Journal of Mineralogical and Petrological Sciences
Online ISSN : 1349-3825
Print ISSN : 1345-6296
ISSN-L : 1345-6296
ORIGINAL ARTICLES
CHIME monazite dating: Pb analysis on an RR = 100 mm spectrometer and correction of interferences between Th, U, and Pb with natural monazite
Mayuko SHIMIZUKenji SHIBATAKazuhiro SUZUKIShigeru SUEOKAMasakazu NIWA
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2017 Volume 112 Issue 2 Pages 88-96

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Abstract

This paper outlines an advanced procedure involving the chemical Th–U–total Pb isochron method (CHIME) dating of monazite using a field–emission electron probe microanalyzer (FE–EPMA) equipped with spectrometers of 100 mm Rowland circle (RR) radius. The higher count rate of RR = 100 mm wavelength dispersive spectrometer (WDS) compared to RR = 140 mm WDS enables measurements to be taken in a shorter time. CHIME dating using RR = 100 mm WDS had previously been difficult because of lower resolution compared to that of RR = 140 mm WDS. This problem has been overcome by a new interference correction method using natural monazites.

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© 2017 Japan Association of Mineralogical Sciences
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