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Decade-long investigation of the Yarlung Zangbo Suture Zone(YZSZ),southern Tibet,has revealed its high complexity in terms of structure,geochronology and metamorphic and igneous histories.For instance,YZSZ comprises rocks as old as Late Devonian to rocks as young as mid-Miocene,metamorphic intensities vary from high-grade to very-low grade and deformation styles range from ductile to brittle.Late Devonian rocks(363.7 ± 1.7 Ma)are alkalic gabbros resulting from activity of a plume active within the Paleo-Tethys basin.The Permian and Triassic rocks are made of metamorphosed limestone associated with radiolarite showing affinities with Indian continental margin and deep Tethyan ocean floor,respectively.Some new findings might bring questions concerning these issues.