Authors
Albrecht Von Quadt, Daniela Gallhofer, Marcel Guillong, Irena Peytcheva, Markus Waelle, Shuhei Sakata
Publication date
2014
Journal
Journal of Analytical Atomic Spectrometry
Volume
29
Issue
9
Pages
1618-1629
Publisher
Royal Society of Chemistry
Description
Chemical Abrasion Isotope-Dilution Thermal Ionization Mass Spectrometry (CA-ID-TIMS) is known as a high precision technique for resolving lead loss and improving the interpretation of U–Pb zircon age data. Here, we argue that combining CA with the widely applied Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS) improves the precision and accuracy of zircon dates, while removing the substantial parts with lead loss, reducing data scatter, and providing meaningful geological interpretations. The samples are magmatic rocks chosen from different geological time periods (one Paleozoic, one Mesozoic and three Cenozoic). All zircon separates are analysed by LA-ICP-MS before and after CA, and age data are compared with CA-ID-TIMS 206Pb/238U dates that are considered as the most accurately obtainable age. All CA-treated zircon crystals show up to 50% less data scatter …
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