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The Bayan Obo mine in North China contains the largest rare-earth element (REE) resources in the world. The mechanism of giant REE enrichment in such a restricted region has been the focus of several studies. Carbonatites are known to contain high concentrations of REE. Three types of carbonatite dykes occur around the Bayan Obo deposit, including dolomite, calcite and calcite-dolomite carbonatite...
The North China Craton (NCC) has figured prominently in recent reconstructions on the Paleoproterozoic supercontinent Columbia. Here we report abundant carbonatitic and mafic dykes from around the giant Bayan Obo rare earth element deposit in the northern margin of the NCC, and present geochemical and isotope geochronological data. The carbonatite (1354±59Ma) and mafic dykes (1227±60Ma) have comparable...
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