Xenotime at the Nanoscale: U-Pb Geochronology and Optimisation of Analyses by Atom Probe Tomography
Xenotime (YPO4) 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...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Language: | English |
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WILEY
2021
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| Subjects: | |
| Online Access: | http://purl.org/au-research/grants/arc/DE190101307 http://hdl.handle.net/20.500.11937/91630 |
| _version_ | 1848765563468251136 |
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| author | Joseph, C. Fougerouse, Denis Saxey, David Verberne, R. Reddy, Steven Rickard, William |
| author_facet | Joseph, C. Fougerouse, Denis Saxey, David Verberne, R. Reddy, Steven Rickard, William |
| author_sort | Joseph, C. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Xenotime (YPO4) 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 206Pb/238U and 207Pb/206Pb 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 206Pb/238U fractionation and 238UO22+/238UO2+ was used to correct for the atom probe instrument parameters variability between specimens. For 207Pb/206Pb ages, we employed two methods of background correction owing to the 206Pb2+ thermal tail contribution to the 207Pb2+ 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. |
| first_indexed | 2025-11-14T11:37:14Z |
| format | Journal Article |
| id | curtin-20.500.11937-91630 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:37:14Z |
| publishDate | 2021 |
| publisher | WILEY |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-916302023-05-17T07:58:34Z Xenotime at the Nanoscale: U-Pb Geochronology and Optimisation of Analyses by Atom Probe Tomography Joseph, C. Fougerouse, Denis Saxey, David Verberne, R. Reddy, Steven Rickard, William Science & Technology Physical Sciences Geochemistry & Geophysics atom probe tomography APT nanogeochronology Pb-206/U-238 Pb-207/Pb-206 radiometric dating AUTHIGENIC XENOTIME DIAGENETIC XENOTIME SEDIMENTARY-ROCKS FLUID-FLOW MONAZITE ZIRCON AUSTRALIA DEPOSIT AGES MASS Xenotime (YPO4) 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 206Pb/238U and 207Pb/206Pb 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 206Pb/238U fractionation and 238UO22+/238UO2+ was used to correct for the atom probe instrument parameters variability between specimens. For 207Pb/206Pb ages, we employed two methods of background correction owing to the 206Pb2+ thermal tail contribution to the 207Pb2+ 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. 2021 Journal Article http://hdl.handle.net/20.500.11937/91630 10.1111/ggr.12398 English http://purl.org/au-research/grants/arc/DE190101307 WILEY restricted |
| spellingShingle | Science & Technology Physical Sciences Geochemistry & Geophysics atom probe tomography APT nanogeochronology Pb-206/U-238 Pb-207/Pb-206 radiometric dating AUTHIGENIC XENOTIME DIAGENETIC XENOTIME SEDIMENTARY-ROCKS FLUID-FLOW MONAZITE ZIRCON AUSTRALIA DEPOSIT AGES MASS Joseph, C. Fougerouse, Denis Saxey, David Verberne, R. Reddy, Steven Rickard, William Xenotime at the Nanoscale: U-Pb Geochronology and Optimisation of Analyses by Atom Probe Tomography |
| title | Xenotime at the Nanoscale: U-Pb Geochronology and Optimisation of Analyses by Atom Probe Tomography |
| title_full | Xenotime at the Nanoscale: U-Pb Geochronology and Optimisation of Analyses by Atom Probe Tomography |
| title_fullStr | Xenotime at the Nanoscale: U-Pb Geochronology and Optimisation of Analyses by Atom Probe Tomography |
| title_full_unstemmed | Xenotime at the Nanoscale: U-Pb Geochronology and Optimisation of Analyses by Atom Probe Tomography |
| title_short | Xenotime at the Nanoscale: U-Pb Geochronology and Optimisation of Analyses by Atom Probe Tomography |
| title_sort | xenotime at the nanoscale: u-pb geochronology and optimisation of analyses by atom probe tomography |
| topic | Science & Technology Physical Sciences Geochemistry & Geophysics atom probe tomography APT nanogeochronology Pb-206/U-238 Pb-207/Pb-206 radiometric dating AUTHIGENIC XENOTIME DIAGENETIC XENOTIME SEDIMENTARY-ROCKS FLUID-FLOW MONAZITE ZIRCON AUSTRALIA DEPOSIT AGES MASS |
| url | http://purl.org/au-research/grants/arc/DE190101307 http://hdl.handle.net/20.500.11937/91630 |