Articles | Volume 6, issue 3
https://doi.org/10.5194/gchron-6-337-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-6-337-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
10 Jul 2024
Research article |
| 10 Jul 2024
| 10 Jul 2024
Effect of chemical abrasion of zircon on SIMS U–Pb, δ18O, trace element, and LA-ICPMS trace element and Lu–Hf isotopic analyses
Cate Kooymans
Geoscience Australia, Symonston, ACT 2609, Australia
Charles W. Magee Jr.
CORRESPONDING AUTHOR
Geoscience Australia, Symonston, ACT 2609, Australia
Kathryn Waltenberg
Geoscience Australia, Symonston, ACT 2609, Australia
Noreen J. Evans
John de Laeter Centre, Curtin University, Bentley WA 6102, Australia
Simon Bodorkos
Geoscience Australia, Symonston, ACT 2609, Australia
Yuri Amelin
Research School of Earth Sciences, Australian National University, Canberra, ACT 2600, Australia
Korea Basic Science Institute, Ochang, Cheongju, Chungbuk 28119, South Korea
Sandra L. Kamo
Department of Earth Sciences, University of Toronto, Toronto, Ontario M5S 3B1, Canada
Trevor Ireland
Research School of Earth Sciences, Australian National University, Canberra, ACT 2600, Australia
School of the Environment, Steele Building, 3 Staff House Road, University of Queensland, St Lucia QLD 4072, Australia
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Charles W. Magee Jr., Lutz Nasdala, Renelle Dubosq, Baptiste Gault, and Simon Bodorkos
Geochronology, 7, 591–602, https://doi.org/10.5194/gchron-7-591-2025, https://doi.org/10.5194/gchron-7-591-2025, 2025
Short summary
Short summary
Chemical abrasion (CA) is a two-step method for reducing Pb loss where zircon is annealed then partially dissolved. We use secondary ion mass spectrometry (SIMS) to find closed- and open-system zircon domains in zircon that has been chemically abraded, annealed only, or untreated. Raman mapping identifies lattice damage in SIMS spots. Atom probe tomography (APT) results from both the discordant spots and the concordant ones are all homogeneous and identical. Thus, APT cannot distinguish discordant and concordant zircon.
Walid Naciri, Arnoud Boom, Matthew Payne, Nicola Browne, Noreen J. Evans, Philip Holdship, Kai Rankenburg, Ramasamy Nagarajan, Bradley J. McDonald, Jennifer McIlwain, and Jens Zinke
Biogeosciences, 20, 1587–1604, https://doi.org/10.5194/bg-20-1587-2023, https://doi.org/10.5194/bg-20-1587-2023, 2023
Short summary
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In this study, we tested the ability of massive boulder-like corals to act as archives of land use in Malaysian Borneo to palliate the lack of accurate instrumental data on deforestation before the 1980s. We used mass spectrometry to measure trace element ratios in coral cores to use as a proxy for sediment in river discharge. Results showed an extremely similar increase between our proxy and the river discharge instrumental record, demonstrating the use of these corals as reliable archives.
Charles W. Magee Jr., Simon Bodorkos, Christopher J. Lewis, James L. Crowley, Corey J. Wall, and Richard M. Friedman
Geochronology, 5, 1–19, https://doi.org/10.5194/gchron-5-1-2023, https://doi.org/10.5194/gchron-5-1-2023, 2023
Short summary
Short summary
SHRIMP (Sensitive High Resolution Ion MicroProbe) is an instrument that for decades has used the radioactive decay of uranium into lead to measure geologic time. The accuracy and precision of this instrument has not been seriously reviewed in almost 20 years. This paper compares several dozen SHRIMP ages in our database with more accurate and precise methods to assess SHRIMP accuracy and precision. Analytical and geological complications are addressed to try to improve the method.
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Short summary
Zircon is a mineral where uranium decays to lead. Some radiation damage lets lead escape. A method called chemical abrasion (CA) dissolves out the damaged portions of zircon so that remaining zircon retains lead. We compare ion beam analyses of untreated and chemically abraded zircons. The ion beam ages for untreated zircons match the reference values for untreated zircon. The ion beam ages for CA zircon match CA reference ages. Other elements are unaffected by the chemical abrasion process.
Zircon is a mineral where uranium decays to lead. Some radiation damage lets lead escape. A...
