海南岛抱板群变质基性火山岩的岩石学、地球化学、Sr、Nd、Pb同位素及其形成的大地构造环境的综合研究表明 ,抱板群变质基性火山岩具有洋中脊型拉斑玄武岩和岛弧型拉斑玄武岩的双重特征 ,起源于亏损地幔 ,是古俯冲消减带上部岩石圈地幔楔、自消减带卷入地幔楔地壳物质及俯冲洋壳析出的流体构成的三元混合物部分熔融结果 ,产生于扩张弧后 (或弧间 )盆地环境。地球动力学分析表明 ,古中元古代时 ,海南岛西部可能经历了一次由“开”向“合”转变的构造演化史。 The comprehensive study on the petrology, geochemistry, Sr, Nd, Pb isotopes of the metamorphic basement volcanic rocks in the Baopan Group, Hainan Island, and the tectonic setting of the tectonic setting has shown that the metamorphic base volcanic rocks in the Baopan Group have mid-oceanic ridge- The dual characteristics of island arc tholeiite basalts originate from the depleted mantle, which is the partial melting result of the ternary mixture formed by the lithospheric mantle wedge of the upper subduction zone, the fluid from the depleted zone mantle wedge crust and the subducted oceanic crust , Resulting from the expansion arc (or arc) basin environment. Geodynamic analysis shows that during the Palezoic Mesoproterozoic, the western part of Hainan Island may have undergone a tectonic evolution from the “open” to the “closed”.