Wu,C.(2008): Bayan Obo controversy: Carbonatites versus iron oxide-Cu-Au-(REE-U). Resource Geology, 58(4), 348-354.

『バイユゥィンオボ論争:カーボナタイトあるいは鉄酸化物−銅−金−(希土類−ウラン)』


Abstract
 The Bayan Obo Fe-REE-Nb deposits is the world's largest rare earth element (REE) resource and its genesis has been the subject of much debate for many years. The most popular are the carbonatite-related and hydrothermal Fe oxide-Cu-Au-(REE-U) genetic models. Comparisons of geologic setting, lithology, mineral assemblages, metal associations, geochemistry (particularly REE and light REE/heavy REE ratios), fluid chemistry and isotopics indicate that the Bayan Obo deposit shares features of both types, which are classified differently; that is, the carbonatites model is host-rock based, while the Fe oxide-Cu-Au-(REE-U) model is essentially mineral assemblage and metal association based. A speculative classification scheme is tentatively put forward to link the two models, but many questions remain for further studies.

Keywords: Bayan-Obo; carbonatites; iron oxide Cu-Au; ore genesis; rare earths』

1. Introduction
2. Comparison with carbonatite deposits
3. Comparison with Fe-oxide-Cu-Au-(REE-U) family deposits
4. Speculative classification model
Acknowledgments
References



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