Petrogenesis of the Eonyang granitoids, SE Korea: new SHRIMP-RG zircon U–Pb age and whole-rock geochemical data

Petrogenesis of the Late Cretaceous Eonyang granitoids in the Gyeongsang Basin is considered in terms of field relations, petrography, geochemistry, Sr–Nd isotopes, and sensitive high-resolution ion microprobe-reverse geometry (SHRIMP-RG) geochronology. The plutons can be divided into two groups: Group I consists of quartz-monzodiorite (QMD), granodiorite (GD), enclave-rich porphyritic granite (ERPG), and enclave-poor porphyritic granite (EPPG), showing evidence of magma mixing/mingling. Group II comprises coarse-grained porphyritic granite (CPG), fine-grained micrographic granite (FMG), and equigranular granite (EG), displaying non-mixing and highly differentiated characteristics. The age of the EPPG, reflecting magma mixing, is 73.3 ± 2.0 Ma. The Eonyang granitoids show subalkaline, calc-alkaline, I-type, and high-K characteristics except for the mafic magmatic/microgranular enclaves (MMEs), which have medium-K calc-alkaline compositions. The mafic facies (QMD + GD + MME) are metaluminous, whereas the f...