Geochemical and radiogenic isotopic signatures of granitic rocks in Chanthaburi and Chachoengsao provinces, southeastern Thailand: Implications for origin and evolution

•Geochemical and isotopic signatures of five granitic bodies in SE Thailand were investigated.•The granitic rocks are classified as I- to A-type and ilmenite series with negative Eu anomalies.•Zircon U-Pb dating yields ages of 208–214 Ma except for one granitic body (55 Ma).•Nd-Sr isotopes suggest continental crust material had a strong influence on the granitic bodies.•The study area is concluded to belong to the Sukhothai zone as well as SW Cambodia.