摘要
The Nagaland–Manipur Hill ophiolite belt in NE India represents the southern extension of the Neotethyan Yarlung-Zhangbo suture zone in Southern Tibet,and connects this on-land exposure of the late Mesozoic collision front in the north with a modern trench-arc system in the Andaman Sea region in the south.Ophiolitic subunits in the Nagaland–Manipur Hill area in the Indo-Myanmar Ranges occur as blocks or thrust sheets within a mélange with a serpentinite or fine-grained greywacke matrix,and are spatially associated with eclogitic and blueschist rock assemblages.This ophiolitic mélange zone is tectonically sandwiched between an older(Triassic–Cretaceous)accretionary prism complex(Nimi Flysch)to the east and a younger(Late Cretaceous–Miocene)accretionary wedge(Disang Flysch)to the west.The Nagaland–Manipur Hill ophiolitic mélange is thus part of a progressively westward migrated subduction-accretion complex,and it represents a typical subduction channel mélange evolved during the fast subduction of the Neotethyan oceanic lithosphere beneath Asia–Sundaland.
