Pb diffusion in zircon

Cherniak, D. J.; Watson, E. Bruce

doi:10.1016/s0009-2541(00)00233-3

Cited by 1,033 publications

(473 citation statements)

References 52 publications

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“…Experimental results (Cherniak and Watson 2000) show that at ca. 750 °C it would take several billion years for a crystalline zircon with 10 µm radius to lose 1% of its lead.…”

Section: Heterogeneities Between and Within Individual Samplesmentioning

confidence: 96%

“…Cherniak and Watson 2003;Hoskin and Schaltegger 2003;Harley et al 2007;Rubatto 2017). Rubatto and Gebauer (2000) reported that internal zircon textures shown by CL-images are mostly caused by trace elements such as Dy, Gd, Tb and U, so the preservation of CL-structures does not indicate preservation of the U-Pb growth age (Cherniak and Watson 2000).…”

Section: Heterogeneities Between and Within Individual Samplesmentioning

confidence: 99%

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Zircon ages in granulite facies rocks: decoupling from geochemistry above 850 °C?

Kunz

Regis

Engi

2018

Contrib Mineral Petrol

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Granulite facies rocks frequently show a large spread in their zircon ages, the interpretation of which raises questions: Has the isotopic system been disturbed? By what process(es) and conditions did the alteration occur? Can the dates be regarded as real ages, reflecting several growth episodes? Furthermore, under some circumstances of (ultra-)high-temperature metamorphism, decoupling of zircon U-Pb dates from their trace element geochemistry has been reported. Understanding these processes is crucial to help interpret such dates in the context of the P-T history. Our study presents evidence for decoupling in zircon from the highest grade metapelites (> 850 °C) taken along a continuous high-temperature metamorphic field gradient in the Ivrea Zone (NW Italy). These rocks represent a well-characterised segment of Permian lower continental crust with a protracted high-temperature history. Cathodoluminescence images reveal that zircons in the mid-amphibolite facies preserve mainly detrital cores with narrow overgrowths. In the upper amphibolite and granulite facies, preserved detrital cores decrease and metamorphic zircon increases in quantity. Across all samples we document a sequence of four rim generations based on textures. U-Pb dates, Th/U ratios and Ti-in-zircon concentrations show an essentially continuous evolution with increasing metamorphic grade, except in the samples from the granulite facies, which display significant scatter in age and chemistry. We associate the observed decoupling of zircon systematics in high-grade non-metamict zircon with disturbance processes related to differences in behaviour of non-formula elements (i.e. Pb, Th, U, Ti) at high-temperature conditions, notably differences in compatibility within the crystal structure.

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“…Experimental results (Cherniak and Watson 2000) show that at ca. 750 °C it would take several billion years for a crystalline zircon with 10 µm radius to lose 1% of its lead.…”

Section: Heterogeneities Between and Within Individual Samplesmentioning

confidence: 96%

Section: Heterogeneities Between and Within Individual Samplesmentioning

confidence: 99%

Zircon ages in granulite facies rocks: decoupling from geochemistry above 850 °C?

Kunz

Regis

Engi

2018

Contrib Mineral Petrol

View full text Add to dashboard Cite

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“…In recent years, sedimentary provenance technology has been improved by single grain radiometric dating of grain populations, for example detrital zircon U-Pb dating (Cawood and Nemchin, 2000;Fonneland et al, 2004;Morton et al, 2008;Beltrán-Triviño et al, 2013). Zircon as a kind of stable mineral can withstand the effects of weathering, erosion and thermal alteration (Cherniak and Watson, 2001;Košler and Sylvester, 2003), and possess a stable U-Pb isotopic system over a wide range of pressures, temperatures and fluid composition (Moecher and Samson, 2006;Zhao et al, 2013). The data of detrital zircon can provide more accurate and useful information of source areas, which makes it a powerful tool for basin provenance analysis that has been widely used all over the world in the last decade.…”

Section: Introductionmentioning

confidence: 99%

Provenance of Upper Miocene to Quaternary sediments in the Yinggehai-Song Hong Basin, South China Sea: Evidence from detrital zircon U–Pb ages

et al. 2014

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“…This method is commonly used to date Phanerozoic zircons using in situ methods [42,47]. The closure temperature of magmatic zircon is usually higher than 900°C [48,49], in any case higher than 750-800°C [50], while the peak metamorphism temperature in upper HCS in this area is 570-690°C (samples N10 and N12 of Hodges et al [51]), suggesting that the zircon crystallization ages will be preserved.…”

Section: Results and Analysis Of Monazite-zircon U-th/pb Agesmentioning

confidence: 99%

“…This suggests that crystallization ages will be preserved during metamorphism [59,60]. The magmatic temperatures for the Himalaya leucogranites are likely no higher than ~650-750°C [61][62][63][64], meaning that the closure temperature is well above the crystallization temperature with limited diffusion of Pb in monazite and/or zircon [48,65,66] except huge fluid interactions. Compared to zircons, monazites are much less prone than zircons to yield inherited ages [52,56,67].…”

Section: Results and Analysis Of Monazite-zircon U-th/pb Agesmentioning

confidence: 99%

Ductile deformation within Upper Himalaya Crystalline Sequence and geological implications, in Nyalam area, Southern Tibet

Liu

Leloup

et al. 2012

Chin. Sci. Bull.

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The South Tibet Detachment System (STDS) is a flat normal fault that separates the Upper Himalaya Crystalline Sequence (UHCS) below from the Tethyan Sedimentary Sequence (TSS) above. Timing of deformations related to the STDS is critical to understand the mechanism and evolution of the Himalaya collision zone. The Nyalam detachment (ND) (~86°E) locates in the middle portion of STDS (81°-89°E). Dating of deformed leucocratic dykes that are most probably syntectonic at different depth beneath the ND, allow us to constrain the timing of deformation. (1) Dyke T11N37 located ~3500 m structurally below the ND emplaced at 27.4± 0.2 Ma; (2) Dyke T11N32 located ~1400 m structurally below the ND emplaced at 22.0±0.3 Ma; (3) T11N25 located within the top to the north STD shear zone, ~150 m structurally below the ND, emplaced at 17.1±0.2 Ma. Combining ND footwall cooling history and T11N25 deformation temperature, we indicate a probable onset of top to the north deformation at ~16 Ma at this location. These results show an upward younging of the probable timing of onset of the deformation at different structural distance below the ND. We then propose a new model for deformation migration below the ND with deformation starting by pure shear deformation at depth prior to ~27.5 Ma that migrates upward at a rate of ~ 0.3 mm/a until ~18 Ma when deformation switches to top to the north shearing in the South Tibet Detachment shear zone (STDsz). As deformation on the ND stops at 14-13 Ma this would imply that significant top to the North motion would be limited to less than 5 Ma and would jeopardize the importance of lower channel flow.

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Pb diffusion in zircon

Cited by 1,033 publications

References 52 publications

Zircon ages in granulite facies rocks: decoupling from geochemistry above 850 °C?

Zircon ages in granulite facies rocks: decoupling from geochemistry above 850 °C?

Provenance of Upper Miocene to Quaternary sediments in the Yinggehai-Song Hong Basin, South China Sea: Evidence from detrital zircon U–Pb ages

Ductile deformation within Upper Himalaya Crystalline Sequence and geological implications, in Nyalam area, Southern Tibet

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