U pb dating of zircon by la icp ms. U-Pb dating of zircon by LA-ICP-MS.



U pb dating of zircon by la icp ms

U pb dating of zircon by la icp ms

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Lecture 15 U Th Pb 1



U pb dating of zircon by la icp ms

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U pb dating of zircon by la icp ms

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  1. Due to unresolved contributions to uncertainty from the lack of a common Pb correction and from potential matrix effects between standards and unknowns, however, this estimate cannot be universally applied to all unknowns.

  2. Static fractionation, due to instrumental discrimination and caused during laser ablation, was corrected using external zircon standards. A detailed systematic approach for determining optimal ablation settings and ICP-MS parameters is presented, which is also applicable to other instrument set-ups. Total uncertainty for each analysis of an unknown is estimated from both the uncertainty in the measured isotope ratios and the variance in the standard measurements.

  3. This included the construction of a low-volume sample cell and the establishment of a data reduction routine. Do you want to read the rest of this article? Sign in Don't already have an account?

  4. These are combined quadratically for single results such as detrital zircon analyses. Laser-induced time-dependent fractionation is corrected by normalizing measured ratios in both standards and samples to the beginning of the analysis using the intercept method. Total uncertainty for each laser analysis of an unknown is combined quadratically from the uncertainty in the measured isotope ratios of the unknown and the uncertainty in the fractionation factors calculated from the measurement of standards.

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