Abstract: Detailed Large- scale lithofacies and structure field mapping and systematic test analysis reveals the Wudang Mountain is not unified Precambrian basement composition in South Qinling Orogeny, a suit of Mesozoic mélange were identified and determined in Huanglong—Fangtan and Yindongshan of Danjiangkou regions, which are located in between Shiyan and Liangyun faults. To further carry out the research on the mélange composition and their genesis directly affect the understanding of the Wudang Mountain orogeny and evolution. This study focuses on the genesis and epoch of the basalt block form Huanglong—Fangtan mélange. Whole rock geochemistry of these basalt blocks indicates they are subalkaline tholeiitic series with typically characterized by middle concentrations of Ti, Zr, Hf, and Nd and Enriched midocean ridge basalt (E- MORB)- like rare earth element distribution patterns, trace element spider diagrams. In addition, the samples appear to have all originated from the lowpressure and high degree of partial melting of spinel lherzolite and undergone the affected by enrichment of the mantle or subduction, ultimately resulting in an enrichment of highfield incompatible elements provenance. Zircon U- Pb dating of basalts indicates a Middle Permian magmatic age. Most importantly, in combination with its regional geological characteristics and petrogenesis, the E- MORB type basalt blocks are constrained to a midocean ridge or seamount environment. Thus, an ocean basin exists in Shiyan area Wudang Mountain on Mid—Late Permian, which provides the basic information for reunderstanding the origin of Huanglong—Fangtan mélange and the tectonic attribute of the Phanerozoic in South Qinling Orogeny.