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Subduction polarity and collisional process are still controversial in the eastern Palaeo‐Tethys. On the basis of 1:50,000‐scale geological mapping at the Heni Township, zircon U–Pb geochronology and whole‐rock geochemistry were analysed for volcano‐sedimentary rocks in the eastern Yidun Micro‐block, Qinghai‐Tibet Plateau. Early Palaeozoic sequences were reported firstly in the eastern Yidun Micro‐block...