Journal ArticleDOI
Improved laser ablation U‐Pb zircon geochronology through robust downhole fractionation correction
TLDR
In this paper, the authors proposed a data reduction approach to correct the effects of downhole elemental fractionation by first observing the elemental response and then applying an appropriate (and often unique) model to the data.Abstract:
Elemental fractionation effects during analysis are the most significant impediment to obtaining precise and accurate U-Pb ages by laser ablation ICPMS. Several methods have been proposed to minimize the degree of downhole fractionation, typically by rastering or limiting acquisition to relatively short intervals of time, but these compromise minimum target size or the temporal resolution of data. Alternatively, other methods have been developed which attempt to correct for the effects of downhole elemental fractionation. A common feature of all these techniques, however, is that they impose an expected model of elemental fractionation behavior; thus, any variance in actual fractionation response between laboratories, mineral types, or matrix types cannot be easily accommodated. Here we investigate an alternate approach that aims to reverse the problem by first observing the elemental fractionation response and then applying an appropriate (and often unique) model to the data. This approach has the versatility to treat data from any laboratory, regardless of the expression of downhole fractionation under any given set of analytical conditions. We demonstrate that the use of more complex models of elemental fractionation such as exponential curves and smoothed cubic splines can efficiently correct complex fractionation trends, allowing detection of spatial heterogeneities, while simultaneously maintaining data quality. We present a data reduction module for use with the lolite software package that implements this methodology and which may provide the means for simpler interlaboratory comparisons and, perhaps most importantly, enable the rapid reduction of large quantities of data with maximum feedback to the user at each stage. Copyright 2010 by the American Geophysical Union.read more
Citations
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Journal ArticleDOI
Iolite: Freeware for the visualisation and processing of mass spectrometric data
TL;DR: Iolite is a non-commercial software package developed to aid in the processing of inorganic mass spectrometric data, with a strong emphasis on visualisation versus time of acquisition, to provide a powerful framework for data processing and interpretation, while giving users the ability to implement their own data reduction protocols.
Journal ArticleDOI
VizualAge: A Novel Approach to Laser Ablation ICP‐MS U‐Pb Geochronology Data Reduction
Joseph A. Petrus,Balz S. Kamber +1 more
TL;DR: VizualAge as discussed by the authors is a new computer software tool for analysing U-Pb data obtained by laser ablation-inductively coupled plasma-mass spectrometry.
Journal ArticleDOI
Community‐Derived Standards for LA‐ICP‐MS U‐(Th‐)Pb Geochronology – Uncertainty Propagation, Age Interpretation and Data Reporting
Matthew S.A. Horstwood,Jan Košler,George E. Gehrels,Simon E. Jackson,Noah McLean,Chad Paton,Norman J. Pearson,Keith N. Sircombe,Paul J. Sylvester,Pieter Vermeesch,James F. Bowring,Daniel J. Condon,Blair Schoene +12 more
TL;DR: The LA-ICP-MS U-(Th-)Pb geochronology international community has defined new standards for the determination of U-(th)-Pb ages as discussed by the authors.
Journal ArticleDOI
U-Pb LA-ICPMS dating using accessory mineral standards with variable common Pb
TL;DR: In this paper, the authors present a general approach to common Pb correction in U-Pb LA-ICP-MS dating using a modified version of the VizualAge UcomPb data reduction package for Iolite.
Journal ArticleDOI
Laser-ablation split-stream ICP petrochronology
TL;DR: In this paper, a laser-ablation split-stream (LASS) analysis for petrochronology is presented, using dual multi-collector-single collector inductively-coupled plasma mass spectrometry.
References
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Journal ArticleDOI
Three natural zircon standards for u‐th‐pb, lu‐hf, trace element and ree analyses
M. Wiedenbeck,P. Allé,Fernando Corfu,William L. Griffin,M. Meier,F. Oberli,A. von Quadt,J.C. Roddick,W. Spiegel +8 more
TL;DR: In this paper, the results of a study to develop natural zircon geochemical standards for calibrating the U-(Th)-Pb geochronometer and Hf isotopic analyses are reported.
Journal ArticleDOI
The application of laser ablation-inductively coupled plasma-mass spectrometry to in situ U–Pb zircon geochronology
TL;DR: In this paper, a laser ablation-inductively coupled plasma-mass spectrometer (LA-ICP-MS) was used for in situ U-Pb zircon geochronology.
Journal ArticleDOI
Plesovice zircon : A new natural reference material for U-Pb and Hf isotopic microanalysis
Jirri Slama,Jirri Slama,Jirri Slama,Jan Košler,Daniel J. Condon,James L. Crowley,Axel Gerdes,John M. Hanchar,Matthew S.A. Horstwood,George A. Morris,Lutz Nasdala,Nicholas Norberg,Urs Schaltegger,Blair Schoene,Michael Tubrett,Martin J. Whitehouse +15 more
TL;DR: The Plesovice zircon as discussed by the authors has a concordant U-Pb age with a weighted mean Pb-206/U-238 date of 337.13 +/- 0.37 Ma (ID-TIMS, 95% confidence limits, including tracer calibration uncertainty).
Journal ArticleDOI
Precision Measurement of Half-Lives and Specific Activities of U 235 and U 238
TL;DR: New determinations of the half-lives of half-life values of $ −235 and −238 have been made improved techniques have allowed the halflife values to be measured with greater accuracy than has been heretofore achieved as discussed by the authors.
Journal ArticleDOI
Smoothing by spline functions. II
TL;DR: In this paper, the authors generalize the results of [4] and modify the algorithm presented there to obtain a better rate of convergence, which is the same as in this paper.