE images may become exceptional guides to defi ne analytical strategies.…”

Section: Transmitted and Reflected Light And Backscattering Electron mentioning

confidence: 99%

“…It does not incorporate signifi cant amounts of Pb when its formation took place (e.g., Parrish, 1990), and contains Th and U abundances that generate measurable radiogenic Pb contents in geologically reduced time interval. Pb diffusion in the structure of monazite is very low under crustal environments (e.g., Cherniak et al, 2004, Gardés et al, 2007, and it presents relatively wide distribution in continental crust. Monazite appears as primary accessory phase in several igneous, average-to high-grade metamorphic, pegmatite, and diverse hydrothermal rocks; as a detritic phase, in psamitic sediments and rocks (e.g., Overstreet, 1967;Chang, Howie, Zussman, 1998).…”

Section: Introductionmentioning

confidence: 99%

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Th-U-PbT dating by electron probe microanalysis, part I. monazite: analytical procedures and data treatment

Vlach

2010

Geol. USP, Sér. cient.

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Dating methodology by the electron probe microanalyser (EPMA) of (Th, U)-bearing minerals, highlighting monazite, acquired greater than ever importance in literature, particularly due to its superior spatial resolution, as well as versatility, which allow correlating petrological processes at times registered only in micro-scales in minerals and rocks with absolute ages. Although the accuracy is inferior to the one achieved with conventional isotopic methods in up to an order of magnitude, EPMA is the instrument that allows the best spatial resolution, reaching a few μm 3 in some conditions. Quantifi cation of minor and trace elements with suitable precision and accuracy involves the own instrumental and analytical set-ups and data treatment strategies, signifi cantly more rigorous when compared with those applied in conventional analyses. Th-U-Pb T dating is an example of these cases. Each EPMA is a unique machine as for its instrumental characteristics and respective automation system. In such a way, analytical procedures ought to be adjusted for laboratory specifi cities. The analytical strategies and data treatment adopted in the Electronic Microprobe Laboratory from Instituto de Geociências of Universidade de São Paulo, Brazil, with a JEOL JXA8600S EPMA, and a ThermoNoran-Voyager 4.3 automation system, are presented and compared with the ones used in other laboratories. The infl uence of instrumental factors and spectral overlaps on Th, U, and Pb quantifi cation is discussed. Applied procedures to interference correction, error propagation, data treatment, and fi nal chemical age presentation as well as to sampling and analyses are emphasized. Some typical applications are discussed, drawing attention to the most relevant aspects of electron microprobe dating.Keywords: Th-U-total Pb dating; Monazite; Microanalysis; Electron probe microanalyser (EPMA). RESUMOA metodologia de datação de minerais portadores de Th e/ou U com microssonda eletrônica (EPMA), com ênfase em monazita, adquiriu enorme importância em literatura, devido a sua alta resolução espacial e versatilidade, que permitem correlacionar processos petrológicos, por vezes registrados apenas em microescala em minerais e rocha, com idades absolutas. Embora a acurácia seja até uma ordem de grandeza inferior à alcançada com os métodos isotópicos convencionais, o EPMA é o equipamento que resulta na melhor resolução espacial, alcançando alguns poucos μm 3 sob algumas condições. A quantifi cação de elementos menores e em traços com precisão e acurácia adequadas envolve estratégias instrumentais, analíticas e de tratamento de dados específi cas e signifi cativamente mais rigorosas quando comparadas com as empregadas em análises convencionais. A datação Th-U-Pb T é um exemplo destes casos. Cada EPMA é um aparelho único em função de suas características instrumentais e sistema de automação e, desta forma, os procedimentos analíticos devem ser ajustados para as especifi cidades de cada laboratório. As estratégias analíticas e de tratamento de dados ado...

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Transmission Electron Microscope Imaging Sharpens Geochronological Interpretation of Zircon and Monazite

Seydoux‐Guillaume

Bingen

Bosse

et al. 2017

Microstructural Geochronology

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show abstract

Pb diffusion in monazite: New constraints from the experimental study of interdiffusion

Cited by 64 publications

References 15 publications

Age trends in garnet-hosted monazite inclusions from upper amphibolite facies schist in the northern Grouse Creek Mountains, Utah

Age trends in garnet-hosted monazite inclusions from upper amphibolite facies schist in the northern Grouse Creek Mountains, Utah

Th-U-PbT dating by electron probe microanalysis, part I. monazite: analytical procedures and data treatment

Transmission Electron Microscope Imaging Sharpens Geochronological Interpretation of Zircon and Monazite

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