limited enrichment
1.All rocks are characterized with the LREE enrichment, HFSE depletion, absence of Nb and Ta negative anomalies, and existence of P and K negative anomalies. The limited variation of some ratios of incompatible elements, such as La/Ta, La/Sm, (La/Nb)PM , (Th/Ta)PM ,show that these rocks were genetically linked with mantle plume activity, without or with little lithospheric or crustal contamination during the process of magma ascent en route to surface.
