Impact-triggered nanoscale Pb clustering and Pb loss domains in Archean zircon

Arcuri, G.; Moser, D. E.; Reinhard, David A.; Langelier, Brian; Larson, David J.

doi:10.1007/s00410-020-01698-w

Cited by 17 publications

(8 citation statements)

References 47 publications

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“…Atom probe tomography (APT) is also used to investigate Pb in zircon at the atomic scale (Valley et al, 2014(Valley et al, , 2015Peterman et al, 2016;Piazolo et al, 2016;Arcuri et al, 2020), however, 'atomic Pb clusters' widely defined by APT are relatively small in terms of Pb concentration, typically comprising no more than a few thousand Pb atoms, and are thus distinct from M-PbNs.…”

Section: Introductionmentioning

confidence: 99%

“…Metallic-Pb nanospheres have, to date, only been characterised using transmission electron microscopy (TEM) and are estimated to contain in excess of 139,000 Pb atoms within a ~20 nm diameter nanosphere (Kusiak et al , 2017). Investigations of Pb in zircon at the atomic scale using atom probe tomography (Valley et al , 2014, 2015; Piazolo et al , 2016; Peterman et al ., 2019; Arcuri et al , 2020), describes ‘atomic Pb clusters’, however these are relatively small in terms of Pb concentration, typically comprising no more than a few thousand Pb atoms, and are thus distinct from metallic-Pb nanospheres.…”

Section: Introductionmentioning

confidence: 99%

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Metallic-Pb nanospheres in zircon from the Challenger Au deposit, South Australia: probing metamorphic and ore formation histories

Courtney‐Davies

Ciobanu

Cook

et al. 2021

MinMag

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Ancient metamorphic processes are recorded by the formation of metallic-Pb nanospheres in zircon, a product of internal Pb mobilisation and thermally driven concentration. Here, metallic-Pb nanospheres formed within an ore deposit are characterised for the first time using high-angle annular dark field scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy element-distribution mapping. Exceptional examples from the migmatite-hosted Archean–Paleoproterozoic Challenger Au deposit (Central Gawler Craton, South Australia) support widespread metallic-Pb nanosphere formation in zircon from rocks experiencing granulite-facies metamorphism. We also report new trace-element associations found with metallic-Pb nanospheres and a new mode of occurrence, in which Sc ‘haloes’ form adjacent to metallic-Pb nanospheres within the crystalline zircon lattice. This differs to previously characterised examples of metallic-Pb nanospheres associated with amorphous Si-rich glasses and unidentified Al–Ti, or Fe-bearing phases. Multiple modes of metallic-Pb nanosphere occurrences and trace-element associations suggests multiple modes of formation, probably dependant on zircon composition and metamorphic conditions. Identification of metallic-Pb nanospheres in a growing range of geological settings further highlights the mobility of Pb in zircon and the importance of detailed, nanoscale mineral characterisation, in order to constrain accurate geochronological histories for rocks within high-temperature geological environments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Metallic-Pb nanospheres in zircon from the Challenger Au deposit, South Australia: probing metamorphic and ore formation histories

Courtney‐Davies

Ciobanu

Cook

et al. 2021

MinMag

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“…The analytical volume of APT is < 0.008 μm 3 , which is four to six orders of magnitude smaller than other isotopic capable techniques (Fougerouse et al 2020a). Nanogeochronology by APT has been successfully applied to several accessory phases including zircon using 207 Pb/ 206 Pb or 206 Pb/ 238 U systems (Valley et al 2014, Peterman et al 2016, Arcuri et al 2020, baddeleyite with the 206 Pb/ 238 U or 208 Pb/ 232 Th systems (White et al 2017(White et al , 2019 and monazite using the 208 Pb/ 232 Th system (Fougerouse et al 2020a,b).…”

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confidence: 99%

“…2016, Arcuri et al . 2020), baddeleyite with the 206 Pb/ 238 U or 208 Pb/ 232 Th systems (White et al . 2017, 2019) and monazite using the 208 Pb/ 232 Th system (Fougerouse et al .…”

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confidence: 99%

“…Considerable research has been done on the spectral analysis of Pb isotopes on zircon and baddeleyite using APT (Blum et al 2017, Saxey et al 2017. 207 Pb/ 206 Pb ages from nanoscale domains and clusters have been used to derive critical information on geological history using zircons (Valley et al 2014, Peterman et al 2016, Piazolo et al 2016, Arcuri et al 2020, baddeleyite (White et al 2017(White et al , 2019 and pyrite (Fougerouse et al 2019).…”

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confidence: 99%

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Xenotime at the Nanoscale: U‐Pb Geochronology and Optimisation of Analyses by Atom Probe Tomography

Joseph

Fougerouse

Saxey

et al. 2021

Geostandard Geoanalytic Res

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Xenotime (YPO 4 ) is an accessory phase common in low to high-temperature geological environments. Xenotime is an established geochronometer, though its small size, low modal abundance and textural complexity make it more difficult to analyse with traditional techniques but makes a prime candidate for nanoscale analysis. In this study, we develop an atom probe tomography (APT) protocol to determine the 206 Pb/ 238 U and 207 Pb/ 206 Pb ages of micro-scale xenotime crystals with analytical volumes four to six orders of magnitude smaller than typical geochronology techniques. A linear correlation between the 206 Pb/ 238 U fractionation and 238 UO 2 2+ / 238 UO 2+ was used to correct for the atom probe instrument parameters variability between specimens. For 207 Pb/ 206 Pb ages, we employed two methods of background correction owing to the 206 Pb 2+ thermal tail contribution to the 207 Pb 2+ counts: A constant background correction for the younger (~1000 Ma) Y1 reference material and a variable correction of background for Archaean age reference material xtc to correct for the thermal tail influence. This contribution also proposes strategies for optimisation of xenotime analysis using APT and permits us to explore the various geological problems in the nanoscale realm. This methodology potentially allows determining the age of small xenotime crystals in sedimentary rocks, low metamorphic grade settings and deformation microstructures.

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Petrochronology: Micron-scale links between mineral dates, P – T conditions, and petrogenesis

Smye,

Garber

2023

Reference Module in Earth Systems and Environmental Sciences

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Impact-triggered nanoscale Pb clustering and Pb loss domains in Archean zircon

Cited by 17 publications

References 47 publications

Metallic-Pb nanospheres in zircon from the Challenger Au deposit, South Australia: probing metamorphic and ore formation histories

Metallic-Pb nanospheres in zircon from the Challenger Au deposit, South Australia: probing metamorphic and ore formation histories

Xenotime at the Nanoscale: U‐Pb Geochronology and Optimisation of Analyses by Atom Probe Tomography

Petrochronology: Micron-scale links between mineral dates, P – T conditions, and petrogenesis

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