This study carried out detailed field mapping and indoor analysis of the Hoboksar ophiolitic mélange in northern West Junggar, which was poorly reported. The ophiolitic mélange with an area of about 4 km2 consists of serpentinized peridotite, pyroxenite, gabbro, dolerite, basalt, chert, marble and andesitic volcanic clastic rocks. 〖JP2〗Matrix consists mainly of serpentinized peridotite; the other components occur as faulting blocks or fragments and exhibit irregular fault contact with the matrix, being typical of contact relation of fragments enclosed by the matrix. Wall rocks, matrix and fragments have undergone various degrees of deformation and alteration, with foliation well developed within wall rocks and matrix. Geochemical analysis shows that the gabbro fragments of the Ho〖JP〗boksar ophiolitic mélange have slight fractionation between LREE and HREE, with (La/Yb)N of 048~065 and negligible Eu anomalies. HFSE (Zr~Lu) shows no fractionation and is characteristic of near MORB, suggesting the Hoboksar ophiolitic mélange belongs to MOR type. LAICPMS UPb dating of zircons from the gabbro blocks yields an age of 484±3 Ma, indicating that the ancient oceanic crust was developed in the Early Ordovician. New determination of time and attributes of the Hoboksar ophiolite mélange not only implies the at least one ancient ocean occurring between BoshchekulChingiz arc and ZharmaSaur arc in the early Ordovician, but also provides an important clue for study of tectonic evolution of northern West Jungger. The Hoboksar ophiolitic mélange correlates well with the reported Kujibai and Hongguleleng ophiolitic mélanges in northern West Junggar, but is different from the Qagan Tolgoi ophiolitic mélange in many aspects. Therefore, this study provides new constraints on the determination of the tectonic suture belt in West Junggar.