Nondestructive chemical dating of young monazite using XRF. 2. Context sensitive microanalysis and comparison with Th-Pb laser-ablation mass spectrometric data

Scherrer, Nadim; Engi, Martin; Berger, Alfons; Parrish, Randall R.; Cheburkin, Andriy (2002). Nondestructive chemical dating of young monazite using XRF. 2. Context sensitive microanalysis and comparison with Th-Pb laser-ablation mass spectrometric data Chemical Geology, 191(1-3), pp. 243-255. Elsevier 10.1016/S0009-2541(02)00159-6

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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 Pb-208/Th-232 dating by Laser Ablation Plasma Ionisation Multi-collector Mass Spectrometry (LA-PIMMS) analysis. As an example, the 2sigma precision achieved with the XRF-microprobe for well characterised reference material, monazite FC-1 (TIMS age 54.3 +/- 1 Ma; mu-XRF age 55.3 +/- 2.6 Ma), doubly polished to 30 mum in thickness, is below 5% after 90 min integration time (50 kV; 30 mA) at a spatial resolution of 90 mum. At 38-mum, spatial resolution, the uncertainty is 35% for the same integration time. The sample characteristics are 200-300 ppm of Pb (mu-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. (C) 2002 Elsevier Science B.V All rights reserved.

Item Type:

Journal Article (Original Article)

Division/Institute:

Bern Academy of the Arts
Bern Academy of the Arts > Institute Materiality in Art and Culture

Name:

Scherrer, Nadim0000-0002-6576-885X;
Engi, Martin;
Berger, Alfons;
Parrish, Randall R. and
Cheburkin, Andriy

Subjects:

Q Science > QE Geology

ISSN:

0009-2541

Publisher:

Elsevier

Language:

English

Submitter:

Nadim Scherrer

Date Deposited:

09 Feb 2021 16:00

Last Modified:

20 Apr 2021 14:41

Publisher DOI:

10.1016/S0009-2541(02)00159-6

Related URLs:

Web of Science ID:

000179511500015

Additional Information:

Notes: 620AW Times Cited:10 Cited References Count:22 Date: 2002

Uncontrolled Keywords:

monazite EMPA XRF-microprobe LA-PIMMS Th-U-Pb dating u-pb electron-microprobe age data metamorphism geochronology evolution petrology allanite xenotime gneiss

ARBOR DOI:

10.24451/arbor.13532

URI:

https://arbor.bfh.ch/id/eprint/13532

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