OIB和OceanicPlateau,两者都是地幔柱引起的,有什么不同?OIB OIB’s are range from olivine tholeiites to highly alkaline basalts with relatively high TiO2, Na2O, K2O, and P2O5. All incompatible trace elements (LREE, K, Rb, Cs, Ba, Pb, Sr, Th, U, Ce, Zr, Hf, Nb, Ta, and Ti) are enriched in OIB magmas with respect to MORBs. HREE elements are depleted indicating deep melting within the garnet stability field ( 70-80 depth). Sr and Nd isotope ratios are relatively enriched with respect to MORBs indicating undepleted (primitive) and/or enriched mantle source components. 查看更多