Product catalogue
Effect of chemical abrasion of zircon on SHRIMP U-Pb, d180O, Trace element, and LAICPMS trace element and Lu Hf isotopic analyses
This study assesses the effect of chemical abrasion on in-situ mass spectrometric isotopic and elemental analyses in zircon. Chemical abrasion improves the U-Pb systematics of SIMS (Secondary Ion Mass Spectrometry) analyses of reference zircons, while leaving other isotopic systems largely unchanged. SIMS <sup>206</sup>Pb/<sup>238</sup>U ages of chemically abraded reference materials TEMORA-2, 91500, QGNG, and OG1 are precise to within 0.25 to 0.4%, and are within uncertainty of chemically abraded TIMS reference ages, while SIMS <sup>206</sup>Pb/<sup>238</sup>U ages of untreated zircons are within uncertainty of TIMS reference ages where chemical abrasion was not used. Chemically abraded and untreated zircons appear to cross-calibrate within uncertainty using all but one possible permutations of reference materials, provided that the corresponding chemically abraded or untreated reference age is used for the appropriate material. In the case of reference zircons QGNG and OG1, which are slightly discordant, the SIMS U-Pb ages of chemically abraded and untreated material differ beyond their respective 95% confidence intervals.
SIMS U-Pb analysis of chemically abraded zircon with multiple growth stages are more difficult to interpret. Treated igneous rims on zircon crystals from the S-type Mount Painter Volcanics are much lower in common Pb than the rims on untreated zircon grains. However, the analyses of chemically abraded material show excess scatter. Chemical abrasion also changes the relative abundance of the ages of zircon cores inherited from the sedimentary protolith, presumably due to some populations being more likely to survive the chemical abrasion process than others. We consider these results from inherited S-type zircon cores to be indicative of results for detrital zircon grains from unmelted sediments.
Trace element, δ<sup>18</sup>O, and εHf analyses were also performed on these zircons. None of these systems showed substantial changes as a result of chemical abrasion. The most discordant reference material, OG1, showed a loss of OH as a result of chemical abrasion, presumably due to dissolution of hydrous metamict domains, or thermal dehydration during the annealing step of chemical abrasion. In no case did zircon gain fluorine due to exchange of lattice-bound substituted OH or other anions with fluorine during the HF partial dissolution phase of the chemical abrasion process. As the OG1, QGNG, and TEMORA-2 zircon samples are known to be compositionally inhomogenous in trace element composition, spot-to-spot differences dominated the trace element results. Even the 91500 megacrystic zircon pieces exhibited substantial chip-to-chip variation. The LREE in chemically abraded OG1 and TEMORA-2 were lower than in the untreated samples. Ti concentration and phosphorus saturation ((Y+REE)/P) were generally unchanged in all samples.
<b>Citation:</b> Kooymans, C., Magee Jr., C. W., Waltenberg, K., Evans, N. J., Bodorkos, S., Amelin, Y., Kamo, S. L., and Ireland, T.: Effect of chemical abrasion of zircon on SIMS U–Pb, δ<sup>18</sup>O, trace element, and LA-ICPMS trace element and Lu–Hf isotopic analyses, Geochronology, 6, 337–363, https://doi.org/10.5194/gchron-6-337-2024, 2024.
Simple
Identification info
- Date (Creation)
- 2023-10-18T18:00:00
- Date (Publication)
- 2024-08-20T02:41:51
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/148980
- Cited responsible party
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Role Organisation / Individual Name Details Publisher Commonwealth of Australia (Geoscience Australia)
Voice Author Kooymans, C.
Internal Contact Author Magee, C.
Internal Contact Author Waltenberg, K.
Internal Contact Author Evans, N.
Internal Contact Author Bodorkos, S.
Internal Contact Author Amelin, Y
External Contact Author Kamo, S. L.
External Contact Author Ireland, T. R.
External Contact Publisher Copernicus Publications on behalf of the European Geosciences Union
External Contact
- Name
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Geochronology
- Issue identification
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Volume 6, issue 3, 2024
- Page
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337–363
- Purpose
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Documents improvements in SHRIMP geochronological analyses of zircon
- Status
- Completed
- Point of contact
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Role Organisation / Individual Name Details Resource provider Minerals, Energy and Groundwater Division
External Contact Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Magee, C.
Internal Contact
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- Topic category
-
- Geoscientific information
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))
- Maintenance and update frequency
- As needed
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Product data repository: Various Formats
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Data Store directory containing the digital product files
Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes
- Project
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Chemical Abrasion
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- Project
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Lu-Hf
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- Project
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d18O
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- Keywords
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SHRIMP
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- Keywords
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U-Pb geochronology
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- Keywords
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zircon
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- theme.ANZRC Fields of Research.rdf
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Isotope Geochemistry
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- Keywords
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Published_External
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Resource constraints
- Title
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Creative Commons Attribution 4.0 International Licence
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CC-BY
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4.0
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Role Organisation / Individual Name Details User Any
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©Author(s) 2024.
Resource constraints
- Title
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Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
- Classification system
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Australian Government Security Classification System
- Language
- English
- Character encoding
- UTF8
Distribution Information
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
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- OnLine resource
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Link to Journal
Link to Journal
- Distribution format
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- Statement
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<div>This is a novel research paper to be published in the EGU Geochronology journal</div>
Metadata constraints
- Title
-
Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Metadata
- Metadata identifier
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urn:uuid/61cb8fd0-9e27-4612-a903-00de6cae2a2c
- Title
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GeoNetwork UUID
- Language
- English
- Character encoding
- UTF8
- Contact
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Magee, C.
Internal Contact
Type of resource
- Resource scope
- Document
- Name
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Journal Article / Conference Paper
Alternative metadata reference
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/148980
- Date info (Creation)
- 2024-08-20T02:22:48
- Date info (Revision)
- 2024-08-20T02:22:48
Metadata standard
- Title
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AU/NZS ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-3
- Title
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
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Version 2.0, September 2018
- Citation identifier
- http://pid.geoscience.gov.au/dataset/ga/122551