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

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