Comparison of eastern paleo-Tethyan ophiolites and its geodynamic significance

Nd-Pb isotopic geochemistry of metabasalt from Dur’ngoi ophiolite, Qinghai Province, NW China reveals the presence of DMM mixing with EMII components in its upper mantle source, which is comparable with present Indian MORB. Comparisons indicate that the geochemistry, chronology and source characteristics of Dur’ngoi ophiolite coincide with Paleo-tethyan ophiolites from “Sanjiang” area. Together with evidences from regional geology in adjacent areas, this study proves that independent paleo-tethyan basins evolved contemporarily, the dynamics of which is attributed to the interaction of mantle plume with over-riding lithosphere.