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胶南王台变质基性熔岩的地球化学特征表现为拉班玄武岩系列 ,具平坦型稀土配分模式 ,高强场相容元素含量与N MORB相近 ,εNd(t) =1.82～ 6 .35 ,△2 0 7Pb 2 0 4Pb为 - 6 .748～ - 8.0 0 0 ,形成于洋中脊环境。它的存在表明鲁东地区发育有元古宙古洋壳残片 ,华北古陆块南缘在早 中元古宙似应处于大洋环境
The geochemical characteristics of the Jiaonan Wangtai metamorphic basement lava are Laban basalt series with flat REE patterns. The content of compatible elements in high-strength field is similar to that of N MORB with εNd (t) = 1.82-6.35 and △ 20 7Pb 2 0 4Pb is -6.748 ~ -8.0 0 0, formed in mid-ocean ridge environment. Its existence indicates that the Proterozoic paleo-oceanic crust was developed in Ludong area. The southern margin of North China ancient terrane should be in the ocean environment in the early Middle Proterozoic