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Mineralogical Magazine; August 2004; v. 68; no. 4; p. 669-675; DOI: 10.1180/0026461046840211
© 2004 Mineralogical Society of Great Britain and Ireland
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Discussion on Wang et al. (2000) ‘Chemistry of Hf-rich zircons from the Laoshan I- and A-type granites, Eastern China’, Mineralogical Magazine, 64, 867–877

U. Kempe1, T. Gruner1, A. D. Renno1, D. Wolf1 and M. René2

1 Institute of Mineralogy, Freiberg University of Mining and Technology, Brennhausgasse 14, 09596 Freiberg, Germany
2 Institute of Rock Structure and Mechanics, Academy of Sciences of Czech Republic, V Holesovickách 41, 18209 Prague 8, Czech Republic

* E-mail: kempe{at}mineral.tu-freiberg.de

Wang et al. (2000) presented interesting new data on the occurrence of Hf-rich zircon in peralkaline granitic rocks. It is shown that the knowledge of the Hf distribution in zircon is important for the understanding of Zr/Hf ratios defined by whole-rock analysis. However, the processes leading to the unusual Zr/Hf fractionation are still poorly constrained. Some aspects are discussed further here. Analysis of available data demonstrates that extremely low Zr/Hf ratios found in topaz- and rare-metal bearing granites may be either a primary signature of some evolved granitic melts or, alternatively, they are produced during albitization of the rocks. Topaz- and rare-metal bearing granites may be P-rich and contain zircon moderately enriched in Hf (2–9 wt.% HfO2). Another group is P-poor and the Hf content in accessory zircon is high (up to 35 wt.% HfO2). Both types of intrusions may occur within a single orogen as demonstrated by the example of the Hercynian magmatism in the Erzgebirge/Krusné hory region (Germany/Czech Republic).

KEYWORDS: hafnium, zircon, Laoshan, China




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