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The Tongcheng ultrapotassic rocks intrude in Mesoproterozoic limestones in Chongxin County, Gansu Province, China, at the south‐western margin of the Ordos Block. They are characterized by high K2O and Al2O3 but low SiO2, FeOT, MgO, and CaO. The ultrapotassic rocks are relatively depleted in Nb, Ta, Ti, Zr, and Hf and enriched in the large‐ion lithophile elements Rb, Ba, and Th. Zircons from the ultrapotassic...
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