I am hoping to obtain some reliably dated (i.e. by TIMS) and preferably old
xenotime and garnet (ugrandite) to use as reference materials for U-Pb
geochronology by LA-MC-ICP-MS.
I have a good inventory of U-Pb RMs for many other minerals and would be
happy to share some of what we have in exchange. Don't hesitate if the
potential RMs is/may be heterogeneous on some scale, I don't mind doing a
fairly thorough characterization of that by BSE imaging and targeted
in-situ analyses, and potentially collaborate on a RM publication in the
For the xenotime: Paleoproterozoic and older (ideally Archean) specimens
are needed. Small grains are ok, as we commonly use a ~10 um spots size.
For the garnet: Older is better as well, but anything with a good TIMS
age on it (that's not actually dating the zircon/monazite inclusions) will
be of use. These grains would need to be >50 um, but that shouldn't be too
much of a problem for Grt.
Thanks in advance and apologies for cross postings.
Jeffrey H. Marsh
Research Associate & Director MERC Isotope Geochemistry Laboratory
Metal Earth, Mineral Exploration Research Centre (MERC), Laurentian
935 Ramsey Lake Rd, WGMC 8th Floor, Sudbury, ON P3E 2C6
T: 705.675.1151 <(705)%20675-1151> l F: 705-671-3855 <(705)%20671-3855> l
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