Product catalogue
SHRIMP U–Pb–Th xenotime (YPO4) geochronology: a novel approach for the correction of SIMS matrix effects
Xenotime (YPO4) occurs in a wide range of geological environments, but its potential to establish the timing of mineralisation and sediment diagenesis has been the focus of most recent studies. Xenotime in these settings usually has a low uranium content (typically < 1000 ppm) and occurs as microscopic crystals (< 20 μm diameter), either individually or as outgrowths on a zircon substrate. Large radius ion microprobes, such as the SHRIMP or Cameca 1270/1280, that have high sensitivity and spatial resolution, are well suited for the U–Pb–Th analysis of xenotime from such environments. SIMS U–Pb–Th analyses of xenotime, however, are prone to significant U–Pb–Th matrix effects (ME) that are related to the wide natural range of U (0–6 wt%) and rare earth element (REE) (ΣREE: 12–22 wt%) concentrations in this mineral. For SHRIMP U–Pb–Th xenotime analyses, a 1 wt% increase in U concentration, relative to the U–Pb–Th calibration reference material (RM), will on average cause a corresponding increase in the measured 206Pb/238U and 208Pb/232Th of approximately 15% and 14% respectively. Similarly, a 1 wt% contrast in ΣREE causes an increase of about 1.2% in 206Pb/238U and about 1.7% in 208Pb/232Th. Correction for these chemically-induced matrix effects requires the concurrent analysis of three xenotime reference materials (RMs) which have known ages and a range of U and ΣREE contents that have been determined accurately by electron probe microanalysis (EPMA). A least squares methodology is used to derive correction coefficients that relate the SHRIMP U–Pb–Th ME to the U and ΣREE concentrations for the RMs. Crucial to the success of this technique is the use of one dimensional (1-D) calibrations using 206Pb+/270[UO2]+ and 208Pb+/248[ThO]+. Processing is carried out in two steps: the first derives the correction coefficients to matrix correct the 206Pb+/270[UO2]+ and 208Pb+/248[ThO]+ ratios, the second processes the matrix corrected ratios to determine 206Pb/238U and 208Pb/232Th.
<b>Citation:</b> A.J. Cross, I.S. Williams, SHRIMP U–Pb–Th xenotime (YPO4) geochronology: A novel approach for the correction of SIMS matrix effects, <i>Chemical Geology</i>, Volume 484, 2018, Pages 81-108, ISSN 0009-2541,
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- Date (Creation)
- 2017-05-19T15:50:00
- Date (Publication)
- 2023-10-23T22:36:56
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/110588
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- Codespace
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Digital Object Identifier
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Role Organisation / Individual Name Details Author Cross, A.
MEG Internal Contact Author Williams, I.S.
External Contact Publisher Elsevier B.V.
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Chemical Geology
- Issue identification
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Volume 484, 5 May 2018
- Page
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81-108
- Purpose
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Article written for submission to Chemical Geology Journal
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- Completed
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Cross, A.
MEG Internal Contact Resource provider Minerals, Energy and Groundwater Division
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Product data repository: Various Formats
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EARTH SCIENCES
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- Keywords
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Geochronology
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- Keywords
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secondary ion mass spectrometry - SIMS
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- Keywords
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sensitive high resolution ion microprobe - SHRIMP
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- Keywords
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Xenotime
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- Keywords
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U-Pb-Th matrix effects
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- Keywords
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Published_External
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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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Crown Copyright © 2018
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- English
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
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Article written for submission to Chemical Geology Journal
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urn:uuid/d7b47b24-2130-4a18-b0a7-528ef45ef21e
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GeoNetwork UUID
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Owner Cross, A.
MEG Internal Contact Point of contact Cross, A.
MEG Internal Contact
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- Document
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Journal Articles and Conference Papers
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Geoscience Australia - short identifier for metadata record with
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https://internal.ecat.ga.gov.au/geonetwork/srv/eng/search?uuid=d7b47b24-2130-4a18-b0a7-528ef45ef21e
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- Date info (Creation)
- 2017-05-19T05:43:27
- Date info (Revision)
- 2017-05-19T05:53:04
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
- Edition date
- 2015-07-01T00:00:00
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
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Version 2.0, April 2015