Late Mesozoic granitoids of the Dalat zone are of sub-alkaline affinity, belong to the high-K calc-alkaline series and display features typical of I-type granites. The Dinhquan suite consists of hornblende-biotite granodiorites, diorites, and minor granites emplaced at ∼110 My. These rocks have relatively low initial 87Sr/ 86Sr ratios (0.7049–0.7061) and moderate ε Nd(T) values (−0.8 to −2.0). Chondrite-normalized REE patterns are fractionated and have small negative Eu anomalies (Eu/Eu*=0.55–0.97). All these characteristics, combined with low Al 2O 3/(FeO+MgO+TiO 2) and (Na 2O+K 2O)/(FeO+MgO+TiO 2) ratios and high Mg# values, suggest an origin through dehydration melting of alkaline mafic lower crustal source rocks. The Cana suite contains biotite-bearing granites poor in hornblende. The rocks are 96–93 My old in age, having higher initial 87Sr/ 86Sr ratios (0.7060–0.7064) and nearly constant ε Nd(T) (−2.5 to−2.7) values. These characteristics, in conjunction with the chemical signatures and old T DM model ages, indicate that crustal material played a very important role in their petrogenesis. The granites are further characterized by strong negative Eu anomalies (Eu/Eu*=0.04–0.39) and Sr, suggesting melting with residual plagioclase and/or a high degree of fractional crystallization. The Deoca suite is made up of 92–88 My old pink porphyritic hornblende-biotite-bearing granodiorites, monzogranites and diorites. Initial isotopic compositions ( 87Sr/ 86Sr=0.7055–0.7069; ε Nd(T)=+0.9 to −3.3) and chemical features suggest derivation by dehydration melting of heterogeneous metagreywacke-type sources with additional input of mantle-derived material. Furthermore, the Deoca rocks have concave-upward REE patterns indicating that amphibole played a dominant and garnet an insignificant role during magma segregation.