Datation de la monazite à la microsonde électronique  [Dating monazite using electron microprobe]

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Alternate Title:Dating monazite using electron microprobe
Authors:Montel, J. M.; Veschambre, M.; Nicollet, C.
Author Affiliations:Primary:
Univ. Blaise-Pascal, Clermont-Ferrand, France
Volume Title:Comptes Rendus de l'Académie des Sciences, Série II. Sciences de la Terre et des Planètes
Source:Comptes Rendus de l'Académie des Sciences, Série II. Sciences de la Terre et des Planètes, 318(11), p.1489-1495. Publisher: Gauthier-Villars, Montrouge, France. ISSN: 1251-8050
Publication Date:1994
Note:In French with English summary. 12 refs.; illus., incl. 1 table, anal.
Summary:Lead, uranium and thorium can be analysed with precision in monazite using EPMA. The concentrations can be interpreted directly as an age with a typical precision of ± 30 m.y. for a 3000 m.y. age and ± 100 m.y. for a 300 m.y. age. For samples of known age, the discrepancy between the microprobe age and the isotopic age is less than the errors. This method is an in situ dating technique, which can be used to date domains at the microscopic scale, with a spatial resolution of a few microns. The first results indicate that, as for zircon, monazite can display age heterogeneity, preserving old domains in a more recent crystal. [M.L.]
Subjects:Absolute age; Chemical analysis; Electron probe; Errors; Heterogeneity; In situ; Methods; Monazite; Phosphates; Precision; Spectroscopy; Th/U; U/Pb
Abstract Numbers:95M/5
Record ID:1995069507
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique
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