Through 1:50,000 regional geological survey, two mantle peridotite blocks were identified within the Zhuyangguan-Xiaguan Fault Zone. These blocks occur as lensoidal bodies concordant with the tectonic schistosity, hosted within a biotite-quartz schist matrix, and are in fault contact relationships with the surrounding rocks. The core of the blocks is dominated by metamorphic peridotite, with serpentinization alteration intensifying towards the margins, gradationally passing into serpentinite. Geochemically, the rocks are characterized by high MgO, Cr, and Ni contents, relatively low FeOT^, TiO?, Yb, and rare earth element (REE) contents, and Mg/Si ratios(1.18 to 1.29). They exhibit an LREE-enriched, flat REE distribution pattern, enrichment in Cs, Th, U, Pb, and Sr, and depletion in Zr, Hf, Ti, and P. These characteristics are diagnostic of mantle peridotites within supra-subduction zone (SSZ) type ophiolites. Integrating previous research findings, the metamorphic peridotite blocks within this fault zone, together with the newly identified metamorphic pyroxenite blocks, metamorphic gabbro blocks, metamorphosed siliceous rock blocks, and the albite-actinolite schist matrix recognized in this survey, collectively potentially constitute an ophiolite sequence. These relationships suggest that the Zhuyangguan-Xiaguan Fault Zone may represent an Early Paleozoic ophiolitic tectonic mélange belt.