Monazite reference materials and their U-Pb ages

This table summaries monazite reference materials commonly used in geochronology, listed in order of their age. Some of these materials have been reported to contain modest but significant levels of Pb-loss. Prior to considering the use of any of these materials for quality control purposes, it is strongly recommended that analysts carefully review the cited publications as well as other reports that may exist in the scientific literature. Compilations of zircon, titanite/sphene and apatite reference materials are also available.

Name Age (Ma) Reference Initial amount Available grain size* U conc (µg/g) Th conc (µg/g)
HSA47 1842 1d n/r   4700 n/r
RW-1 904 2d 44 g 300 µm ca. 3000 ca. 135,000
Manangoutry 553 1d n/r   894 n/r
Moacyr 511.2 3d n/r   878-1070 70,000
Diamantina 495.26 4d 2 crystals chips 53-400 ca. 3600
K00-63 446 5d, 6d 22 grains   ca. 7000 ca. 40,000
44069 424.9 7d <outcr> depleted 1684-4099 24,000-42,000
Trebilcock 280 8d multiple crystals depleted ca. 6300 ca. 2000
Amelia 274.29 6d, 9d 1 crystal   ca. 4000 120,000
RP1 64.4 1d n/r   2139 n/r
FC1 55.7 1d n/r   11,800 n/r
554 ca. 50 9d, 10d n/r   130 38,000
n/r = not reported
*only reported where the material is described as intended for distribution
<outcr> = multi-grain material from outcrop

References

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6d. Kohn and Vervoort (2008). Geochemistry, Geophysics, Geosystems, 9/4
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8d. Tomascak at al. (1996). Journal of Geology, 104, 185-195
9d. Peterman et al. (2012). Chemical Geology, 312-313, 58–73
10d. Harrison et al. (1999). Journal of Petrology, 40, 3-19