Short communicationComment: Hf-isotope heterogeneity in zircon 91500
Section snippets
Comment
Fragments of the Canadian zircon crystal known as Harvard 91500 (Wiedenbeck et al., 1995) have been widely distributed for use as a U–Pb and Hf-isotope reference material, with about 110 g having been available. Despite this wide distribution and relative abundance, many laboratories have access to relatively small volumes, often a few chips. Ideally, a reference material should be isotopically homogeneous, and such homogeneity has been either implicitly assumed or tested on limited material by
Acknowledgements
Hf-isotope analyses have been supported by ARC Discovery grants (S.Y. O'Reilly and W.L. Griffin), an ARC APD fellowship (EAB) and several industry-sponsored collaborative research projects (Anglo Australia, BHPB, WMC, DeBeers). We thank E. Beyer and a host of students for contributing data. Comments from an anonymous referee improved the MS. This is contribution 428 from the ARC National Key Centre for Geochemical Evolution and Metallogeny of Continents (www.es.mq.edu.au/GEMOC).[PD]
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