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Bayan Obo, located at the northern margin of the North China Craton (Fig.1), is the largest light rare earth element (LREE) deposit in the world (Supplementary Figure S1 and Table S1), the largest niobium (Nb) and thorium (Th) deposit in China, and a polyphase model involving multiple periods of alkaline magmatism, metamorphism and deformation and potentially subsequent infiltration of Caledonian-age fluids derived from subduction-related granitoids.3a, b), which is within the compositional range of the upper continental crust (−0.52 to 0.92‰, average −0.22‰)Mg values ranging from −0.195 ± 0.061‰ to −0.458 ± 0.073‰, which plot within the field of ore body values.Most of the Mg isotopic compositions of the ore bodies can be explained by mixing between mantle-derived material (−0.25 ± 0.07‰) and calcitic carbonatite, with or without the involvement of upper continental crust (Fig. Several calcitic samples from the same carbonatite dykes plot in the ferro-carbonatite and magnesio-carbonatite fields on the carbonatite classification plot Mg values of the calcitic carbonatite dykes range from −2.277 ± 0.083‰ to 0.225 ± 0.061‰, distinct from the compositions of the ore bodies and dolomitic carbonatite dykes.The analyses show that the dolomitic carbonatite dykes have major and trace element compositions that are essentially the same as those of the ore bodies. Key element ratios such as Th/U, Nb/U, Th/Nb and Ce/Lu also demonstrate that the REE ore bodies have a closer affinity to the dolomitic carbonatites than to the calcitic carbonatites (Fig. Dolomite dykes have a close affinity to the REE ore bodies, both of which have systematically higher Fe and Mg than the calcitic carbonatite samples.
In contrast, the calcitic carbonatites have lower Ce/La and Th/U than the other two types of carbonates, at the same Ce and Th contents, respectively. Mg values for the Bayan Obo ore bodies range from −0.671 ± 0.060‰ to 0.283 ± 0.073‰ (Supplementary Table S3, Fig.The Bayan Obo giant REE-Nb-Fe deposit is located at the north margin of the North China Craton, close to the suture between the North China Craton and the Central Asian Orogenic Belt. Major and trace element compositions of carbonatites and ore-bearing dolomite are listed in Supplementary Table S2.