Back to Search
Start Over
Accuracy of LA-ICPMS zircon U-Pb age determination: An inter-laboratory comparison.
- Source :
-
SCIENCE CHINA Earth Sciences . Oct2015, Vol. 58 Issue 10, p1722-1730. 9p. - Publication Year :
- 2015
-
Abstract
- LA-ICPMS zircon U-Pb dating has been greatly advanced and widely applied in the past decade because it is a cheap and fast technique. The internal error of LA-ICPMS zircon U-Pb dating can be better than 1%, but reproducibility (accuracy) is relatively poor. In in order to quantitatively assess the accuracy of this technique, zircons from two dioritic rocks, a Mesozoic dioritic microgranular enclave (FS06) and a Neoproterozoic diorite (WC09-32), were dated independently in eight laboratories using SIMS and LA-ICPMS. Results of three SIMS analyses on FS06 and WC09-2 are indistinguishable within error and give a best estimate of the crystallization age of 132.2 and 760.5 Ma (reproducibility is ∼1%, 2RSD), respectively. Zircon U-Pb ages determined by LA-ICPMS in six laboratories vary from 128.3±1.0 to 135.0±0.9 Ma (2SE) for FS06 and from 742.9±3.1 to 777.8±4.7 Ma (2SE) for WC09-32, suggesting a reproducibility of ∼4% (2RSD). Uncertainty produced during LA-ICPMS zircon U-Pb analyses comes from multiple sources, including uncertainty in the isotopic ratio measurements, uncertainty in the fractionation factor calculation using an external standard, uncertainty in the age determination as a result of common lead correction, age uncertainty of the external standards and uncertainty in the data reduction. Result of our study suggests that the uncertainty of LA-ICPMS zircon U-Pb dating is approximately 4% (2RSD). The uncertainty in age determination must be considered in order to interpret LA-ICPMS zircon U-Pb data rationally. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 16747313
- Volume :
- 58
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- SCIENCE CHINA Earth Sciences
- Publication Type :
- Academic Journal
- Accession number :
- 110119944
- Full Text :
- https://doi.org/10.1007/s11430-015-5110-x