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The Taihua Complex in the Xiong'er area along the southern segment of the Trans-North China Orogen (TNCO) consists of gray gneisses with minor amphibolites. Zircon U–Pb dating of the gray gneisses reveals at least two episodes of Early Paleoproterozoic magmatism (2.30–2.32Ga and 2.07–2.19Ga), each with distinct geochemical features. The Tieluping TTG gneisses of the early suite have very low HREE...
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