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A large part of the accreted Middle to Late Triassic Wrangellia oceanic plateau is exposed as a linear belt (<30 km×300 km) in southwest Yukon. The first major- and trace-element, and isotopic compositions of the Nikolai Formation in Yukon are presented here, along with compositions for underlying Paleozoic arc rocks. The Nikolai Formation in Yukon is predominantly massive tholeiitic subaerial...