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dc.contributor.author
Huang, Hui-Qing
dc.contributor.author
Guillong, Marcel
dc.contributor.author
Hu, Yi
dc.contributor.author
Spandler, Carl
dc.date.accessioned
2021-04-20T10:27:18Z
dc.date.available
2021-04-20T03:21:44Z
dc.date.available
2021-04-20T10:27:18Z
dc.date.issued
2021-04-01
dc.identifier.issn
0267-9477
dc.identifier.issn
1364-5544
dc.identifier.other
10.1039/d1ja00044f
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/479428
dc.description.abstract
Several reference zircons, titanite, rutile and NIST 610 glass were analyzed to evaluate a previously underappreciated source of error in U–Pb isotope determination associated with laser focus. We show that a variation of >30 μm in laser focus can occur for both manual and automatic focusing during routine operation. Using two independent laboratories with different LA systems but using similar laser parameters (a laser fluence of 2 J cm−2, a circular spot of 20 μm, and a repetition rate of 4–5 Hz), we further demonstrate that the variation of laser focus by 30 μm can lead to a systematic shift in 206Pb/238U of <1% for NIST 610, ∼3% for titanite, 4–6% for zircon, and up to 12% for rutile. The impact of defocusing on U–Pb isotope determination does become weaker when the diameter to depth ratio increases. On the other hand, focus variation has a minimal impact on the fractionation between 206Pb and 207Pb, and as a result can cause false discordancy of data points in concordia plots. The error associated with laser focus can lead to increased uncertainty and poorer reproducibility in the determination of elements and isotopes. When the laser focus is accurate to within 5 μm, the influence of the focus offset is smaller than the analytical uncertainty and repeatability is enhanced particularly for high precision U–Pb isotope analysis by LA-ICP-MS.
en_US
dc.language.iso
en
en_US
dc.publisher
Royal Society of Chemistry
en_US
dc.title
Fine tuning laser focus for improved reproducibility of U–Pb isotope analysis by LA-ICP-MS
en_US
dc.type
Journal Article
dc.date.published
2021-03-15
ethz.journal.title
Journal of Analytical Atomic Spectrometry
ethz.journal.volume
36
en_US
ethz.journal.issue
4
en_US
ethz.journal.abbreviated
J Anal At Spectrom
ethz.pages.start
836
en_US
ethz.pages.end
844
en_US
ethz.identifier.scopus
ethz.publication.place
London
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03958 - Bachmann, Olivier / Bachmann, Olivier
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03958 - Bachmann, Olivier / Bachmann, Olivier
ethz.date.deposited
2021-04-20T03:21:48Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2021-04-20T10:27:40Z
ethz.rosetta.lastUpdated
2021-04-20T10:27:40Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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