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Sutures mark places where oceans have closed and two once widely separated terranes have collided.Sutures are defined on the basis of geological relationships,and differences in the geologic,structural,magmatic,sedimentary,and metamorphic histories of the terranes on either side of the suture.Sutures are characterized by complex structures and rock units such as mélanges and ophioltes that were scraped off the intervening oceanic substratum during convergence and collision of the two terranes.The North China craton(NCC)is divided into two major blocks and several minor terranes,yet positions and ages of sutures between the Eastern and Western blocks within the Central orogenic belt(COB)have been controversial.The Zanhuang massif is located in the south-central COB along its border with the eastern block of the NCC.