NONDESTRUCTIVE CHEMICAL DATING OF YOUNG MONAZITE USING XRF 2. CONTEXT SENSITIVE MICROANALYSIS AND COMPARISON WITH TH-PB LASER-ABLATION MASS SPECTROMETRIC DATA
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dc.contributor.author | Scherrer N.C. | |
dc.contributor.author | Engi M. | |
dc.contributor.author | Berger A. | |
dc.contributor.author | Parrish R.R. | |
dc.contributor.author | Cheburkin A. | |
dc.date.accessioned | 2021-10-15T05:06:41Z | |
dc.date.available | 2021-10-15T05:06:41Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=27880320 | |
dc.identifier.citation | Chemical Geology, 2002, 191, 1-3, 243-255 | |
dc.identifier.issn | 0009-2541 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/30709 | |
dc.description.abstract | A newly developed XRF-microprobe at the Institute of Mineralogy and Petrology, University of Bern, Switzerland has been applied for precise chemical Th–U–Pb dating of individual monazite grains separated from Pb-free polished petrographic thin sections. The nondestructive nature of the XRF-measurement permitted a comparative study of dating methods by sequentially applying chemical dating by electron microprobe analysis (EMPA), chemical dating by XRF-microprobe analysis, and isotopic 208Pb/232Th dating by Laser Ablation Plasma Ionisation Multi-collector Mass Spectrometry (LA-PIMMS) analysis. As an example, the 2σ precision achieved with the XRF-microprobe for well characterised reference material, monazite FC-1 (TIMS age 54.3±1 Ma; μ-XRF age 55.3±2.6 Ma), doubly polished to 30 μm in thickness, is below 5% after 90 min integration time (50 kV; 30 mA) at a spatial resolution of 90 μm. At 38-μm spatial resolution, the uncertainty is 35% for the same integration time. The sample characteristics are 200–300 ppm of Pb (μ-XRF), 3.8–5.1 wt.% of Th (EMPA), and 0.4–1.4 wt.% U (EMPA). Combined with an electron microprobe and conventional optical microscopy, the XRF-microprobe is thus a competitive low-cost and nondestructive alternative to more costly isotopic methods. The XRF-microprobe is easy to use and maintain. | |
dc.title | NONDESTRUCTIVE CHEMICAL DATING OF YOUNG MONAZITE USING XRF 2. CONTEXT SENSITIVE MICROANALYSIS AND COMPARISON WITH TH-PB LASER-ABLATION MASS SPECTROMETRIC DATA | |
dc.type | Статья |
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