洪古勒楞蛇绿岩Sm Nd的等时线年龄为 ( 6 2 6± 2 5 )Ma ,εNd(t) =8.40 ,模式年龄TNdDM值界于 ( 1 1 80～ 1 2 0 8)Ma之间 ,说明该蛇绿岩形成于晚震旦晚期 .岩相组合、岩石化学、稀土配分、微量元素以及铬铁矿的伴生等特征进一步表明 ,洪古勒楞蛇绿岩的岩浆来源于轻稀土富集的自亏损地幔源区 ,并形成于古大洋中脊 ,现存为碰撞带中的洋壳残片 . The isochron age of Sm Nd of Honggulleng ophiolite is (6 2 6 ± 2 5) Ma, εNd (t) = 8.40, and the model age TNdDM value is in the range of (1180 ~ 1280 Ma) , Indicating that the ophiolite was formed in late Late Sinian.The characteristics of lithofacies assemblages, petrochemistry, rare earth complexes, trace elements and chromite associations further indicate that the magmas of the Honggulleng ophiolite are derived from light rare earths The enriched self-depleted mantle source zone was formed in the paleoceanic ridges and survived as crustal fragments in the collision zone.